EIP-1898 Support

[infloop]

Hi!

Do you have plans to have support for EIP-1898 (https://eips.ethereum.org/EIPS/eip-1898)? I'd like to create a PR for that.

Although this EIP is marked as stagnant, it is widely supported by most clients and actively used in production to retrieve deterministic state from Ethereum RPCs. It enables clients to unambiguously specify the block they want to query for certain RPC methods.

RPC methods affected by EIP-1898:

eth_getBalance
eth_getStorageAt
eth_getTransactionCount
eth_getCode
eth_call
eth_getProof

Examples

Before EIP-1898:

{
  "method": "eth_getBalance",
  "params": ["0x8D97689C9818892B700e27F316cc3E41e17fBeb9", "0xf65631529d476553ca5b0056d6480c3970dd5ac884fee51d5b30ca7fceab8894"],
  "id": "42",
  "jsonrpc": "2.0"
}

{
  "method": "eth_getBalance",
  "params": ["0x8D97689C9818892B700e27F316cc3E41e17fBeb9", "0x1482fbb"],
  "id": "42",
  "jsonrpc": "2.0"
}

After EIP-1898:

{
  "method": "eth_getBalance",
  "params": ["0x8D97689C9818892B700e27F316cc3E41e17fBeb9", {
    "blockHash": "0xf65631529d476553ca5b0056d6480c3970dd5ac884fee51d5b30ca7fceab8894"
  }],
  "id": "42",
  "jsonrpc": "2.0"
}

{
  "method": "eth_getBalance",
  "params": ["0x8D97689C9818892B700e27F316cc3E41e17fBeb9", {
    "blockNumber": "0x1482fbb"
  }],
  "id": "42",
  "jsonrpc": "2.0"
}

Usage

const url = '...';
const transport = http(url);
const client = createPublicClient({
  chain: mainnet,
  transport: transport,
});

const balance = await client.getBalance({ 
  address: '0x8D97689C9818892B700e27F316cc3E41e17fBeb9', 
  blockTag: { blockHash: '0xf65631529d476553ca5b0056d6480c3970dd5ac884fee51d5b30ca7fceab8894' }
}),

Extra

Clients and services that support EIP-1898:

• Geth: internal/ethapi: support block number or hash on state-related methods ethereum/go-ethereum#19491
• Besu: [Content] some RPC methods now support blockhash param hyperledger/besu-docs#1242
• Erigon: Json rpc eip1898 correctness erigontech/erigon#2736
• Nethermind (except blockNumber): EIP-1898 support? NethermindEth/nethermind#3426, Better EIP-1898 support NethermindEth/nethermind#5025
• Infura: https://docs.metamask.io/services/reference/scroll/json-rpc-methods/#block-identifier
• Alchemy: https://docs.alchemy.com/reference/eth-call#parameters

Other links:
ethers-io/ethers.js#2808