SEISMIC_TX_TYPE

Transaction type byte for Seismic transactions

Protocol constant representing the transaction type byte for Seismic custom transactions.

Overview

SEISMIC_TX_TYPE is the EIP-2718 transaction type identifier used by Seismic's custom transaction format. This byte prefixes all serialized Seismic transactions.

Value

Representation	Value
Hexadecimal	0x4A
Decimal	74

Definition

SEISMIC_TX_TYPE: int = 0x4A

EIP-2718 Context

EIP-2718 introduced typed transaction envelopes to Ethereum. Transaction types are identified by a single byte prefix:

Type	Description
0x00	Legacy transactions (pre-EIP-2718)
0x01	EIP-2930 (Access lists)
0x02	EIP-1559 (Dynamic fee)
0x03	EIP-4844 (Blob transactions)
0x04	EIP-7702 (Set EOA account code)
0x4A	Seismic custom transactions

Transaction Format

A serialized Seismic transaction has the format:

[0x4A] + RLP([chainId, nonce, gasPrice, gas, to, value, data, ...])

Where 0x4A is the SEISMIC_TX_TYPE prefix.

Protocol Notes

• The SDK automatically sets this type for all shielded writes

• Seismic nodes recognize and process transactions with this type

• Standard Ethereum nodes will reject transactions with unknown types

• This type is part of the Seismic protocol specification

See Also

• UnsignedSeismicTx - Seismic transaction structure

• sign_seismic_tx_eip712 - Transaction signing

• ChainConfig - Chain configuration with chain IDs

• Shielded Write Guide - Guide to sending Seismic transactions