What a Failed Mantle Bridge Signature Means

A failed wallet signature usually means the bridge transaction was not authorized, but the message alone does not prove that nothing was submitted. A wallet may fail while signing, lose its connection after broadcasting, or show an error after the network has accepted a transaction. Check the sending account’s activity and the relevant chain explorer before retrying. The mantle bridge moves assets through separate on-chain steps, so the right recovery depends on which step reached the network.

What does “signature failed” mean on Mantle Bridge?

For a transaction, the wallet signs a specific set of fields that authorizes an action from your account. The wallet then submits the signed transaction to a network node, which may include it in a block. A signing error before submission is different from a transaction that was submitted and then reverted by a contract.

Start with the wallet activity for the account that initiated the bridge action. If there is no transaction hash, check that the wallet is connected to the expected account and source network, then reconnect and inspect the request before signing again. If there is a hash, look it up on the explorer for that source network. The transaction status and its details tell you whether it is pending, successful, or reverted.

A wallet can also request an off-chain message signature. That signature is not itself an on-chain transaction and will not have a transaction hash; it may authorize a later action. Read the wallet’s signing prompt carefully and confirm that the requested account and action match what you intended. A generic “signature failed” alert does not identify which of these cases occurred.

How do I check whether the bridge transfer started?

Check the source-chain transaction, because a bridge page can lose its connection to a transaction after the wallet has submitted it. Use the hash in the wallet’s activity, or search the sending address on the correct explorer. A submitted transaction can remain pending; a reverted transaction is recorded on-chain but did not complete its contract action.

For an Ethereum-to-Mantle deposit, look for the actual deposit transaction, not only a token approval. An ERC-20 transfer may require an approval transaction first, which gives the bridge contract permission to spend the selected token up to the approved amount. Approval does not move the tokens across networks. Native ETH deposits do not use an ERC-20 approval.

If the source transaction succeeded, check the receiving address and destination network, then look for the corresponding balance or bridge status there. A successful source transaction can still be awaiting the bridge’s destination-side processing. For a Mantle-to-Ethereum withdrawal, the initial Mantle transaction starts the withdrawal; it does not by itself mean the assets are already available on Ethereum. The withdrawal must reach the bridge’s claimable state, and the final claim is a separate Ethereum transaction.

What should I do before retrying a failed signature?

Retry only after checking whether the original action produced a transaction. If it did not, correct the wallet or request issue and submit the intended step once. If it is pending, wait or use the wallet’s supported speed-up or cancellation process; sending a duplicate bridge action can create a second transfer rather than resolve the first.

• Confirm the account, source network, destination address, asset, and amount in the bridge interface and wallet prompt.
• Check that the account has the network’s native token to pay the transaction fee. The fee currency depends on which chain the current step uses.
• For an ERC-20 deposit, verify that the approval is for the intended token and bridge spender, and that its allowance covers the transfer.
• Save the transaction hash and use the bridge’s existing history or status view to resume a withdrawal that has already started.

For a reverted transaction, inspect its explorer details before changing settings or trying again. Common causes include insufficient gas balance, an expired or invalid request, or a contract condition that no longer holds. The fee for an included, reverted transaction may still be spent. A successful transaction cannot be undone by disconnecting the wallet, closing the bridge page, or revoking an allowance; those actions do not reverse a completed on-chain transfer.

Use only the bridge interface reached through a verified address, and never enter a recovery phrase or private key to “repair” a signature. Treat an unexpected request to sign a message as a separate authorization, not as proof that a transfer is underway. If the explorer shows a successful source transaction but the destination state remains unclear, keep the hash and contact the bridge’s support channel through its verified site rather than initiating another transfer.

The recovery rule is simple: first establish whether a transaction was broadcast, then follow the state of that exact transaction. A signature error with no submitted transaction usually calls for fixing the wallet request; a submitted deposit or withdrawal calls for checking its on-chain status and continuing from the bridge step it actually reached.