## Blockhash company comparison
Scope:
1- Deploy/call a smart contract that stores the blockhash from BLOCKHASH opcode

2- Check returned block hash from rpc call
3- Check block hash at explorers
4- Compute block hash from block header params:

  const rlp = ethers.utils.RLP.encode([
        res.parentHash,
        res.sha3Uncles,
        res.miner,
        res.stateRoot,
        res.transactionsRoot,
        res.receiptsRoot,
        res.logsBloom,
        formatNotOddData(res.difficulty),
        formatNotOddData(res.number),
        formatNotOddData(res.gasLimit),
        formatNotOddData(res.gasUsed),
        res.timestamp,
        res.extraData,
        res.mixHash,
        res.nonce,
        formatNotOddData(res.baseFeePerGas),// EIP 1559
        res.withdrawalsRoot // EIP 4895
    ]);
    const hash = ethers.utils.keccak256(rlp);

### Optimism
Block number: 17660461
BLOCKHASH opcode response: 0x02bb095abfc7440c951cf0fffc37384d908241976bcbed57c612485400883da0
BLOCKHASH in explorer: [0x02bb095abfc7440c951cf0fffc37384d908241976bcbed57c612485400883da0](https://goerli-optimism.etherscan.io/block/17660461)
BLOCKHASH RPC response:0x02bb095abfc7440c951cf0fffc37384d908241976bcbed57c612485400883da0
Computed BLOCKHASH: 0x02bb095abfc7440c951cf0fffc37384d908241976bcbed57c612485400883da0

### Arbitrum
Block number: 1465548 / 4755724
BLOCKHASH opcode response: 0x1db91e1e81fe0b483256e2b4b9489cbfbef19a5038107ba7dafdfbac6c80377c
BLOCKHASH in explorer: [0xbdccf08b3057b134990ca807c6a974d39befe2bfa56fe71e1f323959b1ac590c](https://sepolia-explorer.arbitrum.io/block/1465548/transactions)
BLOCKHASH RPC response:0xbdccf08b3057b134990ca807c6a974d39befe2bfa56fe71e1f323959b1ac590c
Computed BLOCKHASH: 0xbdccf08b3057b134990ca807c6a974d39befe2bfa56fe71e1f323959b1ac590c

### Scroll
Block number: 2369865
BLOCKHASH opcode response: 0xa7728333b701a8fa0bfbda57409adc45b60ee6ed9151811b50024a0210a8e8cb
BLOCKHASH in explorer: [
0x9cff7a85b1000facb396d4cfb378a0e0e2cadc46bec409d0ffcf89eaa697a6c7](https://sepolia.scrollscan.dev/block/2369865)
BLOCKHASH RPC response:0x9cff7a85b1000facb396d4cfb378a0e0e2cadc46bec409d0ffcf89eaa697a6c7
Computed BLOCKHASH: 0x9cff7a85b1000facb396d4cfb378a0e0e2cadc46bec409d0ffcf89eaa697a6c7