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Yes. A wallet can show a transaction clearly or simulate it accurately and a trade can still go badly: the signed request may differ from what the user intended, or market conditions may change before execution. Ethereum Foundation researchers propose native transaction assertions that could check selected results after a transaction runs and revert its actions if a rule fails. But EIP-7906 is a proposal, not a universal safeguard, and it only helps when a trusted wallet or protocol supplies and requires a suitable rule.
Why a valid signature can still lead to a bad trade
A signature authorizes a particular request; it does not guarantee that the request matches the user’s intent or that its eventual outcome will meet the user’s goal. Ethereum executes the signed request against the code and state present when it is included. A proxy’s implementation can change after review, and transaction ordering can move a market before execution. A sandwich attack, for example, can shift a pool price without changing the signed transaction.
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Intent mismatch
The transaction presented for signing may be different from what the user believes they are approving. The Ethereum Foundation’s October 5, 2026 account points to Bybit, where signers authorized replacing a Safe implementation contract, and BadgerDAO, where users granted an attacker token-spending permission after a compromised frontend supplied a different signing request. A readable display helps only if it accurately describes the request and the user can recognize the difference.
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The user may approve the request shown, but the bounds in that request or the state at execution may still permit an outcome contrary to their economic goal. The Foundation describes an Aave and CoW collateral swap in which a user tried to exchange about $50.4 million in aEthUSDT for aEthAAVE. AAVE liquidity was too thin; CoW’s gas ceiling rejected more complex quotes during verification, leaving a verified quote of roughly 329 aEthAAVE. The interface displayed a 99.9 percent price-impact warning and required confirmation that the entire value could be lost. The signer proceeded and received tokens worth about $36,000. These are the Foundation’s figures for this incident, not general market statistics.
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What clear signing and simulation can—and cannot—do
Clear signing makes intent easier to inspect
Clear Signing aims to turn transaction data into a human-readable description. Its usefulness depends on accurate decoding, trustworthy description sources and the user noticing a mismatch. In a May 12, 2026 announcement, the Ethereum Foundation described ERC-7730 as a shared format for transaction descriptions, supported by a registry, independent review and attestations, with wallets choosing which sources to trust. The descriptions accompany transactions; they are not embedded in them. The Foundation said that “What You See Is What You Sign” must be the goal and Clear Signing must be the default on Ethereum. Read the Foundation’s Clear Signing announcement.
Simulation predicts; it does not bind execution
A simulation estimates effects against a selected chain state. That state can change before inclusion, and the transaction ultimately signed can differ from the simulated one. The Foundation cites Radiant Capital as a case where the wallet and simulation showed the intended transaction while malware on signers’ devices replaced the payload at signing time. A simulation is useful evidence about a particular request and state, not an execution-time guarantee.
Guards enforce only the conditions they know to check
Existing contract and wallet mechanisms can enforce selected conditions during execution. Uniswap’s amountOutMinimum, for example, sets a minimum acceptable output; Safe’s checkAfterExecution hook lets a guard inspect account state and revert when configured rules are violated. These mechanisms must anticipate which properties matter. They may rely on functions a contract exposes: a proxy may not expose its implementation address through a function, and a guard cannot directly inspect that storage slot without an interface. A guard checking one balance also cannot see every other net state change.
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What EIP-7906 proposes checking
The Ethereum Foundation presents EIP-7906 as one possible design, built on frame transactions proposed by EIP-8141. A frame transaction has ordered validation and action steps. EIP-7906 would add a read-only POST_TX frame after those steps to inspect the transaction’s outcome. The rule could travel with the actions and be signed alongside them. It might specify, for example, a minimum amount received, a spending cap, an approval restriction or a requirement that account-control logic remain unchanged.
The proposed inspection covers net differences rather than every intermediate write. It would make available changes in native ETH balances and storage, newly deployed contracts and code hashes, and emitted events. Multiple writes to one storage slot would appear as a single starting-to-final entry; a slot restored to its original value would be omitted. Three proposed opcodes provide access:
TXTRACEenumerates net state changes and events.TXDIFFretrieves starting and final values for specified addresses and storage slots.EVENTDATACOPYcopies event data into memory.
These opcodes would run only in the read-only POST_TX frame. If an assertion failed, the execution body would revert, but the transaction would remain in the block as failed and its gas payer would still be charged for the gas consumed. The Foundation’s October 5, 2026 article said EIP-8141 was scheduled for Hegotá and EIP-7906 had advanced to “Considered for Inclusion,” not that it was confirmed for that upgrade. Check the Foundation’s proposal and status description; those status details are as of its publication date.
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Why an assertion could still let a bad trade through
The transaction may have no assertion
EIP-7906 does not require every transaction to include an assertion. A wallet constructing a user’s frame transaction would need to include the needed check. A protocol that wants to protect every caller would need to require the exact assertion and reject ordinary transactions or frame transactions with a missing or incorrect one. An immutable contract already deployed cannot add that requirement after the fact.
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The rule may be wrong or supplied by an attacker
An assertion enforces the rule it receives; it does not establish that the rule reflects the user’s intent. A compromised frontend could supply a permissive rule that lets its attack succeed. The rule needs to come from independently approved user intent, a standing account policy, or protocol logic the compromised component cannot change. As the Foundation puts it, “The rule’s source matters as much as the check itself.”
The assertion protects only its defined scope
A minimum-output check, spending cap, approval restriction and account-control restriction protect different properties. A rule that checks one result does not automatically constrain unrelated balances, storage changes or permissions. Broader visibility into net changes does not by itself make the rule broad or correct; the assertion must inspect and reject the outcomes that matter.
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One transaction is not a cross-chain guarantee
The Foundation’s described solver guarantee would apply within one transaction on one network. It would not guarantee a route spanning multiple chains, where separate executions and conditions are involved.
Cost and design remain unresolved
The proposal’s search result warns that checking state differences could require significant gas in the worst case, and flags upgradeable assertion contracts as a possible bypass risk if a malicious transaction can upgrade the checker during execution. The Foundation also identifies the exposed information, access method and permitted execution locations as open design choices. These are proposal-level concerns, not measured deployment results.
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How to judge a trade safeguard
When evaluating a wallet, protocol or transaction flow, separate where enforcement happens from what it covers. A readable display can help reveal intent; a simulation can estimate a result against a particular state; a guard can enforce configured checks during execution; a post-action assertion could inspect defined net changes and events. None is interchangeable with the others.
| Safeguard | Where it acts | What it can cover | Key limitation |
|---|---|---|---|
| Clear signing | Before signing | A human-readable description of the request | Depends on accurate decoding, trusted description sources and user review; does not enforce an outcome |
| Simulation | Before execution | Predicted effects against a selected chain state | State can change before inclusion, and the signed payload can differ |
| Contract or wallet guard | During execution | Configured conditions on accessible state or exposed functions | Scope and interfaces limit what it can inspect |
| Proposed transaction assertion | After actions in a read-only frame | Rules over available net changes and events | Optional in the proposal; rule source, scope, cost and design matter |
For any protection, ask who supplies the rule, whether it is mandatory, which state or outcome it checks, and whether its guarantee covers one transaction or a multi-chain workflow. A separate signing device can provide another place to double-check details for higher-risk use, as the Foundation suggests, but it does not by itself prevent a bad trade; confirm a device’s current documentation before relying on a particular feature.
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