eth_getProof

eth_getProof returns an account's core fields on the Avalanche C-Chain — balance (in AVAX wei), nonce, codeHash, and storageHash — together with Merkle-Patricia trie proofs for the account and for any storage slots you request. The proofs let a verifier check that the values truly belong under the block's stateRoot without trusting the RPC node, which is the foundation for light clients and cross-chain bridges over the C-Chain. Call it against https://avalanche.therpc.io/YOUR_API_KEY (chain ID 43114, 0xa86a) with an address, a list of storage keys (possibly empty), and a block tag.

Use cases

• Verify C-Chain account balances or storage values trustlessly inside a light client or a bridge contract that only holds Avalanche block headers.
• Build fraud proofs or validity proofs for dispute resolution in subnet- or L2-style systems anchored to the C-Chain.
• Supply state-witness data for stateless-client experiments that execute without a full state database.
• Audit a token's supply by proving a specific storage slot value against a known C-Chain block hash and stateRoot.

Parameters

Response

Example request

1curl https://avalanche.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 Avalanche playground.

Errors & troubleshooting

Common pitfalls

• Verifying the response means implementing Merkle-Patricia trie traversal yourself; if you do not need trustless verification, eth_getStorageAt returns the raw value far more simply.
• Proofs at an older block require an archive node, or at least one that still retains state for the requested C-Chain height; pruned nodes return a missing-trie-node error.
• A proof is only meaningful once you check the accountProof root against the stateRoot from that block's header — the proof alone proves nothing without the trusted header.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• eth_getStorageAt
• eth_getCode
• eth_getBalance

1curl https://avalanche.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",[],""]}'