Dice Game Web3 example NodeJS on SmartHoldem blockchain

Simple example dice game on SmartHoldem blockchain.

What does this example demonstrate?

• no centralized server or static IP required
• no vulnerable smart contracts
• connection to the blockchain
• storage of game statistics
• selection of winners
• getting a random number from the blockchain
• sending STH to the winner
• receiving game transactions

Requirements

• NodeJS 18+
• OS Windows, Linux or MacOS

Rules for players

Double your bet by guessing a random number, less than 127 or greater than 128. The game does not have its own UI and works through the SmartHoldem wallet https://wallet.smartholdem.io

To participate in the game, simply send a bet from 2 to 500 to the game bank address SRcse8VH9uqC4DterMfghvtaHdLhHJ9Gi2 and set memo with one symbol + (plus) equivalent > 128 or - (minus) equivalent < 127. the bet is played in the block in which your transaction fell.

• min bet 2 STH

• max bet 1000 STH

• symbol - = bet <127

• symbol + = bet >128 (example with memo https://explorer.smartholdem.io/#/transaction/22de7a868deb6f97ffd158d608d5806dc7f8c52529bfc66f2c37375c8d7c02d1)

• Dice trtansactions in https://wallet.smartholdem.io

• bet 10 STH on number < 127 from wallet

• bet 10 STH on number > 128 from wallet

Verify

To check the blockchain random winning number you can also use https://hasher.smartholdem.io/#/hex-to-bytes

Just copy the Block ID of your transaction is example https://explorer.smartholdem.io/#/transaction/22de7a868deb6f97ffd158d608d5806dc7f8c52529bfc66f2c37375c8d7c02d1

Block ID 8eed48eeeef803c10c7107f89cbaf76efa6aae500ad3bf2378919afc70f5eef8

and paste hash in https://hasher.smartholdem.io/#/hex-to-bytes

the first number received is the result of the drawing, example 142

How it works for developers

• Random numbers are produced by the blockchain as a hexadecimal block hash sequence
• Every 10 seconds the application checks for new game transactions
• rename config.json.example to config.json
• enter in config.json your gameBankAddress SmartHoldem Address example: SRcse8VH9uqC4DterMfghvtaHdLhHJ9Gi2
• enter gameBankSecret phrase for Game Bank Address in config.json for payments winners
• file successTxs.json stores old transactions to avoid duplication

Run:

git clone https://github.com/smartholdem/dice-game-example.git
cd dice-game-example
npm install
node index.js

Run in background mode:

npm install -g forever
forever start index.js
forever list
forever stop index.js // stop script