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Fast blocks, more blocks

At ten blocks per second, Robinhood Chain produces about 864,000 blocks a day. Two things follow:
  • Ranges are long. A day is about 864,000 blocks, so a one-day query spans about 18 responses at the 50,000-block page limit, even if it matches few rows. Your pagination loop handles this; just don’t be surprised by the page count.
  • Blocks are small. A block holds a few dozen transactions at most, and there are no empty blocks: each one has the ArbOS system transaction (below) and at least one user transaction.

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The ArbOS system transaction

Every Robinhood Chain block starts with an ArbOS “start block” transaction: type 0x6a, sent from 0x00000000000000000000000000000000000a4b05. A query for every transaction in a range returns one of these per block (except block 0, the genesis block, which has no transactions). A few blocks carry more than one, for example the batch-posting reports. To leave them out, filter on type: "type": [0, 1, 2, 4] keeps ordinary signed transactions and leaves out ArbOS’s type 106 (and Arbitrum’s other system and retryable types). Or filter on to/from/sighash so they never match.

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Arbitrum fields

On top of the base fields, Robinhood Chain fills these: The retryable fields are null on transaction types that don’t carry them. The six amounts (maxRefund, submissionFeeRefund, depositValue, retryValue, maxSubmissionFee, l1BaseFee) are full 256-bit values: 32 bytes big-endian in Arrow, decimal strings in JSON. A maxRefund of 2²⁵⁶ − 1 (“unlimited”) is 32 bytes of 0xff. See Data types. timeboosted is 1 when the transaction went through the Timeboost express lane. It is null when the chain’s nodes don’t report it, which is the case today.

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Fields Robinhood Chain doesn’t have

Arbitrum chains don’t produce withdrawals, blobs or the Prague block fields. These are always null and listed in unavailable_fields:
  • blocks: totalDifficulty, withdrawalsRoot, withdrawals, blobGasUsed, excessBlobGas, parentBeaconBlockRoot, requestsHash
  • transactions: maxFeePerBlobGas, blobVersionedHashes, blobGasUsed, blobGasPrice
OP-Stack fields are also null.

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Finality

A block is final once 64 newer blocks exist, about 6–7 seconds. Rows above finalized_block can be replaced by a reorg. See Finality and reorgs.

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Example: every ERC-20 transfer in 10 blocks

About 500 rows, 160 KB of JSON.