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EIP-8175 Composable Transaction

DraftCorecreated 2026-02-26requires EIP-2, EIP-1559, EIP-2718

An extensible EIP-2718 transaction type with separated signatures, fee delegation via fee_auth, and opcodes for signature introspection

Author: Dragan Rakita (@rakita)

Depends on (3)

Proposals this one names in its requires field.

EIP-2Homestead Hard-fork ChangesEIP-1559Fee market change for ETH 1.0 chainEIP-2718Typed Transaction Envelope

What the specification covers

AbstractMotivationSpecificationParametersComposable transactionCapability typesCALL (CAP_CALL = 0x01)CREATE (CAP_CREATE = 0x02)SignaturesSignature schemesSigning hashFee delegation via fee_authNew opcodesRETURNETH (0xf6)SIG (0xf7)SIGHASH (0xf8)TX_GAS_LIMIT (0xf9)Execution orderGas handlingRationaleLinear growth of transaction typesSeparating signatures from capabilitiesDomain-separated signing hashfee_auth for fee delegationUpfront maximum cost escrowfee_auth state persistenceRETURNETH opcodeSIG and SIGHASH opcodesTX_GAS_LIMIT opcodeCALL and CREATE as capabilitiesBackwards CompatibilitySecurity ConsiderationsSignature domain separationPayer replay protectionfee_auth execution safetyfee_auth griefingRETURNETH restrictionsTransaction propagationCopyright

This proposal declares no Solidity interface, so there is nothing to compute. It may be a core protocol change, a meta proposal, or written in prose only.

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