NodeInterface reference
The Arbitrum Nitro software includes a special NodeInterface contract available at address 0xc8 that is only accessible via RPCs (it's not actually deployed onchain, and thus can't be called by smart contracts). This reference page documents the specific calls available in the NodeInterface. For a more conceptual description of what it is and how it works, please refer to the NodeInterface conceptual page.
NodeInterface methods
| Method | Solidity interface | Go implementation | Description |
|---|---|---|---|
| Interface | Implementation | Estimates the gas needed for a retryable submission |
constructOutboxProof(uint64 size, uint64 leaf) | Interface | Implementation | Constructs an outbox proof of an l2->l1 send's existence in the outbox accumulator |
findBatchContainingBlock(uint64 blockNum) | Interface | Implementation | Finds the L1 batch containing a requested L2 block, reverting if none does |
getL1Confirmations(bytes32 blockHash) | Interface | Implementation | Gets the number of L1 confirmations of the sequencer batch producing the requested L2 block |
gasEstimateComponents(address to, bool contractCreation, bytes calldata data) | Interface | Implementation | Same as native gas estimation, but with additional info on the l1 costs |
gasEstimateL1Component(address to, bool contractCreation, bytes calldata data) | Interface | Implementation | Estimates a transaction's l1 costs |
legacyLookupMessageBatchProof(uint256 batchNum, uint64 index) | Interface | Implementation | Returns the proof necessary to redeem a message |
nitroGenesisBlock() | Interface | Implementation | Returns the first block produced using the Nitro codebase |
blockL1Num(uint64 l2BlockNum) | Interface | Implementation | Returns the L1 block number of the L2 block |
l2BlockRangeForL1(uint64 blockNum) | Interface | Implementation | Finds the L2 block number range that has the given L1 block number |