eth_getProof

eth_getProof returns an account's core fields — balance in ETH wei, nonce, codeHash, storageHash — together with Merkle-Patricia trie proofs for the account and for any storage slots you list, all on Arbitrum One. Because Arbitrum One (chain ID 42161) is an Optimistic Rollup whose state settles to Ethereum L1, these proofs are the building block for trustless cross-domain verification. Call it at https://arbitrum.therpc.io/YOUR_API_KEY with an address, an array of storage keys, and a block tag, and it returns the account fields plus the accountProof and storageProof trie-node arrays needed to verify them against the block's state root.

Use cases

• Verify Arbitrum One account or storage state trustlessly inside a light client or a bridge contract on L1.
• Supply witness data when constructing fraud proofs for the Optimistic Rollup's L1 dispute and challenge process.
• Feed state-witness data into stateless-client experiments that reconstruct state without a full archive.
• Audit a token's supply or a balance by proving a specific storage slot value against a known Arbitrum block's state root.

Parameters

Response

Example request

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_getProof",
7    "params": [
8        "0x0000000000000000000000000000000000000000",
9        [],
10        "latest"
11      ],
12    "id": 1
13  }'

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• Checking a proof means implementing Merkle-Patricia trie traversal yourself; if you do not need trustless verification, raw values from eth_getStorageAt are far simpler.
• The query needs an archive node, or at least one that still retains state for the requested Arbitrum block; against a pruned node an old block returns a missing-trie-node error.
• A proof is meaningless until its root is checked against the stateRoot from that block's header — fetch the header (e.g. via eth_getBlockByNumber) and verify the accountProof resolves to it.

Supported networks

• Mainnet — Chain ID: 42161
• Sepolia — Chain ID: 421614

See also

• eth_getStorageAt
• eth_getCode
• eth_getBalance

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getProof","params":["0x0000000000000000000000000000000000000000",[],""]}'