Credibly predict oracles. Project for Chainlink Hackathon Spring 2022

• Video guide
• Example PredictionRecorder for ETH/USD on Rinkeby

• Video guide
• Example InvitationalBet for the above PredictionRecorder

This work is mostly a single Solidity file: PredictionRecorder.sol. You can deploy two contracts and verify their source codes. Then you can interact with the deployed contracts using any Web3 provider.

hdwallet-provider is for authentication and truffle-plugin-verify is for verifying source codes that contain imports.

npm install @truffle/hdwallet-provider
npm install -D truffle-plugin-verify

In the truffle folder you need two files to locally configure authentication credentials.

• create a .env file to hold INFURA_PROJECT_ID and ETHERSCAN_API_KEY.
• create a .secret fild to hold mnenomics (space-separated words, typically 12 of them) that generate your HDWallet.

To deploy PredictionRecorder or InvitationalBet, modify the comments in migrations.js.

• for PredictionRecorder, you need to set the target oracle address. Note that this can vary between different networks.
• for InvitationalBet, you need to set the PredictionRecorder address, invited participants, and timeframe / watermark parameters.

When your deployment parameters are ready, do

truffle deploy --network rinkeby
truffle run verify <either-PredictionRecorder-or-InvitationalBet> --network rinkeby

Secure original predictions need encryption, decryption, and watermarks, which we suggest managing programmatically. For instance, you can consider taking a look at the python folder to use credict-py. It takes care of RSA encryption and watermarks.