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 on-chain, 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 |