pyth-network_pyth-crosschain/target_chains/ethereum/examples/coin_flip

Coin Flip Example application

The coin flip example demonstrates how to use Pyth Entropy to flip a fair coin.

Try it out

To try the example, first run the following commands from the root of the pyth-crosschain repository:

pnpm i
pnpm exec lerna run build

These commands will build dependencies for the typescript project.

Next, choose a network to run the example on. The example has been deployed on the following networks:

| Chain Name       | Address                                    | RPC                                        |
|------------------|--------------------------------------------|--------------------------------------------|
| optimism-sepolia | 0x2eE67fF5d8548fF544f2c178a0FcAFe503A634Be | https://sepolia.optimism.io/               |
| arbitrum-sepolia | 0xCd76c50c3210C5AaA9c39D53A4f95BFd8b1a3a19 | https://sepolia-rollup.arbitrum.io/rpc     |

You will also need the private key of a wallet with some gas tokens for your chosen network. Then, from the coin_flip/app directory, run the following command:

npm run flip-coin -- \
  --private-key <hexadecimal evm private key> \
  --address <address> \
  --rpc-url <rpc url>

You can populate the arguments to this command from the table above. The command should print output like this:

Running coin flip prototcol.
1. Generating user's random number...
   number    : 0x7c94c33d424e0a683deb15b55cc7d40d5cc8154478c76c971b677c35e32cb2f4
2. Requesting coin flip...
   fee       : 101 wei
   tx        : 0x23e8e1c800d2e9c55d7e8bf1b2bd5e835979c1aa076f56ab4a74828a45684d9b
   sequence  : 37
3. Waiting for result...
   result    : Tails

Understanding the Example

The example consists of a Solidity contract and a Typescript script. See the extensive code comments in the contract at contract/src/CoinFlip.sol to learn how the example works. The typescript script is available at app/src/flip_coin.ts and demonstrates how to interact with the contract.