/blockhash-example

Primary LanguageSolidity

LayerZero Blockhash Omnichain example

Install

yarn install

Deployment

prepare a new wallet that never send tx on any chain before, in order to keep all contracts with the same address on all chains.

BlockHashSend.sol - an omnichain way to send a blockhash across chains

BlockHashReceive.sol - an omnichain way to receive and store a blockhash

WARNING: You must perform the setTrustedRemote() (step 3).

  1. Fill out .env:
MNEMONIC="test test test test test test test test test test test test"
  1. Deploy two contracts:
$ npx hardhat --network bsc-testnet deploy --tags BlockHashSend
$ npx hardhat --network fuji deploy --tags BlockHashReceive
  1. Set the "trusted remotes" (ie: your contracts) so each of them can receive messages from one another, and only one another.
$ npx hardhat --network bsc-testnet setTrustedRemote --target-network bsc-testnet --src-contract-name BlockHashSend --dst-contract-name BlockHashSend 
$ npx hardhat --network bsc-testnet setTrustedRemote --target-network fuji --src-contract-name BlockHashSend --dst-contract-name BlockHashReceive 
$ npx hardhat --network fuji setTrustedRemote --target-network bsc-testnet --src-contract-name BlockHashReceive --dst-contract-name BlockHashSend
  1. Send a loop back from bsc-testnet to bsc-testnet containing the block number. Then on lzReceive in bsc-testnet, use the block number to get the blockhash and then send to fuji. When fuji gets the transaction it will store it into an array.
$ npx hardhat --network bsc-testnet sendBlockNumber --target-network fuji
  1. On fuji check that the blockhash is stored in the contract.
$ npx hardhat --network fuji getBlockHash
  1. On bsc-testnet get the block using the blockhash
$ npx hardhat --network bsc-testnet getBlock --blockhash BLOCKHASH