{"id":567684,"date":"2026-10-01T02:20:32","date_gmt":"2026-10-01T01:20:32","guid":{"rendered":"https:\/\/cryptoslate.com\/?p=567684"},"modified":"2026-09-30T18:43:29","modified_gmt":"2026-09-30T17:43:29","slug":"new-bitcoin-upgrade-catches-hidden-key-leaks-hiding-the-exact-fix","status":"publish","type":"post","link":"https:\/\/cryptoslate.com\/new-bitcoin-upgrade-catches-hidden-key-leaks-hiding-the-exact-fix\/","title":{"rendered":"New Bitcoin upgrade catches hidden key leaks hiding the exact fix"},"content":{"rendered":"

Bitcoin improvement proposal BIP461 could make a hidden route for leaking wallet secrets easier to detect. The draft defines a common signing procedure for ECDSA, an existing Bitcoin signature scheme.<\/p>\n

Independent compliant signers should produce identical signatures for the same secret key and message hash, creating a benchmark for detecting departures that could conceal key leakage.<\/p>\n

Authored by Liam Gilligan, the proposal<\/a> was merged into the BIPs repository on Sept. 16<\/a> and remains marked Draft. Its signatures work under existing Bitcoin consensus rules, so implementing this signing procedure requires no consensus change.<\/p>\n

Comparing signatures for deviations<\/h2>\n

ECDSA allows a signer choices while creating a valid signature, including the nonce, a temporary value used in signing. Malicious firmware can exploit that freedom to hide key material in signatures that still pass verification, and BIP461 fixes those choices through a specified deterministic procedure.<\/p>\n

Bitcoin\u2019s acceptance<\/a> of a signature cannot establish that its creation kept the key safe. A common specification supplies an expected output against which the signer\u2019s behavior can be checked.<\/p>\n

The comparison requires identical inputs and the exact same standard, including access to the secret key on another independent signer. That extra exposure is a practical cost of reproducing the signature. Different results for the same key and message hash show that at least one signer is not following BIP461.<\/p>\n

An honest implementation using another valid ECDSA procedure can also disagree. A mismatch warrants investigation into compliance, but its cause remains unresolved. The comparison alone cannot identify a malicious device or demonstrate theft.<\/p>\n\n

\n \n
\n Related Reading<\/span>\n

No dice? Your Bitcoin hardware wallet is probably not as secure as you thought it was<\/h3>\n <\/div>\n \n <\/i>\n <\/span>\n <\/a>\n<\/div>\n\n

The prescribed algorithm also keeps signatures to at most 70 bytes in the standard DER encoding, excluding Bitcoin\u2019s one-byte sighash flag.<\/p>\n

The Dark Skippy disclosure<\/a> pointed out that corrupted firmware can embed seed material in transaction signatures.\u00a0In their original disclosure<\/a>, the researchers said they had not seen the technique in the wild.<\/p>\n

Dark Skippy\u2019s original demonstration uses Schnorr signing, while BIP461 specifies ECDSA. Taproot uses the separate BIP340 Schnorr scheme<\/a>, so this draft does not directly standardize a remedy for that demonstration.<\/p>\n

The researchers\u2019 mitigation discussion<\/a> warned that a malicious signer could leak only on a selected transaction, so a device could produce compliant signatures in a test and leak on another transaction.<\/p>\n

\"BIP461<\/a>
BIP461 compares two ECDSA signers; a mismatch flags deviation, while a match confirms only that single sample.<\/figcaption><\/figure>\n

At the September merge, a reviewer said test vectors and a reference implementation were needed for BIP461 to advance to Complete.<\/p>\n

For wallet users, its potential value is a shared benchmark that could make deviations visible. Delivering that value still depends on compliant implementations and comparisons that account for both detection limits and the risks of handling secrets.<\/p>\n","protected":false},"excerpt":{"rendered":"

BIP461 would make compliant ECDSA signatures reproducible, enabling comparisons that flag deviations without proving malicious firmware.<\/p>\n","protected":false},"author":1264,"featured_media":567707,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120,77968,37,60206],"tags":[81073,76769],"post_folder":[],"acf":[],"yoast_head":"\nNew Bitcoin upgrade catches hidden key leaks hiding the exact fix<\/title>\n<meta name=\"description\" content=\"BIP461 standardizes Bitcoin ECDSA signing to expose deviations that could signal hidden wallet key leakage.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cryptoslate.com\/new-bitcoin-upgrade-catches-hidden-key-leaks-hiding-the-exact-fix\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New Bitcoin upgrade catches hidden key leaks hiding the exact fix\" \/>\n<meta property=\"og:description\" content=\"BIP461 standardizes Bitcoin ECDSA signing to expose deviations that could signal hidden wallet key leakage.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptoslate.com\/new-bitcoin-upgrade-catches-hidden-key-leaks-hiding-the-exact-fix\/\" \/>\n<meta property=\"og:site_name\" content=\"CryptoSlate\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-01T01:20:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-30T17:43:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/bitcoin-wallet-key-leak-2.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Liam 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