Software - BitcoinWiki

LPT: Garlicoin is based off Litecoin which is based off Bitcoin. If you're having trouble using the Garlicoin command line, you can usually use the same commands as for the original Bitcoin client

submitted by GarlicoinAccount to garlicoin [link] [comments]

12.7 PATCH NOTES

Dear Escapers!
We are glad to present you the preliminary patch notes for the 0.12.7 patch!
---
Added:
---
• Customs expansion (expansion of industrial area, construction site, added many new explorable buildings, stationary weapons, new location for Reshala spawn etc.)
• Added new scav boss - Sanitar.
A former doctor, he worked in the health resort "Lazurny bereg", and before that in the TerraGroup laboratory. After the events that happened in Tarkov, he gathered a gang with former colleagues and operates on the "Shoreline". Actively uses professional skills in combat, quickly healing himself and the gang members. He uses various stimulants and medications, including those of his own production. He can quickly perform surgery by pulling out a bullet or applying a tourniquet on the field. Sometimes he is loyal to the Scavs and can leave a couple of first-aid kits or other medical supplies for his own group members on location
• New quests on Shoreline
• System for reporting suspicious players, unacceptable nicknames and game bugs abusers (on the post-match screen)
Improved AI behavior:
• Bots can pick up items now
• Improved AI behavior when they see bodies
• Bots now can pick up a second firearm from bodies
• AI now can greet each other or player scavs, showing their peaceful intentions
• Bots will eat\drink while in peaceful mode
• AI will perform a mag check when in peaceful mode
• Bots can check someone for friend or foe by aiming at him for some time, if they’re not sure of one’s intentions
• Bots will sprint while patrolling if they consider the spot being dangerous
• AI will be able to storm the player as a group, if he’s holding position and attacking them
• AI will try to avoid dangerous places
---
New weapons:
---
• FN GL40 Grenade launcher
• Mossberg 590A1 Shotgun
---
New ammo:
---
• .366 AP-M
• .45 ACP Hydr-Shock
• 9x19 mm QuakeMaker
• 9x19 mm 7N31
• .45 ACP Lasermatch FMJ
• .45 ACP AP
• 7.62x51 mm M993
• 40x46 мм M381 HE
• 40x46 мм M386 HE
• 40x46 мм M406 HE
• 40x46 мм M433 HEDP
• 40x46 мм M441 HE
• 40x46 мм M576 buckshot
---
Added new stimulants:
---
• 3-(b-TG)
• L1 (Noradrenaline)
• P22 (Specimen 22)
• AHF1-M
• Meldonin
• "Obdolbos" cocktail
• M.U.L.E
• Added an additional icon for the network connection status in case of high packet loss
• In the container slots window, the container tag is now displayed in the header
---
Iteration of improving and reworking the skill system:
---
New skill "Surgery"
• Reduces HP penalty for surgery
• Improved surgery speed
• (Elite) No HP penalty for the restored body part
• (Elite) Maximum increase in the speed of surgery
New skill "Aim drills"
• Increase of the aiming speed
• Decrease the volume of aiming
• (Elite) No hand shaking at any stamina value, first 2 seconds after aiming
• (Elite) Reduced hands shaking during tremor and fracture, the first 2 seconds after aiming
Rework of the “Strength” skill
• Increase all weight limits
• Increase the speed of the sprint
• Increase the jump height
• Increase the strength of the grenade throw
• Increase the strength of a melee attack
• (Elite) The weight does not take into account the weapons on the sling and on the back
• (Elite) Melee attack can be stronger than usual
Rework of the "Endurance" skill
• Increased feet stamina
• Reduced stamina consumption for jumping
• Increased holding breath time when ads
• Increased the speed of breath recovery
• (Elite) Maximum increase in breathing recovery rate
• (Elite) Breathing is no longer dependent on energy
• (Elite) Increased stamina reserve
Various fixes in old skills
• Added 5 HP to the health of “Chest” zone (from 80 to 85)
---
Optimization:
---
• Optimized the rendering of decals
• Fixed freezes that happened when the sound of thunder or the sound of grenades exploding was played
• Optimized the performance of the game server
• Fixed an issue with killing the boss of a group of raiders who appeared on the scene after interacting with the trigger was leading to errors on the server
• Minor optimizations on the first shot or hit
• Optimization of hideout sounds
• Fixes of errors that could potentially lead to different freezes
---
Fixed:
---
• Iteration of fixes and corrections in UI
• Bug with the PostFX menu that remains on the screen after closing the settings
• Bug playing the sound of contusion if the sound is turned off in the settings
• Bug of jerky animation of shooting weapons in the Hideout shooting range
• The passage of raiders on the laboratory through the doors
• A bug that allowed you to quickly move when constantly tapping the "Run" button when overweight
• AS VAL with the handle adapter "Rotor 43" is now impossible to fold
• Inability to exit the location via the paid exit “Car”, if you reconnect at the start of the exfil timer
• Bug with throwing away the magazine when reloading the weapon via the context menu
• Error 228 when receiving items from an expired email
• Formulas for calculating prices for items with its resource and its commissions
• After the reconnect, the equipment that was not searched become searched
• The sound of the visor on/off remained at one point, and does not follow the character
• Bug that wouldn't block buttons on the bottom panel after reconnecting as a Scav
• Interface block if you go to the “Map” screen without a map
• Bug when the "Receive all" button opened only the first and last message with items
• Various bugs with switching the sound from “outdoor " to "indoor", and back, when reconnecting
• Bug of not blocking an item after it was added to the merchant's sales table
• Cartridges from packs of cartridges found in raid now have the status " found in the raid”
• Error when studying items from the scav box
• Fixes in the flea Market
• The search will be updated if you delete and add an item to the wish list
• Loss of a player's nickname and rating from the offer line after applying filters
• The “search by item" option now resets the selected filters
• Bug displaying the loading spinner on top of the list of offers
• The mount without the “Found in raid" label ceased to be semitransparent (blocked) in the selection of the item for the offer, if you put and remove the mod on it
• Bug when the merchant's avatar was flattened
• Incorrect tag behavior on marked items for a flea market offer if you select multiple items from the container, closing and opening the container
• Horizontal scrollbar on the product sales screen
• Bug when the player couldn't put 2 identical weapons on the flea market if one of them was included in the starter kit for pre-order
• Error 1508 - You send bad items- when putting an empty pack of cartridges on a flea Market
• Bug, when for buying through a flea market goods from npc merchants needed items found in raid
Fixed in weapon presets
• Displaying the indicator “you have mods to build” when there are no mods for the build in the stash
• Bug when the build could have been built with the wrong mod that was not in the preset
• Weapon disassembly bug if you build the same preset twice with the same weapon
• Ability to select items that are blocked for purchase, via the presets by clicking the button “Select all”
• Packs of items are no longer displayed in the purchase lists of preset mods
• The purchase lists of presets no longer display items the player's own offers
• Added an error about lack of space when purchasing preset mods
• Bug when opening presets through the lower panel that caused the game client to freeze
Fixed in the hideout
• Various fixes in the bitcoin farm
• White authorization screen if you improve the pre-order version while in the hideout
• Bug when it was possible to install a filter with zero resource in the “Water collector” and it could not be uninstalled
• Calculation of fuel consumption time in the “Generator " zone
• Bug duplicating the canister icon, when selecting a canister, in the “Generator" zone
• Various bugs in group chat
• Bugs with the discharge of weapons in the stash
• Incorrect position of the fire mod pin and the turn of the barrel of the PPSH
• Visual bug for displaying a zero bonus in the base level zones in the Hideout
• Visual bug with the availability of time selection before the raid on the Laboratory screen
• A bug where the player could spawn outside the location
• Spamming error NullReferenceException: MuzzleManager
• An error that occurs every time after treatment or getting a fracture
• "Failed to create device file" error that occurs during client downtime
• Errors when assigning voice commands
• Spamming error when a large number of bots are active in the offline mode
• Various errors while loading in raid
• Various bugs and issues with Customs location
• Various bugs and improvements related to AI
• Fixed a bug when bots didn't follow a grenade throw with a voiceline
• Fixed a handful of bugs related to bots getting stuck
• Fixed a bug where a Gluhar would not react to a killed in the head ally
• Fixed a bug when bots tried to heal a blacked out body part
• Bots are now able to treat debuffs on blacked out body parts again
• Fixed a handful of bugs with bots knocking out doors
• Other AI related bug fixes and improvements
• Various localization fixes and improvements
• Other minor bugs and issues
---
Changed:
---
• Now it is possible to examine items from the construction requirements screen in the Hideout
• Added displaying the time before the bleeding effect disappears in the stash
• Now if you are not matched to the raid within 45 minutes, the search will be canceled
• Updated SV-98 animation, hold, new animations when entering and exiting a sprint, new hold in the menu and on the loading screen
• Updated PPSH animation, hold, and new animations when entering and exiting a sprint
submitted by lordwerneo to EscapefromTarkov [link] [comments]

What does "bin/bitcoin-wallet" and other binaries do?

I'm old, and haven't run Bitcoin Core since the 80's, when it was just bitcoind and bitcon-qt.
Can someone tell me what these files are and what they do, because a) they're not mentioned in the readme.md, and b) Google is absolutely useless for searches like "bin/bitcoin-wallet", returning patronising results like "What is a bitcoin wallet?"
bin/bitcoin-cli // command-line bitcoin client bin/bitcoind // bitcoin daemon bin/bitcoin-qt // gui client bin/bitcoin-tx // ?? bin/bitcoin-wallet // ?????? 
Thanks.
submitted by textreply to Bitcoin [link] [comments]

Patch Notes Thread

Dear Escapers!
We are glad to present you the preliminary patch notes for the 0.12.7 patch!
Added:
• Customs expansion (expansion of industrial area, construction site, added many new explorable buildings, stationary weapons, new location for Reshala spawn etc.)
• Added new scav boss - Sanitar.
A former doctor, he worked in the health resort "Lazurny bereg", and before that in the TerraGroup laboratory. After the events that happened in Tarkov, he gathered a gang with former colleagues and operates on the "Shoreline". Actively uses professional skills in combat, quickly healing himself and the gang members. He uses various stimulants and medications, including those of his own production. He can quickly perform surgery by pulling out a bullet or applying a tourniquet on the field. Sometimes he is loyal to the Scavs and can leave a couple of first-aid kits or other medical supplies for his own group members on location
• New quests on Shoreline
• System for reporting suspicious players, unacceptable nicknames and game bugs abusers (on the post-match screen)
Improved AI behavior:
• Bots can pick up items now
• Improved AI behavior when they see bodies
• Bots now can pick up a second firearm from bodies
• AI now can greet each other or player scavs, showing their peaceful intentions
• Bots will eat\drink while in peaceful mode
• AI will perform a mag check when in peaceful mode
• Bots can check someone for friend or foe by aiming at him for some time, if they’re not sure of one’s intentions
• Bots will sprint while patrolling if they consider the spot being dangerous
• AI will be able to storm the player as a group, if he’s holding position and attacking them
• AI will try to avoid dangerous places
New weapons:
• FN GL40 Grenade launcher
• Mossberg 590A1 Shotgun
New ammo:
• .366 AP-M
• .45 ACP Hydr-Shock
• 9x19 mm QuakeMaker
• 9x19 mm 7N31
• .45 ACP Lasermatch FMJ
• .45 ACP AP
• 7.62x51 mm M993
• 40x46 мм M381 HE
• 40x46 мм M386 HE
• 40x46 мм M406 HE
• 40x46 мм M433 HEDP
• 40x46 мм M441 HE
• 40x46 мм M576 buckshot
Added new stimulants:
• 3-(b-TG)
• L1 (Noradrenaline)
• P22 (Specimen 22)
• AHF1-M
• Meldonin
• "Obdolbos" cocktail
• M.U.L.E
• Added an additional icon for the network connection status in case of high packet loss
• In the container slots window, the container tag is now displayed in the header
Iteration of improving and reworking the skill system:
New skill "Surgery"
• Reduces HP penalty for surgery
• Improved surgery speed
• (Elite) No HP penalty for the restored body part
• (Elite) Maximum increase in the speed of surgery
New skill "Aim drills"
• Increase of the aiming speed
• Decrease the volume of aiming
• (Elite) No hand shaking at any stamina value, first 2 seconds after aiming
• (Elite) Reduced hands shaking during tremor and fracture, the first 2 seconds after aiming
Rework of the “Strength” skill
• Increase all weight limits
• Increase the speed of the sprint
• Increase the jump height
• Increase the strength of the grenade throw
• Increase the strength of a melee attack
• (Elite) The weight does not take into account the weapons on the sling and on the back
• (Elite) Melee attack can be stronger than usual
Rework of the "Endurance" skill
• Increased feet stamina
• Reduced stamina consumption for jumping
• Increased holding breath time when ads
• Increased the speed of breath recovery
• (Elite) Maximum increase in breathing recovery rate
• (Elite) Breathing is no longer dependent on energy
• (Elite) Increased stamina reserve
Various fixes in old skills
• Added 5 HP to the health of “Chest” zone (from 80 to 85)
Optimization:
• Optimized the rendering of decals
• Fixed freezes that happened when the sound of thunder or the sound of grenades exploding was played
• Optimized the performance of the game server
• Fixed an issue with killing the boss of a group of raiders who appeared on the scene after interacting with the trigger was leading to errors on the server
• Minor optimizations on the first shot or hit
• Optimization of hideout sounds
• Fixes of errors that could potentially lead to different freezes
Fixed:
• Iteration of fixes and corrections in UI
• Bug with the PostFX menu that remains on the screen after closing the settings
• Bug playing the sound of contusion if the sound is turned off in the settings
• Bug of jerky animation of shooting weapons in the Hideout shooting range
• The passage of raiders on the laboratory through the doors
• A bug that allowed you to quickly move when constantly tapping the "Run" button when overweight
• AS VAL with the handle adapter "Rotor 43" is now impossible to fold
• Inability to exit the location via the paid exit “Car”, if you reconnect at the start of the exfil timer
• Bug with throwing away the magazine when reloading the weapon via the context menu
• Error 228 when receiving items from an expired email
• Formulas for calculating prices for items with its resource and its commissions
• After the reconnect, the equipment that was not searched become searched
• The sound of the visor on/off remained at one point, and does not follow the character
• Bug that wouldn't block buttons on the bottom panel after reconnecting as a Scav
• Interface block if you go to the “Map” screen without a map
• Bug when the "Receive all" button opened only the first and last message with items
• Various bugs with switching the sound from “outdoor " to "indoor", and back, when reconnecting
• Bug of not blocking an item after it was added to the merchant's sales table
• Cartridges from packs of cartridges found in raid now have the status " found in the raid”
• Error when studying items from the scav box
• Fixes in the flea Market
• The search will be updated if you delete and add an item to the wish list
• Loss of a player's nickname and rating from the offer line after applying filters
• The “search by item" option now resets the selected filters
• Bug displaying the loading spinner on top of the list of offers
• The mount without the “Found in raid" label ceased to be semitransparent (blocked) in the selection of the item for the offer, if you put and remove the mod on it
• Bug when the merchant's avatar was flattened
• Incorrect tag behavior on marked items for a flea market offer if you select multiple items from the container, closing and opening the container
• Horizontal scrollbar on the product sales screen
• Bug when the player couldn't put 2 identical weapons on the flea market if one of them was included in the starter kit for pre-order
• Error 1508 - You send bad items- when putting an empty pack of cartridges on a flea Market
• Bug, when for buying through a flea market goods from npc merchants needed items found in raid
Fixed in weapon presets
• Displaying the indicator “you have mods to build” when there are no mods for the build in the stash
• Bug when the build could have been built with the wrong mod that was not in the preset
• Weapon disassembly bug if you build the same preset twice with the same weapon
• Ability to select items that are blocked for purchase, via the presets by clicking the button “Select all”
• Packs of items are no longer displayed in the purchase lists of preset mods
• The purchase lists of presets no longer display items the player's own offers
• Added an error about lack of space when purchasing preset mods
• Bug when opening presets through the lower panel that caused the game client to freeze
Fixed in the hideout
• Various fixes in the bitcoin farm
• White authorization screen if you improve the pre-order version while in the hideout
• Bug when it was possible to install a filter with zero resource in the “Water collector” and it could not be uninstalled
• Calculation of fuel consumption time in the “Generator " zone
• Bug duplicating the canister icon, when selecting a canister, in the “Generator" zone
• Various bugs in group chat
• Bugs with the discharge of weapons in the stash
• Incorrect position of the fire mod pin and the turn of the barrel of the PPSH
• Visual bug for displaying a zero bonus in the base level zones in the Hideout
• Visual bug with the availability of time selection before the raid on the Laboratory screen
• A bug where the player could spawn outside the location
• Spamming error NullReferenceException: MuzzleManager
• An error that occurs every time after treatment or getting a fracture
• "Failed to create device file" error that occurs during client downtime
• Errors when assigning voice commands
• Spamming error when a large number of bots are active in the offline mode
• Various errors while loading in raid
• Various bugs and issues with Customs location
• Various bugs and improvements related to AI
• Fixed a bug when bots didn't follow a grenade throw with a voiceline
• Fixed a handful of bugs related to bots getting stuck
• Fixed a bug where a Gluhar would not react to a killed in the head ally
• Fixed a bug when bots tried to heal a blacked out body part
• Bots are now able to treat debuffs on blacked out body parts again
• Fixed a handful of bugs with bots knocking out doors
• Other AI related bug fixes and improvements
• Various localization fixes and improvements
• Other minor bugs and issues
Changed:
• Now it is possible to examine items from the construction requirements screen in the Hideout
• Added displaying the time before the bleeding effect disappears in the stash
• Now if you are not matched to the raid within 45 minutes, the search will be canceled
• Updated SV-98 animation, hold, new animations when entering and exiting a sprint, new hold in the menu and on the loading screen
• Updated PPSH animation, hold, and new animations when entering and exiting a sprint
submitted by MiNNOCENTWORKACCOUNT to TheScavLands [link] [comments]

Binance Number ☏ ⁺𝟏𝟖𝟒𝟒-𝟗𝟎𝟕-𝟎𝟓𝟖𝟑 || Binance SUPPORT NUMBER Wallet Exchange Bitcoin sell buy

Binance Number ☏ ⁺𝟏𝟖𝟒𝟒-𝟗𝟎𝟕-𝟎𝟓𝟖𝟑 || Binance SUPPORT NUMBER Wallet Exchange Bitcoin sell buy
Binance US Helpline Number {𝟭-𝟖𝟒𝟒~ 𝟗𝟎𝟕~ 𝟎𝟓𝟖𝟑 } TOLLFREE Customer service.Binance US Helpline Number {𝟭-𝟖𝟒𝟒~ 𝟗𝟎𝟕~ 𝟎𝟓𝟖𝟑 } TOLLFREE Customer service for online wallet issue solution ,contact us now we are here for quick.ψ Password Recovery Reset Binance, earlier referred to as America on-line is one in all the biggest net access subscription services that provide a spread of net services for its users. It created a special place within the lives of individuals through its buddy lists and instant electronic messaging services. With starting its journey as control Video Corporation in 1983, Binanceunbroken on increasing its roots with a lot of and additional services. It fell down; it rose, however with the conviction of staying within the lives of its valuable users.
Binance Customer Service Number setup accounts ¥ 𝟏=𝟖𝟒𝟒☥𝟗𝟎𝟕☥𝟎𝟓𝟖𝟑ψ Password Recovery Reset Binance, earlier referred to as America on-line is one in all the biggest net access subscription services that provide a spread of net services for its users. It created a special place within the lives of individuals through its buddy lists and instant electronic messaging services. With starting its journey as control Video Corporation in 1983, Binanceunbroken on increasing its roots with a lot of and additional services. It fell down; it rose, however with the conviction of staying within the lives of its valuable users.
Ang Binance Customer Service Number na mga account ng ¥ 𝟏 = 𝟖𝟒𝟒☥𝟗𝟎𝟕☥𝟎𝟓𝟖𝟑ψ Pag-reset ng Password sa Pag-reset ng Password, na naunang tinukoy bilang on-line na America ay isa sa lahat ng mga pinakamalaking serbisyo sa pag-access sa net access na nagbibigay ng pagkalat ng mga serbisyo ng net para sa mga gumagamit nito. Lumikha ito ng isang espesyal na lugar sa loob ng buhay ng mga indibidwal sa pamamagitan ng mga listahan ng buddy at mga instant na serbisyo sa pagmemensahe. Sa pagsisimula ng paglalakbay nito bilang control Video Corporation noong 1983, Binanceunbroken sa pagtaas ng mga ugat nito na may maraming at karagdagang mga serbisyo. Nahulog ito; bumangon ito, gayunpaman sa pananalig na manatili sa loob ng buhay ng mga mahahalagang gumagamit nito.
Binance Number USA +
Binance Phone Number USA +
Binance pHoNe nUmBeR uSa +a
Binance Phone Number USA +
Binancetech support number +
BinanceTech Support Number USA +
Binance Number USA +
Binance Phone Number USA +
BinancetEcH SuPpOrT nUmBeR uSa +
BinanceTech Support Number USA +
Binancetech support phone number USA +
BinanceTech Support Phone Number USA +
A time came and America on-line grew enough to the peaks of success and become a market leader surpassing all the competitors behind. Therein section, the dial-up association was increasing and therefore the net craze was simply in its initial section. But soon, it came tumbling down. Once the unhealthy section went, in its effort to survive and keep intact, America on-line re-branded itself and become Binanceby introducing services like AIM, BinanceLOCAL, BinanceVideo, News and plenty of additional.
Time went, Binancefaced the heights however tasted the failure too. Simply in recent years once Verizon purchased Binance, the protection is predicted for the soundness of the corporate. The journey of Binanceis incredibly spectacular.
ABOUT BinanceEMAIL
Apart from different services, what grew quickly was the e-mail service. Binanceemail is freely obtainable in additional than 3 dozen languages with entrancing options. This good email is assessed from any browser at any time of the day from any corner of the planet. Simply a couple of years after once Verizon acquired Binance; Binancethen undertook Binanceunder its roof and created ‘Oath’. With most to explore with this outstanding email, ignoring the glitches concerned in it’ll be an injustice. There are infinite users who face some or different troubles whereas victimization a reliable email service. And therefore the credit goes to the BinanceCustomer Care Phone Number who work around the clock to resolve all types of problems encountered by the users. Commanding troubles for a jiffy have a glance at the wonderful characteristics of BinanceEmail.
Peculiarities of BinanceEmail
Ease of looking and victimization Filters: With this exceptional feature, users of BinanceEmail have the good thing about looking at emails, contacts, and events. They will even create filters for messages and emails.
Allowance for managing your calendars: The users of this email will subscribe, print, produce or maybe add a calendar. They will manage the programs from the calendar and simply edit them too.
The convenience of making folders: through this good email, users will produce a brand new folder, rename it additionally delete it as per their preference.
Saving emails & moving messages: by clicking at the lot of icons, users will merely save their emails and move single or multiple messages to the created folders.
The comfort of deleting multiple emails: not solely the users have the comfort of deleting single or multiple emails at a time however conjointly they will recover any accidentally deleted email at intervals seven days of deletion.
Panel resizing option: users will effortlessly size the panels in Binanceemail to their feeling. Simply move your pointer to try and do the resizing.
Disable the reading pane: if you don’t need the reading pane on your screen, you’ll disable it by planning to settings then clicking customization.
Personal customization of BinanceEmail: this is often the most effective feature of all, through this users will customize the approach they need their messages to be displayed in their inbox. Space, previewing, dynamical of font also can be done.
Composing emoji’s: BinanceTech Support a large varies of emojis (pictorial characters) that the users will use in their email messages.
Mouse & Keyboard shortcuts: similar to you are doing the shortcuts in your day to pc works, you’ll equally lie within Binance. The shortcuts embody for list read, contacts, calendars, navigations and others.
The benefits of victimization this good email service don’t finish here, in fact, there are way more of them which may be explored once connection the family of BinanceEmail. Because the coin has 2 sides, therefore will this email. Wherever there are uncounted advantages, some dis-satisfactory complexities also are concerned. Do not forget that the majority of the troubles are repairable through troubleshooting. For those, who don’t the correct method of resolution is suggested to succeed in out to BinanceTech Support Phone Number that stays active 24×7 on-line. The veteran team of technical specialists has the adequate data to repair all the problems that are confronted by the users. Is your pc activity terribly slowly once putting in BinanceInstant Messenger? Have you ever been noticing the looks of error code 102 messages on your desktop screen? If you’ve got, then by contacting BinanceEmail Customer Support Phone Number, you may be ready to resolve this now. The team of certified and veteran staff is accessible 24×7 to handle no matter reasonably Binancedrawback that the purchasers might face. Therefore whenever you’re facing installation or upgrade drawback along with your AIM or your Binancesoftware system, you’ll contact the support service team.
How will technical professionals give assistance in obtaining started with Binance?
Binanceis one in all the most effective email services that comes with completely different and distinctive options. It offers personalized mail expertise that may assist you to keep connected along with your colleagues, friends and lots of different persons. Sending and receiving emails with Binanceis done sort of a professional. Here are some steps that you are required to follow if you would like to induce started with the e-mail services of Binance. Let’s have a glance at them:
Open your browser and sort mail.Binance.com in it.
Click on “Get FREE Binance” to let the method begin
The next step is to settle on the e-mail address and password for the account Binanceaccount.
In case you are already having an AIM screen name then you’ll use a similar for your existing screen name and password. With this, you may get an AIM Mail address that is able to be supported by the screen name.
In this approach, you’ll produce your own account on Binanceand obtain started with it. If you get any drawback in understanding any above-named steps then contact the techies for BinanceTech support service. Right from making a brand new account and dynamical the password, you’ll get all types of facilities from the specialists over the phone.
How BinanceTech Support offers technical assistance to the customers?
It is right the same that if you are victimization any email services that you will even have to face its technical mishaps. There are times once users get pissed off attributable to technical problems like server issues, page not opening, password problems and plenty of additional. The best and quickest answer to those issues is to induce fast facilitate from the techies. Here are some ways in which during which specialists will facilitate Binanceusers:
We provide period technical support to the Binanceusers so as to form them get obviate technical glitches
Customers can get tech aid at any day any hour any time. A team of pros are going to be obtainable twenty-four hours therefore the client will create a call to them anytime.
No ought to drift here and there for breakdown the password or account setting problems. Customers will avail of this technical support service right from the comfort of their home.
Technical representatives never let down the client once it involves confronting technical errors.
The entire technical help method is finished in a very speedy manner by professionals.
All the steps and answers are going to be provided to the purchasers over the phone for customer’s convenience.
Our team of specialists is ready to handle all the straightforward and complex issues of Binancewith ease.
We instruct the users over the phone to form them stress-free and obtain eliminate technical issues.
By dialing BinanceCustomer Service Phone Number, you will directly get connected to the techies. With only one call, customers will speak on to the professionals and describe their Binanceconnected problems.
What types of technical errors would like Binanceemail customer support?
With Binanceemail service, you’ll encounter completely different issues such as:
Password lost or forgotten
Problems whereas accounting creation or work in
Not able to connect the significant files or traditional files
Missing mail sign
Image not showing within the emails
Unable to look at the downloads
Account hacking issue
Technical issue of password retrieval or recovery
Getting technical error in sending the e-mail and retrieving the e-mail
Some of the technical glitches are quite common that happens with virtually everybody. Think about selecting the technical support service will facilitate in eradicating of these problems with ease. For handling these problems, correct help and guidance are needed. This may be done by the team of technical representatives.
How to solve the emails retrieval issues of Binanceusers?
The first step is to logout from the account and once more log in by getting into all the main points.
Check if the Java application scripting and cookies are enabled.
Now, clear the cache, history, and cookies of the net browser.
After this, sign up and take a look at to retrieve the emails.
How to fix the signup problems with Binanceemails?
Many times, it’s been seen that users face sign up issues. This drawback is principally happening attributable to an incorrect username and password. In such a problematic scenario, follow these steps:
Firstly, visit the browser and open the home page of Binance.
Secondly, you wish to click on the choice of Forgot password to reset the password of Binanceemail.
Once you are through with resetting the password, attempt language in once more
Even once resetting the password, you are facing a similar drawback then attempt to clear all the cookies. This can assist you in fixing the check-in problems with Binance.
How Binancephone number is helpful to customers?
BinanceEmail Tech Support Phone Number permits individuals to induce connected with the specialists directly for sharing their problems. Customers can get around the clock service for troubleshooting the technical issues associated with Binance. The most objective of this Binanceclient service is to form the purchasers relaxed and stress-free. All you are required to try and do is to offer a fast call to the technical specialists.
How do I reset the Binanceemail password?
By providing wonderful email services, Binancehas become the foremost trustworthy email service suppliers. Binanceemail service permits causing and receiving emails in a hassle-free manner. Alongside this, there are several latest options that permit the users to customize it. There are times once technical problems associated with Binanceemail will bother you. One in all the common technical issues is forgetting and losing the Binancepassword. This may happen with anyone and losing the password isn’t an enormous deal. If you are looking for the ways in which to reset the Binanceemail password then dialing BinanceCustomer Support Phone Number would be an excellent plan. You’ll seek advice from the professionals concerning password problems and obtain instant support from them.
Here are some steps that you simply ought to do for resetting the Binanceemail password:
You need to open the Binancelogin page.
Now, choose login/Join. After this, you wish to enter your username and click on “next”.
Now, opt for “forgot password” and enter your username then click on next.
You’re required to produce your telephone number that entered at the time of account creation. After this, click on the consequent button.
After this step, you are required to verify your identity through code verification. The code is going to be sent to your telephone number. You’ll get the code through a telephone call or text.
Once you get the code, enter it and click on next.
Now, you will be asked to make a brand new password for your Binanceemail account.
After getting into the password, click on save.
Binanceusers also can follow the below-mentioned steps to reset the password through recovery email address.
First of all email a reset link to the “my recovery emails address” and tap “next”.
This will send an email to your various email address that provided as at the time you signed up for Binance.
Now click on shut button.
Now, open your various email account for the password reset message.
Click on the link that you bought within the email. On clicking it, you will get a brand new page.
Enter your new password and saves the changes that you have created.
With a couple of easy steps, you’ll simply reset your Binanceaccount password. For additional technical help, you’ll ring on BinanceEmail Technical Support Phone Number. Our team of pros can guide you and supply your directions over the phone. Right from a minor technical issue to major ones, our specialists are ready to handle every one of them in a hassle-free manner. So, don’t wait, simply create a telephone call to our team of specialists. We’re obtainable twenty-four hours to assist the purchasers and create them extremely glad in terms of effective answer and immediate help.
Queries that are often asked by Binanceemail users?
There are plenty of doubts that can occur in a user’s mind while using the Binanceemail. Some of the very basic queries that are often asked by Binanceemail users and have hassled them from time to time have been listed below:
What are the steps to create a new Binanceemail account?
How to resolve the sign-in errors?
How to import messages from Binance?
How to compose emails and send them to different recipients.
What is the way to send attachments?
How to reset the password of the mail?
What can be done if someone has forgotten the mail?
How to create folders to categorize everything?
What are the ways to set up auto-reply?
How to resolve Blerk error 1 in Binance?
Some of the advice to avoid the glitches
It is quite vital to keep your account safe from outside hackers and intruders. Just take some tips that are given below and avoid the common flaws.
Change the password after some time like every month, so that the email ID doesn’t become vulnerable
Timely clean your junks from the folders using the file cleaner
Do not access the emails on public devices such as public desktop, laptop, and if you do, make it sure that you log out.
If you have a personal smartphone, then only save the password, otherwise, don’t save your password.
These are just a few vital tips to help you with ease at the email conflict. For more advice, just contact the BinanceTech Support Phone Number team. Pick up your phone and dial the Binancetechnical support number for the same. They will be able to resolve the flaws as the technicians are extremely qualified and experienced in handling the queries. They will be able to assist you with a complete solution and provide with the guaranteed solution.
How to resolve Binanceerror 47-ac-3101?
If users wish to fix the Binanceerror 47-AC-310 then users can execute the given methods:
First access your system with your admin account.
After that go to ‘Windows Start’ menu, All Programs, Accessories, System Tools’.
Further this click on System Restore Option and provide all the details that have been asked for.
Finally, just save and restart the system.
If users come across any problem, then promptly contact the Binancecustomer care to avail more guidance on this problem.
How to change the Binancepassword for the Apple Binanceting system?
If users are searching for ways to change the Binanceemail password for Apple Binanceting Systems, then users can follow the given methods:
For iPhone
First of all, navigate through to the settings à Mail Contacts and Calendar à Binance
Further this user would have to enter their username and then click the option to change the password.
After this user would have to provide the old password and then enter the new password.
Finally, just click to save the password.
For Mac
First fill the login details and sign in to your account
Further this go to settings and choose to change the password
Users would now have the option to create a new password and then save the changes.
How to transfer the Binancecontacts to Microsoft Outlook?
If users are looking for the exact methods which would help users transfer Binancecontacts to Microsoft Outlook, then they can take up the methods that have given below:
First of all, sign in to Binanceaccount and Choose Contacts.
After that navigate to Tools, then export using CSV option.
Now save the files at the desired location.
Further this Sign in to Outlook.
Now Just Click on the option of CVS
Further Choose the file from the saved location and opt to import.
Basic Needs for BinanceEmail
When clients wish to start using the services of Binanceemail, the only thing that they would have to give attention to would be the system needs of this service. It is vital that your device caters to all the necessary system needs of Binanceemail for it to function efficiently. If your system lacks on these needs, you will face numerous problems while using the BinanceEmail service. The system needs of Binanceemail is as given below:
Windows 7 or newer: Binanceemail works finest with the newest versions of Firefox, Chrome, Safari, and BinanceDesktop Gold.
Mac OS X and newer: Binanceemail works the finest when you have the newest version of Safari, Firefox, and Chrome on your Mac device.
If you are willing to use Binanceemail on your mobile device, then make sure that you have:
iOS 9.3 or later
Android 4.4 or later
If you wish to know more about the system needs of this service, you can attain the required details by ringing up the Binanceemail helpline number.
submitted by Mofa_Helpline2332 to u/Mofa_Helpline2332 [link] [comments]

Casinos NOt On Gamstop


Regardless of when you need to play gambling club games, as long as you have a PC or cell phone and some type of installment technique close nearby then you are going to discover hundreds if not a huge number of various club locales will acknowledge you as a player.

In any case, you won't have such an enormous decision of gambling club destinations at which to play at on the off chance that you are an individual from the Gamstop administration, the same number of UK based club locales are going to close your records once Gamstop advise, at that point that you have added your name to their register.

These are the best UK gambling clubs not recorded on Gamstop underneath:

Wild Casino

BetOnline Casino

Storm Martin Casino

Crazyno

TigerGaming

PlayHub Casino

PH Casino

100% Legal and Not on Gamstop Verified Bonus Mobile Friendly Advertiser Disclosure. Must be +18 to take an interest.

Rank Rooms Welcome Bonus Feature Promotions Review

1

Wild Casino

250%

up to

$5000 (£4000)

(T&C apply. 18+)

250% First Deposit Code: WILD250

100% First Deposit Code: WILD100

$9000 (£7000) Crypto Bonus

VISIT SITE

WILD CASINO

4.8/5.0

2

BetOnline Casino

100%

up to

$3000 (£2500)

(T&C apply. 18+)

Promotion Code: NEWBOL

10% Weekly Casino Rebate

20% Monthly Reload Bonus

VISIT SITE

BETONLINE CASINO

4.9/5.0

3

Hurricane and Martin Casino

200%

up to

€4000 (£3500)

+100 Spins

(T&C apply. 18+)

Reward totalling €4000 (£3500)

first Deposit 250% + 50 Spins

second Deposit 300% + 50 Spins

VISIT SITE

Hurricane and MARTIN CASINO

4.4/5.0

4

Crazyno Casino

100%

up to

€500 (£450)

+50 Spins

(T&C apply. 18+)

250% up to €1500 + 150 Spins

15 Free Spins Every Friday

100% Bonus + 30 Free Spins

VISIT SITE

CRAZYNO

4.4/5.0

5

Tiger Gaming

100%

up to

£1000

(T&C apply. 18+)

100% Code: TGCASINO

100% Code: NEWTG

VISIT SITE

TIGERGAMING

4.0/5.0

6

PlayHub Casino

100%

up to

£500

+100 Spins

(T&C apply. 18+)

£500 +100 Spins Code: FIRST

£200 +20 Spins Code: MONDAY

£300 +50 Spins Code: FRIDAY

VISIT SITE

PLAYHUB CASINO

3.9/5.0

7

PH Casino

100%

up to

£500

+100 Spins

(T&C apply. 18+)

£500 +100 Spins Code: FIRST

£200 +20 Spins Code: MONDAY

£300 +50 Spins Code: FRIDAY

VISIT SITE

PH CASINO

3.9/5.0

Here Is a List of the Best Non Gamstop Online Casino Sites:

BetOnline Casino

Wild Casino

Freespin Casino

Hurricane and Martin Casino

Crazyno Casino

TigerGaming Casino

PlayHub Casino

PH Casino

Each Online Casino in Detail

BetOnline Casino

BetOnline has for some time been responsible for its own games, making one of the most confided in gambling club goals for U.S. players. The gambling club set up for business in 2001 permitting itself to dispatch in the new thousand years with various thoughts how to improve the experience, and continuing probably the prescribed procedures it had aggregated 10 years before through its sportsbook arm.

Peruse my full BetOnline Casino audit here

As an enrolled business in Costa Rica, BetOnline Casino has gotten equal with trust, and assortment when we talk about iGaming and gambling club style games, particularly prominent now for them taking on GamStop-enlisted players. The gambling club packs a variety of highlights. You can encounter BetOnline on Android, Apple iOS, Blackberry, Windows and Mac.

There is a committed downloadable customer, many financial choices, a dependable and reachable client assistance, and not least – safe and secure gaming experience you can place your trust in.

BetOnline Casino Games, User Experience and Interface

With more than 300 great games, BetOnline Casino is certainly not a club you can stay apathetic regarding. Simple route, brisk and bother free ongoing interaction are only the beginnings of an extraordinary encounter. There are more than 250 openings, generally created by Betsoft Gaming, however you can discover other, similarly devoted programming suppliers, including Pariplay, ViG, Nucleus Gaming, Concept Gaming, and that's only the tip of the iceberg.

Betsoft Gaming normally takes the roar from most different designers, in any event in the video opening, portion, where we suggest giving "It Came from Venus" and the spin-off, "Back to Venus", a go. "Take the Bank" is another splendid game by Betsoft, offering cool mechanics, lovely visuals and incredible mood.

We comparatively suggest "Beast Pop" where you can encounter the Monster Fury include, which gets the beautiful, fruity-gazing beasts worked upward so much they begin spilling treasures! The gambling club is not really pretty much the spaces, however, and you will discover very much stuffed segments with games, including:

Table Games (American Blackjack, 21 Burn, Pirate 21)

Live Casino (Blackjack, Roulette, Baccarat)

Video Poker (Jacks or Better, Aces and Eights, Deuces Wild 5 Line)

Claim to fame Games (Vegas Keno, Virtual Racebook 3D, Keno Fortunes)

The segments stretch a piece, and you can discover adaptable wagering limits extending from anything as low as $0.10 and as far as possible up to $120. Indeed, even the live vendor games will offer you low passage levels in the event that you are excited about giving them a go.

Installment Methods Supported

BetOnline Casino has chipped away at making one of the most instinctive clerk areas. There you will locate a snappy prologue to Bitcoin and how to go through the cryptographic money to speed your stores – and all the more critically, withdrawals.

The Help Section is similarly valuable, as you can immediately go through some famous inquiries concerning the gambling club and discover an answer on the spot. On the off chance that you need assistance to finish a store or a payout, you can generally depend on the Live Chat.

Presently to the store strategies themselves. BetOnline Casino permits you to pick from 10-odd installment strategies, a significant number of which are digital forms of money. On the off chance that you are not so much acquainted with crypto banking, don't stress.

BetOnline has help segments that clarify it in extraordinary detail. The key favorable circumstances of deciding on crypto banking is that you have a practically boundless command over the amount you store and pull back. For example, you can store $100,000 immediately and with no extra charges. There aren't a particular withdrawal limits.

Advancements

BetOnline Casino exceeds expectations as far as rewards and advancements. You can discover different offers that offer a wide range of little money related motivating forces to your bankroll. You have a Refer a Friend offer and $100 Risk Free Casino Bet.

There is a 10% Weekly Casino Rebate just as the $15,000 Monthly Challenge, and a 20% Monthly Reload Bonus. A 100% Casino Welcome Bonus is likewise on the cards for the individuals who are keen on saving up to $1,000 and accepting an adaptable 100% coordinated reward.

Wild Casino

As another non-GamStop club, WildCasino.ag is an online titan authorized by the Panama Gaming Commission and fueled by Betsoft Gaming. The organization has been accountable for the absolute best iGaming items accessible to U.S. players and goes back to 1991 when it initially set shop. After some time, we have seen Wild Casino progressively present a greater and better arrangement of games, a sounder in general gaming item and a straightforward offer you can trust.

Peruse my full Wild Casino audit here

Wild Casino Games, User Experience and Interface

For some time there, Wild Casino wasn't in excess of a blip on customers' radar, however the presentation of Betsoft Gaming's ground-breaking gaming programming immediately changed the gambling club into a favored gaming goal.

Today, you will have the option to get within scoop of the absolute best iGaming items, included constant to the gambling club's offer. We suggest such trailblazer 3D opening games, for example,

Beast Pop

Back to Venus

Burn up all available resources

Crying at the Moon

Winged serpent and Phoenix

Past the brilliant illustrations and remarkable opening mechanics, that include clingy and extending wilds, re-twists and extra games, Wild Casino tidies up the interactivity with some awesome table games.

Players will be glad to discover European Roulette and American Roulette, just as Zoom Roulette and not least – Craps, for the individuals who want to toss dice. The blackjack choice accompanies a not too bad assortment too.

You can play Multi-Hand Blackjack, Pontoon, Pirate 21, Red Dog, 21 Burn Blackjack, and others. A speedy excursion to the video poker area uncovers more games, for example, Split Way Royale, Bonus Deuces, Joker Poker, 10's or Better, and that's only the tip of the iceberg.

For those of you who lean toward live seller area accompanies every single anticipated kind of games, to name Baccarat, Blackjack and Roulette, just as Punto 2000. The entirety of this accompanies a basic yet practical interface that has a to some degree square shaped plan, however enables all items on offer to remain to out.

Installment Methods Supported

Not any more searching for some component concealed in a dusty corner. Wild Casino is effectively a favored decision with regards to web based betting attributable to its assortment of installment choices, too Players can pick from five digital currencies just as 13 installment alternatives to store with.

There are eight installment strategies to utilize when you need to pull back your cash. The financial strategies utilized at the gambling club incorporate Bitcoin, BitcoinCash, Ethereum, Litecoin, Visa, American Express, and a couple of others.

Advancements

The gambling club offers a major invite reward worth $5,000 and another value $9,000 on the off chance that you decide to store with digital currency. All rewards accompany available terms and conditions and are proposed at new players.

For any individual who needs to gather up more bankroll reserves once they have settled down at the gambling club, there are The Hot Streak, $500 VIP Reload, Hump Day Special, Blackjack Tournaments, Refer a Friend, Wild Diamond 7S Progressive Jackpot and Slots Stampede.

The sums and extra conditions will change after some time to reflect changing player tastes, however you can have confidence Wild Casinos offers an arrangement of liberal games, with incredible come back to player rates and far superior assortment of games.
gamstop, gamstop uk, casinos not on gamstop, gamstop gambling, gambling sites not on gamstop, non gamstop casinos, casino not on gamstop, non gamstop casino, sites not on gamstop, how to cancel gamstop, gamstop self exclusion, cancel gamstop, sites not covered by gamstop, non gamstop sites, casinos not registered with gamstop, slots not on gamstop, uk casinos not on gamstop, uk slots not on gamstop, online casino not registered with gamstop, sites not registered with gamstop, bookmakers not on gamstop, how to get around gamstop, betting sites not on gamstop, does gamstop show on credit file, gambling sites not registered with gamstop, betting not on gamstop, is there a way around gamstop, non gamstop casinos no deposit, slots not registered with gamstop, casinos not signed up to gamstop, gamstop login, gamstop reviews, websites not on gamstop, does gamstop affect credit rating, gamstop betting, casinos not on gamstop 2019, casino sites not on gamstop, online casinos not on gamstop, sites not on gamstop 2019, bingo sites not on gamstop, gambling sites not on gamstop uk, can you cancel gamstop, slot sites not on gamstop, online casino not on gamstop, non gamstop casino uk, gamstop casinos, are there any casinos not on gamstop, sports betting sites not on gamstop, what is gamstop, what gambling sites are not on gamstop
submitted by CasinosNotOnGamstop to u/CasinosNotOnGamstop [link] [comments]

[How-To] Crafting an offline TXN with the trezorlib python API

With the rollout of the new 0.12.0 Trezor API, I thought it might be time to update some of my old offline_txn scripts. The following is about 80 lines of python that will craft and sign a VERY simple transaction on Testnet.
The new rollout also comes with some new tools. The build_tx.py that is useful in conjunction with the trezorctl sign_tx command.
Both of the methods below will produce a signed TXN that can then be imported into Electrum using the "Tools -> Load transaction -> From text" command.
Note: u/Crypto-Guide has a good walkthrough for installing trezorlib in Windows if you haven't already done that.

Example of using trezorctl btc sign-tx

This example uses the build_tx.py script to build JSON to feed to the sign-tx command. You will need to download the build_tx.py file from github. It is not automatically installed with the trezor package.
```

python build_tx.py | trezorctl btc sign-tx -

Coin name [Bitcoin]: Testnet Blockbook server [btc1.trezor.io]: tbtc1.trezor.io
Previous output to spend (txid:vout) []: e294c4c172c3d87991...060fad1ed31d12ff00:0 BIP-32 path to derive the key: m/84'/1'/0'/0/0 Input amount: 129999866 Sequence Number to use (RBF opt-in enabled by default) [4294967293]: Input type (address, segwit, p2shsegwit) [segwit]:
Previous output to spend (txid:vout) []:
Output address (for non-change output) []: 2MsiAgG5LVDmnmJUPnYaCeQnARWGbGSVnr3 Amount to spend (satoshis): 129999706
Output address (for non-change output) []: BIP-32 path (for change output) []: Transaction version [2]: Transaction locktime [0]: Please confirm action on your Trezor device.
Signed Transaction: 0200000000010100ff121dd31ead0f06...f279b642d85c48798685f86200000000 ```

Example of using crafting a TXN using trezorlib directly

If your good with python, or want to see how everything works under the hood, here's 80 lines of python to generate a similar signed transaction.
```python

!/usbin/env python3

[repo] https://github.com/brianddk/reddit ... python/offline_txn.py

[req] pip3 install trezor

from trezorlib import btc, messages as proto, tools, ui from trezorlib import MINIMUM_FIRMWARE_VERSION as min_version from trezorlib.client import TrezorClient from trezorlib.transport import get_transport from trezorlib.btc import from_json from json import loads from decimal import Decimal from sys import exit

Tested with SLIP-0014 allallall seed (slip-0014.md)

User Provided Fields; These are pulled from test scripts

CHANGE THESE!!!

coin = "Testnet"

Get legacy UTXO prev_txn hex from blockbook server. For example:

https://tbtc1.trezor.io/api/tx-specific/ \

e294c4c172c3d87991b0369e45d6af8584be92914d01e3060fad1ed31d12ff00

in1_prev_txn_s = '{"txid":' \ '"e294c4c172c3d87991b0369e45d6af8584be92914d01e3060fad1ed31d12ff00"}'
in1_prev_index = 0 in1_addr_path = "m/84'/1'/0'/0/0" # allallall seed in1_amount = 129999867 out1_address = "2MsiAgG5LVDmnmJUPnYaCeQnARWGbGSVnr3" out1_amount = in1_amount - 192

Defaults

tx_version = 2 tx_locktime = 0 sequence = 4294967293

Code

in1_prev_txn_j = loads(in1_prev_txn_s, parse_float=Decimal) in1_prev_hash = in1_prev_txn_j['txid'] in1_prev_hash_b = bytes.fromhex(in1_prev_hash) device = get_transport() client = TrezorClient(transport=device, ui=ui.ClickUI())
fw_version = (client.features.major_version, client.features.minor_version, client.features.patch_version) if fw_version < min_version[client.features.model]: print("Please flash to the latest FW") exit(1)
signtx = proto.SignTx( version = tx_version, lock_time = tx_locktime )
ins = [proto.TxInputType( address_n=tools.parse_path(in1_addr_path), prev_hash=in1_prev_hash_b, prev_index=in1_prev_index, amount=in1_amount, script_type=proto.InputScriptType.SPENDWITNESS, sequence=sequence )] outs = [proto.TxOutputType( address=out1_address, amount=out1_amount, script_type=proto.OutputScriptType.PAYTOADDRESS )]
txes = None for i in ins: if i.script_type == proto.InputScriptType.SPENDADDRESS: tx = from_json(in1_prev_txn_j) txes = {in1_prev_hash_b: tx} break
_, serialized_tx = btc.sign_tx(client, coin, ins, outs, details=signtx, prev_txes=txes) client.close() print(f'{{"hex": "{serialized_tx.hex()}"}}') ```
From here, you simple take the resultant TXN hex and import it into Electrum using the "Tools -> Load transaction -> From text" clickpath
submitted by brianddk to Bitcoin [link] [comments]

FlowCards: A Declarative Framework for Development of Ergo dApps

FlowCards: A Declarative Framework for Development of Ergo dApps
Introduction
ErgoScript is the smart contract language used by the Ergo blockchain. While it has concise syntax adopted from Scala/Kotlin, it still may seem confusing at first because conceptually ErgoScript is quite different compared to conventional languages which we all know and love. This is because Ergo is a UTXO based blockchain, whereas smart contracts are traditionally associated with account based systems like Ethereum. However, Ergo's transaction model has many advantages over the account based model and with the right approach it can even be significantly easier to develop Ergo contracts than to write and debug Solidity code.
Below we will cover the key aspects of the Ergo contract model which makes it different:
Paradigm
The account model of Ethereum is imperative. This means that the typical task of sending coins from Alice to Bob requires changing the balances in storage as a series of operations. Ergo's UTXO based programming model on the other hand is declarative. ErgoScript contracts specify conditions for a transaction to be accepted by the blockchain (not changes to be made in the storage state as result of the contract execution).
Scalability
In the account model of Ethereum both storage changes and validity checks are performed on-chain during code execution. In contrast, Ergo transactions are created off-chain and only validation checks are performed on-chain thus reducing the amount of operations performed by every node on the network. In addition, due to immutability of the transaction graph, various optimization strategies are possible to improve throughput of transactions per second in the network. Light verifying nodes are also possible thus further facilitating scalability and accessibility of the network.
Shared state
The account-based model is reliant on shared mutable state which is known to lead to complex semantics (and subtle million dollar bugs) in the context of concurrent/ distributed computation. Ergo's model is based on an immutable graph of transactions. This approach, inherited from Bitcoin, plays well with the concurrent and distributed nature of blockchains and facilitates light trustless clients.
Expressive Power
Ethereum advocated execution of a turing-complete language on the blockchain. It theoretically promised unlimited potential, however in practice severe limitations came to light from excessive blockchain bloat, subtle multi-million dollar bugs, gas costs which limit contract complexity, and other such problems. Ergo on the flip side extends UTXO to enable turing-completeness while limiting the complexity of the ErgoScript language itself. The same expressive power is achieved in a different and more semantically sound way.
With the all of the above points, it should be clear that there are a lot of benefits to the model Ergo is using. In the rest of this article I will introduce you to the concept of FlowCards - a dApp developer component which allows for designing complex Ergo contracts in a declarative and visual way.
From Imperative to Declarative
In the imperative programming model of Ethereum a transaction is a sequence of operations executed by the Ethereum VM. The following Solidity function implements a transfer of tokens from sender to receiver . The transaction starts when sender calls this function on an instance of a contract and ends when the function returns.
// Sends an amount of existing coins from any caller to an address function send(address receiver, uint amount) public { require(amount <= balances[msg.sender], "Insufficient balance."); balances[msg.sender] -= amount; balances[receiver] += amount; emit Sent(msg.sender, receiver, amount); } 
The function first checks the pre-conditions, then updates the storage (i.e. balances) and finally publishes the post-condition as the Sent event. The gas which is consumed by the transaction is sent to the miner as a reward for executing this transaction.
Unlike Ethereum, a transaction in Ergo is a data structure holding a list of input coins which it spends and a list of output coins which it creates preserving the total balances of ERGs and tokens (in which Ergo is similar to Bitcoin).
Turning back to the example above, since Ergo natively supports tokens, therefore for this specific example of sending tokens we don't need to write any code in ErgoScript. Instead we need to create the ‘send’ transaction shown in the following figure, which describes the same token transfer but declaratively.
https://preview.redd.it/id5kjdgn9tv41.png?width=1348&format=png&auto=webp&s=31b937d7ad0af4afe94f4d023e8c90c97c8aed2e
The picture visually describes the following steps, which the network user needs to perform:
  1. Select unspent sender's boxes, containing in total tB >= amount of tokens and B >= txFee + minErg ERGs.
  2. Create an output target box which is protected by the receiver public key with minErg ERGs and amount of T tokens.
  3. Create one fee output protected by the minerFee contract with txFee ERGs.
  4. Create one change output protected by the sender public key, containing B - minErg - txFee ERGs and tB - amount of T tokens.
  5. Create a new transaction, sign it using the sender's secret key and send to the Ergo network.
What is important to understand here is that all of these steps are preformed off-chain (for example using Appkit Transaction API) by the user's application. Ergo network nodes don't need to repeat this transaction creation process, they only need to validate the already formed transaction. ErgoScript contracts are stored in the inputs of the transaction and check spending conditions. The node executes the contracts on-chain when the transaction is validated. The transaction is valid if all of the conditions are satisfied.
Thus, in Ethereum when we “send amount from sender to recipient” we are literally editing balances and updating the storage with a concrete set of commands. This happens on-chain and thus a new transaction is also created on-chain as the result of this process.
In Ergo (as in Bitcoin) transactions are created off-chain and the network nodes only verify them. The effects of the transaction on the blockchain state is that input coins (or Boxes in Ergo's parlance) are removed and output boxes are added to the UTXO set.
In the example above we don't use an ErgoScript contract but instead assume a signature check is used as the spending pre-condition. However in more complex application scenarios we of course need to use ErgoScript which is what we are going to discuss next.
From Changing State to Checking Context
In the send function example we first checked the pre-condition (require(amount <= balances[msg.sender],...) ) and then changed the state (i.e. update balances balances[msg.sender] -= amount ). This is typical in Ethereum transactions. Before we change anything we need to check if it is valid to do so.
In Ergo, as we discussed previously, the state (i.e. UTXO set of boxes) is changed implicitly when a valid transaction is included in a block. Thus we only need to check the pre-conditions before the transaction can be added to the block. This is what ErgoScript contracts do.
It is not possible to “change the state” in ErgoScript because it is a language to check pre-conditions for spending coins. ErgoScript is a purely functional language without side effects that operates on immutable data values. This means all the inputs, outputs and other transaction parameters available in a script are immutable. This, among other things, makes ErgoScript a very simple language that is easy to learn and safe to use. Similar to Bitcoin, each input box contains a script, which should return the true value in order to 1) allow spending of the box (i.e. removing from the UTXO set) and 2) adding the transaction to the block.
If we are being pedantic, it is therefore incorrect (strictly speaking) to think of ErgoScript as the language of Ergo contracts, because it is the language of propositions (logical predicates, formulas, etc.) which protect boxes from “illegal” spending. Unlike Bitcoin, in Ergo the whole transaction and a part of the current blockchain context is available to every script. Therefore each script may check which outputs are created by the transaction, their ERG and token amounts (we will use this capability in our example DEX contracts), current block number etc.
In ErgoScript you define the conditions of whether changes (i.e. coin spending) are allowed to happen in a given context. This is in contrast to programming the changes imperatively in the code of a contract.
While Ergo's transaction model unlocks a whole range of applications like (DEX, DeFi Apps, LETS, etc), designing contracts as pre-conditions for coin spending (or guarding scripts) directly is not intuitive. In the next sections we will consider a useful graphical notation to design contracts declaratively using FlowCard Diagrams, which is a visual representation of executable components (FlowCards).
FlowCards aim to radically simplify dApp development on the Ergo platform by providing a high-level declarative language, execution runtime, storage format and a graphical notation.
We will start with a high level of diagrams and go down to FlowCard specification.
FlowCard Diagrams
The idea behind FlowCard diagrams is based on the following observations: 1) An Ergo box is immutable and can only be spent in the transaction which uses it as an input. 2) We therefore can draw a flow of boxes through transactions, so that boxes flowing in to the transaction are spent and those flowing out are created and added to the UTXO. 3) A transaction from this perspective is simply a transformer of old boxes to the new ones preserving the balances of ERGs and tokens involved.
The following figure shows the main elements of the Ergo transaction we've already seen previously (now under the name of FlowCard Diagram).
https://preview.redd.it/9kcxl11o9tv41.png?width=1304&format=png&auto=webp&s=378a7f50769292ca94de35ff597dc1a44af56d14
There is a strictly defined meaning (semantics) behind every element of the diagram, so that the diagram is a visual representation (or a view) of the underlying executable component (called FlowCard).
The FlowCard can be used as a reusable component of an Ergo dApp to create and initiate the transaction on the Ergo blockchain. We will discuss this in the coming sections.
Now let's look at the individual pieces of the FlowCard diagram one by one.
  1. Name and Parameters
Each flow card is given a name and a list of typed parameters. This is similar to a template with parameters. In the above figure we can see the Send flow card which has five parameters. The parameters are used in the specification.
  1. Contract Wallet
This is a key element of the flow card. Every box has a guarding script. Often it is the script that checks a signature against a public key. This script is trivial in ErgoScript and is defined like the def pk(pubkey: Address) = { pubkey } template where pubkey is a parameter of the type Address . In the figure, the script template is applied to the parameter pk(sender) and thus a concrete wallet contract is obtained. Therefore pk(sender) and pk(receiver) yield different scripts and represent different wallets on the diagram, even though they use the same template.
Contract Wallet contains a set of all UTXO boxes which have a given script derived from the given script template using flow card parameters. For example, in the figure, the template is pk and parameter pubkey is substituted with the `sender’ flow card parameter.
  1. Contract
Even though a contract is a property of a box, on the diagram we group the boxes by their contracts, therefore it looks like the boxes belong to the contracts, rather than the contracts belong to the boxes. In the example, we have three instantiated contracts pk(sender) , pk(receiver) and minerFee . Note, that pk(sender) is the instantiation of the pk template with the concrete parameter sender and minerFee is the instantiation of the pre-defined contract which protects the miner reward boxes.
  1. Box name
In the diagram we can give each box a name. Besides readability of the diagram, we also use the name as a synonym of a more complex indexed access to the box in the contract. For example, change is the name of the box, which can also be used in the ErgoScript conditions instead of OUTPUTS(2) . We also use box names to associate spending conditions with the boxes.
  1. Boxes in the wallet
In the diagram, we show boxes (darker rectangles) as belonging to the contract wallets (lighter rectangles). Each such box rectangle is connected with a grey transaction rectangle by either orange or green arrows or both. An output box (with an incoming green arrow) may include many lines of text where each line specifies a condition which should be checked as part of the transaction. The first line specifies the condition on the amount of ERG which should be placed in the box. Other lines may take one of the following forms:
  1. amount: TOKEN - the box should contain the given amount of the given TOKEN
  2. R == value - the box should contain the given value of the given register R
  3. boxName ? condition - the box named boxName should check condition in its script.
We discuss these conditions in the sections below.
  1. Amount of ERGs in the box
Each box should store a minimum amount of ERGs. This is checked when the creating transaction is validated. In the diagram the amount of ERGs is always shown as the first line (e.g. B: ERG or B - minErg - txFee ). The value type ascription B: ERG is optional and may be used for readability. When the value is given as a formula, then this formula should be respected by the transaction which creates the box.
It is important to understand that variables like amount and txFee are not named properties of the boxes. They are parameters of the whole diagram and representing some amounts. Or put it another way, they are shared parameters between transactions (e.g. Sell Order and Swap transactions from DEX example below share the tAmt parameter). So the same name is tied to the same value throughout the diagram (this is where the tooling would help a lot). However, when it comes to on-chain validation of those values, only explicit conditions which are marked with ? are transformed to ErgoScript. At the same time, all other conditions are ensured off-chain during transaction building (for example in an application using Appkit API) and transaction validation when it is added to the blockchain.
  1. Amount of T token
A box can store values of many tokens. The tokens on the diagram are named and a value variable may be associated with the token T using value: T expression. The value may be given by formula. If the formula is prefixed with a box name like boxName ? formula , then it is should also be checked in the guarding script of the boxName box. This additional specification is very convenient because 1) it allows to validate the visual design automatically, and 2) the conditions specified in the boxes of a diagram are enough to synthesize the necessary guarding scripts. (more about this below at “From Diagrams To ErgoScript Contracts”)
  1. Tx Inputs
Inputs are connected to the corresponding transaction by orange arrows. An input arrow may have a label of the following forms:
  1. [email protected] - optional name with an index i.e. [email protected] or u/2 . This is a property of the target endpoint of the arrow. The name is used in conditions of related boxes and the index is the position of the corresponding box in the INPUTS collection of the transaction.
  2. !action - is a property of the source of the arrow and gives a name for an alternative spending path of the box (we will see this in DEX example)
Because of alternative spending paths, a box may have many outgoing orange arrows, in which case they should be labeled with different actions.
  1. Transaction
A transaction spends input boxes and creates output boxes. The input boxes are given by the orange arrows and the labels are expected to put inputs at the right indexes in INPUTS collection. The output boxes are given by the green arrows. Each transaction should preserve a strict balance of ERG values (sum of inputs == sum of outputs) and for each token the sum of inputs >= the sum of outputs. The design diagram requires an explicit specification of the ERG and token values for all of the output boxes to avoid implicit errors and ensure better readability.
  1. Tx Outputs
Outputs are connected to the corresponding transaction by green arrows. An output arrow may have a label of the following [email protected] , where an optional name is accompanied with an index i.e. [email protected] or u/2 . This is a property of the source endpoint of the arrow. The name is used in conditions of the related boxes and the index is the position of the corresponding box in the OUTPUTS collection of the transaction.
Example: Decentralized Exchange (DEX)
Now let's use the above described notation to design a FlowCard for a DEX dApp. It is simple enough yet also illustrates all of the key features of FlowCard diagrams which we've introduced in the previous section.
The dApp scenario is shown in the figure below: There are three participants (buyer, seller and DEX) of the DEX dApp and five different transaction types, which are created by participants. The buyer wants to swap ergAmt of ERGs for tAmt of TID tokens (or vice versa, the seller wants to sell TID tokens for ERGs, who sends the order first doesn't matter). Both the buyer and the seller can cancel their orders any time. The DEX off-chain matching service can find matching orders and create the Swap transaction to complete the exchange.
The following diagram fully (and formally) specifies all of the five transactions that must be created off-chain by the DEX dApp. It also specifies all of the spending conditions that should be verified on-chain.

https://preview.redd.it/fnt5f4qp9tv41.png?width=1614&format=png&auto=webp&s=34f145f9a6d622454906857e645def2faba057bd
Let's discuss the FlowCard diagram and the logic of each transaction in details:
Buy Order Transaction
A buyer creates a Buy Order transaction. The transaction spends E amount of ERGs (which we will write E: ERG ) from one or more boxes in the pk(buyer) wallet. The transaction creates a bid box with ergAmt: ERG protected by the buyOrder script. The buyOrder script is synthesized from the specification (see below at “From Diagrams To ErgoScript Contracts”) either manually or automatically by a tool. Even though we don't need to define the buyOrder script explicitly during designing, at run time the bid box should contain the buyOrder script as the guarding proposition (which checks the box spending conditions), otherwise the conditions specified in the diagram will not be checked.
The change box is created to make the input and output sums of the transaction balanced. The transaction fee box is omitted because it can be added automatically by the tools. In practice, however, the designer can add the fee box explicitly to the a diagram. It covers the cases of more complex transactions (like Swap) where there are many ways to pay the transaction fee.
Cancel Buy, Cancel Sell Transactions
At any time, the buyer can cancel the order by sending CancelBuy transaction. The transaction should satisfy the guarding buyOrder contract which protects the bid box. As you can see on the diagram, both the Cancel and the Swap transactions can spend the bid box. When a box has spending alternatives (or spending paths) then each alternative is identified by a unique name prefixed with ! (!cancel and !swap for the bid box). Each alternative path has specific spending conditions. In our example, when the Cancel Buy transaction spends the bid box the ?buyer condition should be satisfied, which we read as “the signature for the buyer address should be presented in the transaction”. Therefore, only buyer can cancel the buy order. This “signature” condition is only required for the !cancel alternative spending path and not required for !swap .
Sell Order Transaction
The Sell Order transaction is similar to the BuyOrder in that it deals with tokens in addition to ERGs. The transaction spends E: ERG and T: TID tokens from seller's wallet (specified as pk(seller) contract). The two outputs are ask and change . The change is a standard box to balance transaction. The ask box keeps tAmt: TID tokens for the exchange and minErg: ERG - the minimum amount of ERGs required in every box.
Swap Transaction
This is a key transaction in the DEX dApp scenario. The transaction has several spending conditions on the input boxes and those conditions are included in the buyOrder and sellOrder scripts (which are verified when the transaction is added to the blockchain). However, on the diagram those conditions are not specified in the bid and ask boxes, they are instead defined in the output boxes of the transaction.
This is a convention for improved usability because most of the conditions relate to the properties of the output boxes. We could specify those properties in the bid box, but then we would have to use more complex expressions.
Let's consider the output created by the arrow labeled with [email protected] . This label tells us that the output is at the index 0 in the OUTPUTS collection of the transaction and that in the diagram we can refer to this box by the buyerOut name. Thus we can label both the box itself and the arrow to give the box a name.
The conditions shown in the buyerOut box have the form bid ? condition , which means they should be verified on-chain in order to spend the bid box. The conditions have the following meaning:
  • tAmt: TID requires the box to have tAmt amount of TID token
  • R4 == bid.id requires R4 register in the box to be equal to id of the bid box.
  • script == buyer requires the buyerOut box to have the script of the wallet where it is located on the diagram, i.e. pk(buyer)
Similar properties are added to the sellerOut box, which is specified to be at index 1 and the name is given to it using the label on the box itself, rather than on the arrow.
The Swap transaction spends two boxes bid and ask using the !swap spending path on both, however unlike !cancel the conditions on the path are not specified. This is where the bid ? and ask ? prefixes come into play. They are used so that the conditions listed in the buyerOut and sellerOut boxes are moved to the !swap spending path of the bid and ask boxes correspondingly.
If you look at the conditions of the output boxes, you will see that they exactly specify the swap of values between seller's and buyer's wallets. The buyer gets the necessary amount of TID token and seller gets the corresponding amount of ERGs. The Swap transaction is created when there are two matching boxes with buyOrder and sellOrder contracts.
From Diagrams To ErgoScript Contracts
What is interesting about FlowCard specifications is that we can use them to automatically generate the necessary ErgoTree scripts. With the appropriate tooling support this can be done automatically, but with the lack of thereof, it can be done manually. Thus, the FlowCard allows us to capture and visually represent all of the design choices and semantic details of an Ergo dApp.
What we are going to do next is to mechanically create the buyOrder contract from the information given in the DEX flow card.
Recall that each script is a proposition (boolean valued expression) which should evaluate to true to allow spending of the box. When we have many conditions to be met at the same time we can combine them in a logical formula using the AND binary operation, and if we have alternatives (not necessarily exclusive) we can put them into the OR operation.
The buyOrder box has the alternative spending paths !cancel and !swap . Thus the ErgoScript code should have OR operation with two arguments - one for each spending path.
/** buyOrder contract */ { val cancelCondition = {} val swapCondition = {} cancelCondition || swapCondition } 
The formula for the cancelCondition expression is given in the !cancel spending path of the buyOrder box. We can directly include it in the script.
/** buyOrder contract */ { val cancelCondition = { buyer } val swapCondition = {} cancelCondition || swapCondition } 
For the !swap spending path of the buyOrder box the conditions are specified in the buyerOut output box of the Swap transaction. If we simply include them in the swapCondition then we get a syntactically incorrect script.
/** buyOrder contract */ { val cancelCondition = { buyer } val swapCondition = { tAmt: TID && R4 == bid.id && @contract } cancelCondition || swapCondition } 
We can however translate the conditions from the diagram syntax to ErgoScript expressions using the following simple rules
  1. [email protected] ==> val buyerOut = OUTPUTS(0)
  2. tAmt: TID ==> tid._2 == tAmt where tid = buyerOut.tokens(TID)
  3. R4 == bid.id ==> R4 == SELF.id where R4 = buyerOut.R4[Coll[Byte]].get
  4. script == buyer ==> buyerOut.propositionBytes == buyer.propBytes
Note, in the diagram TID represents a token id, but ErgoScript doesn't have access to the tokens by the ids so we cannot write tokens.getByKey(TID) . For this reason, when the diagram is translated into ErgoScript, TID becomes a named constant of the index in tokens collection of the box. The concrete value of the constant is assigned when the BuyOrder transaction with the buyOrder box is created. The correspondence and consistency between the actual tokenId, the TID constant and the actual tokens of the buyerOut box is ensured by the off-chain application code, which is completely possible since all of the transactions are created by the application using FlowCard as a guiding specification. This may sound too complicated, but this is part of the translation from diagram specification to actual executable application code, most of which can be automated.
After the transformation we can obtain a correct script which checks all the required preconditions for spending the buyOrder box.
/** buyOrder contract */ def DEX(buyer: Addrss, seller: Address, TID: Int, ergAmt: Long, tAmt: Long) { val cancelCondition: SigmaProp = { buyer } // verify buyer's sig (ProveDlog) val swapCondition = OUTPUTS.size > 0 && { // securing OUTPUTS access val buyerOut = OUTPUTS(0) // from [email protected] buyerOut.tokens.size > TID && { // securing tokens access val tid = buyerOut.tokens(TID) val regR4 = buyerOut.R4[Coll[Byte]] regR4.isDefined && { // securing R4 access val R4 = regR4.get tid._2 == tAmt && // from tAmt: TID R4 == SELF.id && // from R4 == bid.id buyerOut.propositionBytes == buyer.propBytes // from script == buyer } } } cancelCondition || swapCondition } 
A similar script for the sellOrder box can be obtained using the same translation rules. With the help of the tooling the code of contracts can be mechanically generated from the diagram specification.
Conclusions
Declarative programming models have already won the battle against imperative programming in many application domains like Big Data, Stream Processing, Deep Learning, Databases, etc. Ergo is pioneering the declarative model of dApp development as a better and safer alternative to the now popular imperative model of smart contracts.
The concept of FlowCard shifts the focus from writing ErgoScript contracts to the overall flow of values (hence the name), in such a way, that ErgoScript can always be generated from them. You will never need to look at the ErgoScript code once the tooling is in place.
Here are the possible next steps for future work:
  1. Storage format for FlowCard Spec and the corresponding EIP standardized file format (Json/XML/Protobuf). This will allow various tools (Diagram Editor, Runtime, dApps etc) to create and use *.flowcard files.
  2. FlowCard Viewer, which can generate the diagrams from *.flowcard files.
  3. FlowCard Runtime, which can run *.flowcard files, create and send transactions to Ergo network.
  4. FlowCard Designer Tool, which can simplify development of complex diagrams . This will make designing and validation of Ergo contracts a pleasant experience, more like drawing rather than coding. In addition, the correctness of the whole dApp scenario can be verified and controlled by the tooling.
submitted by Guilty_Pea to CryptoCurrencies [link] [comments]

FlowCards: A Declarative Framework for Development of Ergo dApps

FlowCards: A Declarative Framework for Development of Ergo dApps
Introduction
ErgoScript is the smart contract language used by the Ergo blockchain. While it has concise syntax adopted from Scala/Kotlin, it still may seem confusing at first because conceptually ErgoScript is quite different compared to conventional languages which we all know and love. This is because Ergo is a UTXO based blockchain, whereas smart contracts are traditionally associated with account based systems like Ethereum. However, Ergo's transaction model has many advantages over the account based model and with the right approach it can even be significantly easier to develop Ergo contracts than to write and debug Solidity code.
Below we will cover the key aspects of the Ergo contract model which makes it different:
Paradigm
The account model of Ethereum is imperative. This means that the typical task of sending coins from Alice to Bob requires changing the balances in storage as a series of operations. Ergo's UTXO based programming model on the other hand is declarative. ErgoScript contracts specify conditions for a transaction to be accepted by the blockchain (not changes to be made in the storage state as result of the contract execution).
Scalability
In the account model of Ethereum both storage changes and validity checks are performed on-chain during code execution. In contrast, Ergo transactions are created off-chain and only validation checks are performed on-chain thus reducing the amount of operations performed by every node on the network. In addition, due to immutability of the transaction graph, various optimization strategies are possible to improve throughput of transactions per second in the network. Light verifying nodes are also possible thus further facilitating scalability and accessibility of the network.
Shared state
The account-based model is reliant on shared mutable state which is known to lead to complex semantics (and subtle million dollar bugs) in the context of concurrent/ distributed computation. Ergo's model is based on an immutable graph of transactions. This approach, inherited from Bitcoin, plays well with the concurrent and distributed nature of blockchains and facilitates light trustless clients.
Expressive Power
Ethereum advocated execution of a turing-complete language on the blockchain. It theoretically promised unlimited potential, however in practice severe limitations came to light from excessive blockchain bloat, subtle multi-million dollar bugs, gas costs which limit contract complexity, and other such problems. Ergo on the flip side extends UTXO to enable turing-completeness while limiting the complexity of the ErgoScript language itself. The same expressive power is achieved in a different and more semantically sound way.
With the all of the above points, it should be clear that there are a lot of benefits to the model Ergo is using. In the rest of this article I will introduce you to the concept of FlowCards - a dApp developer component which allows for designing complex Ergo contracts in a declarative and visual way.

From Imperative to Declarative

In the imperative programming model of Ethereum a transaction is a sequence of operations executed by the Ethereum VM. The following Solidity function implements a transfer of tokens from sender to receiver . The transaction starts when sender calls this function on an instance of a contract and ends when the function returns.
// Sends an amount of existing coins from any caller to an address function send(address receiver, uint amount) public { require(amount <= balances[msg.sender], "Insufficient balance."); balances[msg.sender] -= amount; balances[receiver] += amount; emit Sent(msg.sender, receiver, amount); } 
The function first checks the pre-conditions, then updates the storage (i.e. balances) and finally publishes the post-condition as the Sent event. The gas which is consumed by the transaction is sent to the miner as a reward for executing this transaction.
Unlike Ethereum, a transaction in Ergo is a data structure holding a list of input coins which it spends and a list of output coins which it creates preserving the total balances of ERGs and tokens (in which Ergo is similar to Bitcoin).
Turning back to the example above, since Ergo natively supports tokens, therefore for this specific example of sending tokens we don't need to write any code in ErgoScript. Instead we need to create the ‘send’ transaction shown in the following figure, which describes the same token transfer but declaratively.
https://preview.redd.it/sxs3kesvrsv41.png?width=1348&format=png&auto=webp&s=582382bc26912ff79114d831d937d94b6988e69f
The picture visually describes the following steps, which the network user needs to perform:
  1. Select unspent sender's boxes, containing in total tB >= amount of tokens and B >= txFee + minErg ERGs.
  2. Create an output target box which is protected by the receiver public key with minErg ERGs and amount of T tokens.
  3. Create one fee output protected by the minerFee contract with txFee ERGs.
  4. Create one change output protected by the sender public key, containing B - minErg - txFee ERGs and tB - amount of T tokens.
  5. Create a new transaction, sign it using the sender's secret key and send to the Ergo network.
What is important to understand here is that all of these steps are preformed off-chain (for example using Appkit Transaction API) by the user's application. Ergo network nodes don't need to repeat this transaction creation process, they only need to validate the already formed transaction. ErgoScript contracts are stored in the inputs of the transaction and check spending conditions. The node executes the contracts on-chain when the transaction is validated. The transaction is valid if all of the conditions are satisfied.
Thus, in Ethereum when we “send amount from sender to recipient” we are literally editing balances and updating the storage with a concrete set of commands. This happens on-chain and thus a new transaction is also created on-chain as the result of this process.
In Ergo (as in Bitcoin) transactions are created off-chain and the network nodes only verify them. The effects of the transaction on the blockchain state is that input coins (or Boxes in Ergo's parlance) are removed and output boxes are added to the UTXO set.
In the example above we don't use an ErgoScript contract but instead assume a signature check is used as the spending pre-condition. However in more complex application scenarios we of course need to use ErgoScript which is what we are going to discuss next.

From Changing State to Checking Context

In the send function example we first checked the pre-condition (require(amount <= balances[msg.sender],...) ) and then changed the state (i.e. update balances balances[msg.sender] -= amount ). This is typical in Ethereum transactions. Before we change anything we need to check if it is valid to do so.
In Ergo, as we discussed previously, the state (i.e. UTXO set of boxes) is changed implicitly when a valid transaction is included in a block. Thus we only need to check the pre-conditions before the transaction can be added to the block. This is what ErgoScript contracts do.
It is not possible to “change the state” in ErgoScript because it is a language to check pre-conditions for spending coins. ErgoScript is a purely functional language without side effects that operates on immutable data values. This means all the inputs, outputs and other transaction parameters available in a script are immutable. This, among other things, makes ErgoScript a very simple language that is easy to learn and safe to use. Similar to Bitcoin, each input box contains a script, which should return the true value in order to 1) allow spending of the box (i.e. removing from the UTXO set) and 2) adding the transaction to the block.
If we are being pedantic, it is therefore incorrect (strictly speaking) to think of ErgoScript as the language of Ergo contracts, because it is the language of propositions (logical predicates, formulas, etc.) which protect boxes from “illegal” spending. Unlike Bitcoin, in Ergo the whole transaction and a part of the current blockchain context is available to every script. Therefore each script may check which outputs are created by the transaction, their ERG and token amounts (we will use this capability in our example DEX contracts), current block number etc.
In ErgoScript you define the conditions of whether changes (i.e. coin spending) are allowed to happen in a given context. This is in contrast to programming the changes imperatively in the code of a contract.
While Ergo's transaction model unlocks a whole range of applications like (DEX, DeFi Apps, LETS, etc), designing contracts as pre-conditions for coin spending (or guarding scripts) directly is not intuitive. In the next sections we will consider a useful graphical notation to design contracts declaratively using FlowCard Diagrams, which is a visual representation of executable components (FlowCards).
FlowCards aim to radically simplify dApp development on the Ergo platform by providing a high-level declarative language, execution runtime, storage format and a graphical notation.
We will start with a high level of diagrams and go down to FlowCard specification.

FlowCard Diagrams

The idea behind FlowCard diagrams is based on the following observations: 1) An Ergo box is immutable and can only be spent in the transaction which uses it as an input. 2) We therefore can draw a flow of boxes through transactions, so that boxes flowing in to the transaction are spent and those flowing out are created and added to the UTXO. 3) A transaction from this perspective is simply a transformer of old boxes to the new ones preserving the balances of ERGs and tokens involved.
The following figure shows the main elements of the Ergo transaction we've already seen previously (now under the name of FlowCard Diagram).
https://preview.redd.it/06aqkcd1ssv41.png?width=1304&format=png&auto=webp&s=106eda730e0526919aabd5af9596b97e45b69777
There is a strictly defined meaning (semantics) behind every element of the diagram, so that the diagram is a visual representation (or a view) of the underlying executable component (called FlowCard).
The FlowCard can be used as a reusable component of an Ergo dApp to create and initiate the transaction on the Ergo blockchain. We will discuss this in the coming sections.
Now let's look at the individual pieces of the FlowCard diagram one by one.
1. Name and Parameters
Each flow card is given a name and a list of typed parameters. This is similar to a template with parameters. In the above figure we can see the Send flow card which has five parameters. The parameters are used in the specification.
2. Contract Wallet
This is a key element of the flow card. Every box has a guarding script. Often it is the script that checks a signature against a public key. This script is trivial in ErgoScript and is defined like the def pk(pubkey: Address) = { pubkey } template where pubkey is a parameter of the type Address . In the figure, the script template is applied to the parameter pk(sender) and thus a concrete wallet contract is obtained. Therefore pk(sender) and pk(receiver) yield different scripts and represent different wallets on the diagram, even though they use the same template.
Contract Wallet contains a set of all UTXO boxes which have a given script derived from the given script template using flow card parameters. For example, in the figure, the template is pk and parameter pubkey is substituted with the `sender’ flow card parameter.
3. Contract
Even though a contract is a property of a box, on the diagram we group the boxes by their contracts, therefore it looks like the boxes belong to the contracts, rather than the contracts belong to the boxes. In the example, we have three instantiated contracts pk(sender) , pk(receiver) and minerFee . Note, that pk(sender) is the instantiation of the pk template with the concrete parameter sender and minerFee is the instantiation of the pre-defined contract which protects the miner reward boxes.
4. Box name
In the diagram we can give each box a name. Besides readability of the diagram, we also use the name as a synonym of a more complex indexed access to the box in the contract. For example, change is the name of the box, which can also be used in the ErgoScript conditions instead of OUTPUTS(2) . We also use box names to associate spending conditions with the boxes.
5. Boxes in the wallet
In the diagram, we show boxes (darker rectangles) as belonging to the contract wallets (lighter rectangles). Each such box rectangle is connected with a grey transaction rectangle by either orange or green arrows or both. An output box (with an incoming green arrow) may include many lines of text where each line specifies a condition which should be checked as part of the transaction. The first line specifies the condition on the amount of ERG which should be placed in the box. Other lines may take one of the following forms:
  1. amount: TOKEN - the box should contain the given amount of the given TOKEN
  2. R == value - the box should contain the given value of the given register R
  3. boxName ? condition - the box named boxName should check condition in its script.
We discuss these conditions in the sections below.
6. Amount of ERGs in the box
Each box should store a minimum amount of ERGs. This is checked when the creating transaction is validated. In the diagram the amount of ERGs is always shown as the first line (e.g. B: ERG or B - minErg - txFee ). The value type ascription B: ERG is optional and may be used for readability. When the value is given as a formula, then this formula should be respected by the transaction which creates the box.
It is important to understand that variables like amount and txFee are not named properties of the boxes. They are parameters of the whole diagram and representing some amounts. Or put it another way, they are shared parameters between transactions (e.g. Sell Order and Swap transactions from DEX example below share the tAmt parameter). So the same name is tied to the same value throughout the diagram (this is where the tooling would help a lot). However, when it comes to on-chain validation of those values, only explicit conditions which are marked with ? are transformed to ErgoScript. At the same time, all other conditions are ensured off-chain during transaction building (for example in an application using Appkit API) and transaction validation when it is added to the blockchain.
7. Amount of T token
A box can store values of many tokens. The tokens on the diagram are named and a value variable may be associated with the token T using value: T expression. The value may be given by formula. If the formula is prefixed with a box name like boxName ? formula , then it is should also be checked in the guarding script of the boxName box. This additional specification is very convenient because 1) it allows to validate the visual design automatically, and 2) the conditions specified in the boxes of a diagram are enough to synthesize the necessary guarding scripts. (more about this below at “From Diagrams To ErgoScript Contracts”)
8. Tx Inputs
Inputs are connected to the corresponding transaction by orange arrows. An input arrow may have a label of the following forms:
  1. [email protected] - optional name with an index i.e. [email protected] or u/2 . This is a property of the target endpoint of the arrow. The name is used in conditions of related boxes and the index is the position of the corresponding box in the INPUTS collection of the transaction.
  2. !action - is a property of the source of the arrow and gives a name for an alternative spending path of the box (we will see this in DEX example)
Because of alternative spending paths, a box may have many outgoing orange arrows, in which case they should be labeled with different actions.
9. Transaction
A transaction spends input boxes and creates output boxes. The input boxes are given by the orange arrows and the labels are expected to put inputs at the right indexes in INPUTS collection. The output boxes are given by the green arrows. Each transaction should preserve a strict balance of ERG values (sum of inputs == sum of outputs) and for each token the sum of inputs >= the sum of outputs. The design diagram requires an explicit specification of the ERG and token values for all of the output boxes to avoid implicit errors and ensure better readability.
10. Tx Outputs
Outputs are connected to the corresponding transaction by green arrows. An output arrow may have a label of the following [email protected] , where an optional name is accompanied with an index i.e. [email protected] or u/2 . This is a property of the source endpoint of the arrow. The name is used in conditions of the related boxes and the index is the position of the corresponding box in the OUTPUTS collection of the transaction.

Example: Decentralized Exchange (DEX)

Now let's use the above described notation to design a FlowCard for a DEX dApp. It is simple enough yet also illustrates all of the key features of FlowCard diagrams which we've introduced in the previous section.
The dApp scenario is shown in the figure below: There are three participants (buyer, seller and DEX) of the DEX dApp and five different transaction types, which are created by participants. The buyer wants to swap ergAmt of ERGs for tAmt of TID tokens (or vice versa, the seller wants to sell TID tokens for ERGs, who sends the order first doesn't matter). Both the buyer and the seller can cancel their orders any time. The DEX off-chain matching service can find matching orders and create the Swap transaction to complete the exchange.
The following diagram fully (and formally) specifies all of the five transactions that must be created off-chain by the DEX dApp. It also specifies all of the spending conditions that should be verified on-chain.

https://preview.redd.it/piogz0v9ssv41.png?width=1614&format=png&auto=webp&s=e1b503a635ad3d138ef91e2f0c3b726e78958646
Let's discuss the FlowCard diagram and the logic of each transaction in details:
Buy Order Transaction
A buyer creates a Buy Order transaction. The transaction spends E amount of ERGs (which we will write E: ERG ) from one or more boxes in the pk(buyer) wallet. The transaction creates a bid box with ergAmt: ERG protected by the buyOrder script. The buyOrder script is synthesized from the specification (see below at “From Diagrams To ErgoScript Contracts”) either manually or automatically by a tool. Even though we don't need to define the buyOrder script explicitly during designing, at run time the bid box should contain the buyOrder script as the guarding proposition (which checks the box spending conditions), otherwise the conditions specified in the diagram will not be checked.
The change box is created to make the input and output sums of the transaction balanced. The transaction fee box is omitted because it can be added automatically by the tools. In practice, however, the designer can add the fee box explicitly to the a diagram. It covers the cases of more complex transactions (like Swap) where there are many ways to pay the transaction fee.
Cancel Buy, Cancel Sell Transactions
At any time, the buyer can cancel the order by sending CancelBuy transaction. The transaction should satisfy the guarding buyOrder contract which protects the bid box. As you can see on the diagram, both the Cancel and the Swap transactions can spend the bid box. When a box has spending alternatives (or spending paths) then each alternative is identified by a unique name prefixed with ! (!cancel and !swap for the bid box). Each alternative path has specific spending conditions. In our example, when the Cancel Buy transaction spends the bid box the ?buyer condition should be satisfied, which we read as “the signature for the buyer address should be presented in the transaction”. Therefore, only buyer can cancel the buy order. This “signature” condition is only required for the !cancel alternative spending path and not required for !swap .
Sell Order Transaction
The Sell Order transaction is similar to the BuyOrder in that it deals with tokens in addition to ERGs. The transaction spends E: ERG and T: TID tokens from seller's wallet (specified as pk(seller) contract). The two outputs are ask and change . The change is a standard box to balance transaction. The ask box keeps tAmt: TID tokens for the exchange and minErg: ERG - the minimum amount of ERGs required in every box.
Swap Transaction
This is a key transaction in the DEX dApp scenario. The transaction has several spending conditions on the input boxes and those conditions are included in the buyOrder and sellOrder scripts (which are verified when the transaction is added to the blockchain). However, on the diagram those conditions are not specified in the bid and ask boxes, they are instead defined in the output boxes of the transaction.
This is a convention for improved usability because most of the conditions relate to the properties of the output boxes. We could specify those properties in the bid box, but then we would have to use more complex expressions.
Let's consider the output created by the arrow labeled with [email protected] . This label tells us that the output is at the index 0 in the OUTPUTS collection of the transaction and that in the diagram we can refer to this box by the buyerOut name. Thus we can label both the box itself and the arrow to give the box a name.
The conditions shown in the buyerOut box have the form bid ? condition , which means they should be verified on-chain in order to spend the bid box. The conditions have the following meaning:
  • tAmt: TID requires the box to have tAmt amount of TID token
  • R4 == bid.id requires R4 register in the box to be equal to id of the bid box.
  • script == buyer requires the buyerOut box to have the script of the wallet where it is located on the diagram, i.e. pk(buyer)
Similar properties are added to the sellerOut box, which is specified to be at index 1 and the name is given to it using the label on the box itself, rather than on the arrow.
The Swap transaction spends two boxes bid and ask using the !swap spending path on both, however unlike !cancel the conditions on the path are not specified. This is where the bid ? and ask ? prefixes come into play. They are used so that the conditions listed in the buyerOut and sellerOut boxes are moved to the !swap spending path of the bid and ask boxes correspondingly.
If you look at the conditions of the output boxes, you will see that they exactly specify the swap of values between seller's and buyer's wallets. The buyer gets the necessary amount of TID token and seller gets the corresponding amount of ERGs. The Swap transaction is created when there are two matching boxes with buyOrder and sellOrder contracts.

From Diagrams To ErgoScript Contracts

What is interesting about FlowCard specifications is that we can use them to automatically generate the necessary ErgoTree scripts. With the appropriate tooling support this can be done automatically, but with the lack of thereof, it can be done manually. Thus, the FlowCard allows us to capture and visually represent all of the design choices and semantic details of an Ergo dApp.
What we are going to do next is to mechanically create the buyOrder contract from the information given in the DEX flow card.
Recall that each script is a proposition (boolean valued expression) which should evaluate to true to allow spending of the box. When we have many conditions to be met at the same time we can combine them in a logical formula using the AND binary operation, and if we have alternatives (not necessarily exclusive) we can put them into the OR operation.
The buyOrder box has the alternative spending paths !cancel and !swap . Thus the ErgoScript code should have OR operation with two arguments - one for each spending path.
/** buyOrder contract */ { val cancelCondition = {} val swapCondition = {} cancelCondition || swapCondition } 
The formula for the cancelCondition expression is given in the !cancel spending path of the buyOrder box. We can directly include it in the script.
/** buyOrder contract */ { val cancelCondition = { buyer } val swapCondition = {} cancelCondition || swapCondition } 
For the !swap spending path of the buyOrder box the conditions are specified in the buyerOut output box of the Swap transaction. If we simply include them in the swapCondition then we get a syntactically incorrect script.
/** buyOrder contract */ { val cancelCondition = { buyer } val swapCondition = { tAmt: TID && R4 == bid.id && @contract } cancelCondition || swapCondition } 
We can however translate the conditions from the diagram syntax to ErgoScript expressions using the following simple rules
  1. [email protected] ==> val buyerOut = OUTPUTS(0)
  2. tAmt: TID ==> tid._2 == tAmt where tid = buyerOut.tokens(TID)
  3. R4 == bid.id ==> R4 == SELF.id where R4 = buyerOut.R4[Coll[Byte]].get
  4. script == buyer ==> buyerOut.propositionBytes == buyer.propBytes
Note, in the diagram TID represents a token id, but ErgoScript doesn't have access to the tokens by the ids so we cannot write tokens.getByKey(TID) . For this reason, when the diagram is translated into ErgoScript, TID becomes a named constant of the index in tokens collection of the box. The concrete value of the constant is assigned when the BuyOrder transaction with the buyOrder box is created. The correspondence and consistency between the actual tokenId, the TID constant and the actual tokens of the buyerOut box is ensured by the off-chain application code, which is completely possible since all of the transactions are created by the application using FlowCard as a guiding specification. This may sound too complicated, but this is part of the translation from diagram specification to actual executable application code, most of which can be automated.
After the transformation we can obtain a correct script which checks all the required preconditions for spending the buyOrder box.
/** buyOrder contract */ def DEX(buyer: Addrss, seller: Address, TID: Int, ergAmt: Long, tAmt: Long) { val cancelCondition: SigmaProp = { buyer } // verify buyer's sig (ProveDlog) val swapCondition = OUTPUTS.size > 0 && { // securing OUTPUTS access val buyerOut = OUTPUTS(0) // from [email protected] buyerOut.tokens.size > TID && { // securing tokens access val tid = buyerOut.tokens(TID) val regR4 = buyerOut.R4[Coll[Byte]] regR4.isDefined && { // securing R4 access val R4 = regR4.get tid._2 == tAmt && // from tAmt: TID R4 == SELF.id && // from R4 == bid.id buyerOut.propositionBytes == buyer.propBytes // from script == buyer } } } cancelCondition || swapCondition } 
A similar script for the sellOrder box can be obtained using the same translation rules. With the help of the tooling the code of contracts can be mechanically generated from the diagram specification.

Conclusions

Declarative programming models have already won the battle against imperative programming in many application domains like Big Data, Stream Processing, Deep Learning, Databases, etc. Ergo is pioneering the declarative model of dApp development as a better and safer alternative to the now popular imperative model of smart contracts.
The concept of FlowCard shifts the focus from writing ErgoScript contracts to the overall flow of values (hence the name), in such a way, that ErgoScript can always be generated from them. You will never need to look at the ErgoScript code once the tooling is in place.
Here are the possible next steps for future work:
  1. Storage format for FlowCard Spec and the corresponding EIP standardized file format (Json/XML/Protobuf). This will allow various tools (Diagram Editor, Runtime, dApps etc) to create and use *.flowcard files.
  2. FlowCard Viewer, which can generate the diagrams from *.flowcard files.
  3. FlowCard Runtime, which can run *.flowcard files, create and send transactions to Ergo network.
  4. FlowCard Designer Tool, which can simplify development of complex diagrams . This will make designing and validation of Ergo contracts a pleasant experience, more like drawing rather than coding. In addition, the correctness of the whole dApp scenario can be verified and controlled by the tooling.
submitted by eleanorcwhite to btc [link] [comments]

[How-To] Crafting an offline TXN with the trezorlib python API

With the rollout of the new 0.12.0 API, I thought it might be time to update some of my old offline_txn scripts. The following is about 80 lines of python that will craft and sign a VERY simple transaction on Testnet.
The new rollout also comes with some new tools. The build_tx.py that is useful in conjunction with the trezorctl sign_tx command.
Both of the methods below will produce a signed TXN that can then be imported into Electrum using the "Tools -> Load transaction -> From text" command.
Note: u/Crypto-Guide has a good walkthrough for installing trezorlib in Windows if you haven't already done that.

Example of using trezorctl btc sign-tx

This example uses the build_tx.py script to build JSON to feed to the sign-tx command. You will need to download the build_tx.py file from github. It is not automatically installed with the trezor package.
```

python build_tx.py | trezorctl btc sign-tx -

Coin name [Bitcoin]: Testnet Blockbook server [btc1.trezor.io]: tbtc1.trezor.io
Previous output to spend (txid:vout) []: e294c4c172c3d87991...060fad1ed31d12ff00:0 BIP-32 path to derive the key: m/84'/1'/0'/0/0 Input amount: 129999866 Sequence Number to use (RBF opt-in enabled by default) [4294967293]: Input type (address, segwit, p2shsegwit) [segwit]:
Previous output to spend (txid:vout) []:
Output address (for non-change output) []: 2MsiAgG5LVDmnmJUPnYaCeQnARWGbGSVnr3 Amount to spend (satoshis): 129999706
Output address (for non-change output) []: BIP-32 path (for change output) []: Transaction version [2]: Transaction locktime [0]: Please confirm action on your Trezor device.
Signed Transaction: 0200000000010100ff121dd31ead0f06...f279b642d85c48798685f86200000000 ```

Example of using crafting a TXN using trezorlib directly

If your good with python, or want to see how everything works under the hood, here's 80 lines of python to generate a similar signed transaction.
```python

!/usbin/env python3

[repo] https://github.com/brianddk/reddit ... python/offline_txn.py

[req] pip3 install trezor

from trezorlib import btc, messages as proto, tools, ui from trezorlib import MINIMUM_FIRMWARE_VERSION as min_version from trezorlib.client import TrezorClient from trezorlib.transport import get_transport from trezorlib.btc import from_json from json import loads from decimal import Decimal from sys import exit

Tested with SLIP-0014 allallall seed (slip-0014.md)

User Provided Fields; These are pulled from test scripts

CHANGE THESE!!!

coin = "Testnet"

Get legacy UTXO prev_txn hex from blockbook server. For example:

https://tbtc1.trezor.io/api/tx-specific/ \

e294c4c172c3d87991b0369e45d6af8584be92914d01e3060fad1ed31d12ff00

in1_prev_txn_s = '{"txid":' \ '"e294c4c172c3d87991b0369e45d6af8584be92914d01e3060fad1ed31d12ff00"}'
in1_prev_index = 0 in1_addr_path = "m/84'/1'/0'/0/0" # allallall seed in1_amount = 129999867 out1_address = "2MsiAgG5LVDmnmJUPnYaCeQnARWGbGSVnr3" out1_amount = in1_amount - 192

Defaults

tx_version = 2 tx_locktime = 0 sequence = 4294967293

Code

in1_prev_txn_j = loads(in1_prev_txn_s, parse_float=Decimal) in1_prev_hash = in1_prev_txn_j['txid'] in1_prev_hash_b = bytes.fromhex(in1_prev_hash) device = get_transport() client = TrezorClient(transport=device, ui=ui.ClickUI())
fw_version = (client.features.major_version, client.features.minor_version, client.features.patch_version) if fw_version < min_version[client.features.model]: print("Please flash to the latest FW") exit(1)
signtx = proto.SignTx( version = tx_version, lock_time = tx_locktime )
ins = [proto.TxInputType( address_n=tools.parse_path(in1_addr_path), prev_hash=in1_prev_hash_b, prev_index=in1_prev_index, amount=in1_amount, script_type=proto.InputScriptType.SPENDWITNESS, sequence=sequence )] outs = [proto.TxOutputType( address=out1_address, amount=out1_amount, script_type=proto.OutputScriptType.PAYTOADDRESS )]
txes = None for i in ins: if i.script_type == proto.InputScriptType.SPENDADDRESS: tx = from_json(in1_prev_txn_j) txes = {in1_prev_hash_b: tx} break
_, serialized_tx = btc.sign_tx(client, coin, ins, outs, details=signtx, prev_txes=txes) client.close() print(f'{{"hex": "{serialized_tx.hex()}"}}') ```
From here, you simple take the resultant TXN hex and import it into Electrum using the "Tools -> Load transaction -> From text" clickpath
submitted by brianddk to TREZOR [link] [comments]

Bitcoin Support Phone Number+1【888417≣32O9】⚡️Bitcoin Phone Number Bitcoin Support Number Bitcoin Support Phone Number Bitcoin Toll Free Phone Number

Bitcoin billing mail has been launched for fulfilling requirement of checking the mails through any device. It has made easy for the users to access the account from even a simple computer. With this mail account you can simply “Sign-In” in your account by putting the email address and the password. Once you “Sign In” you can check the activity of your mail account. You can compose, read the incoming mail and also download the large file attachments.















Majority of people has been registered with Bitcoin premium email account because it is completely different from other mail accounts with number of favorable qualities available in it. It is currently considered as one of the lead