Common attributes

Attributes shared by every span or metric: the chain, the operation and error.type. Default is what is recorded without configuration; addresses follow the address mode described under privacy.

`blockchain.system.name`

Type	Spans	Default
string	send, confirm, payment	on

evm

`blockchain.chain.id`

Type	Spans	Default
int	all	on

EIP-155 chain id, e.g. 8453

`blockchain.operation.name`

Type	Spans	Default
string	send, confirm, payment	on

send | confirm | payment

`blockchain.operation.subject`

Type	Spans	Default
string	none (metrics only)	on

on metrics of user operations: user_operation; of call batches: call_batch; absent on those of transactions

`blockchain.fee.payer`

Type	Spans	Default
string	none (metrics only)	on

on blockchain.client.fee samples whose fee the sender of the traced transaction or operation did not pay: facilitator for a payment’s settlement transaction, paymaster for a user operation a paymaster paid for, sponsor for a transaction whose receipt names another account as its fee payer (a Tempo feePayer); a payment’s settlement keeps facilitator, also when its fee was sponsored; absent when the sender paid (ADR 0020)

`blockchain.fee.denomination`

Type	Spans	Default
string	none (metrics only)	on

on blockchain.client.fee samples whose fee was paid in a token rather than the chain’s native currency: token, a constant, never an address or a value read from the chain; set whenever blockchain.tx.fee_asset is known, in every address mode; absent for the native currency, Arc’s USDC included (ADR 0028)

`error.type`

Type	Spans	Default
string	all	on

see Span status; reused from OpenTelemetry general conventions