System columns

The columns every row carries without your asking, read with a $ in front of the name.

Column	Type	Holds
$chain	chain	the row's chain
$block	bigint	the block the row was answered at
$blockHash	bytes32	that block's hash
$timestamp	datetime	that block's timestamp
$address	address	the contract on a state row; the emitter on an event row
$sampleAt	datetime	on a sampled row, the boundary that selected it; null otherwise
$tx	bytes32	the transaction hash — event rows only
$txIndex	bigint	the transaction's index in the block — event rows only
$logIndex	bigint	the log's index in the block — event rows only
$event	string	the event's name — event rows only
$topics	bytes32[]	the log's topics as the node gave them, topic0 first — event rows only
$data	bytes	the log's undecoded data — event rows only

A state row has the first six. An event row has all twelve.

let stETH = ethereum:0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84;

from stETH at time '2026-09-20'..'2026-09-23' every 1d as s
| project { chain: $chain, block: $block, time: $timestamp, day: $sampleAt, contract: $address }

Open in workbench →

$block is a plain column: projecting it away changes nothing about which block a later call is answered at. Through an alias — s.$address, a.$block — a system column names one source's value when a join has put two side by side.

$storage

Not a column but a member of any address: s.$storage[slot] reads one 32-byte word of that contract's storage at the row's block. Read a storage slot.

See also

• Blocks and time — $timestamp against $sampleAt.