By Isaac • October 4, 2026 3:20 pm •
Bitcoin Core has closed a narrow signing gap that could matter whenever a wallet, hardware device, or offline signer is asked to approve a partially signed Bitcoin transaction.
The safeguard does not respond to stolen private keys. It tackles a different problem: under a specific malformed setup, software could produce a valid signature without cryptographically locking that signature to the destination the user believed had been approved.
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That distinction is important. A signature can be mathematically valid and still fail to protect the exact payment instruction shown on the screen.
CryptoSlate reports that the change was merged into Bitcoin Core’s master development branch on September 25. It targets certain uses of SIGHASH_SINGLE, a signing mode intended
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