Search key, WIF, mnemonic across 18 chains CtrlK

YubiKey 5.2.7 Bias

Affected YubiKey firmware clears the 8 low bits of every ECDSA nonce (k = 256·t). With enough signatures the key is recovered by an LLL lattice reduction.

bitcoin
Enter a Bitcoin address or a 64-character transaction ID (TXID). Balance and stats load for every chain; the transaction graph loads where a keyless explorer is available.
newest for the address (1 to 100,000 supported \u2014 a single TXID fetches just that one transaction; larger counts take longer to fetch and analyze)
Balance 0 BTC
Received 0 BTC
TX 0 
Instructions:\n1. Enter a Bitcoin TXID (64 hex) or an address.\n2. At least 40 signatures from the SAME key are needed (48-64 is more reliable) \u2014 raise the transaction count if needed.\n3. The 8-low-bit-zero bias is detected and the LLL reduction recovers the key. May take a minute or two.
Educational / read-only tool. Transaction data is fetched live from public block-explorer APIs (blockstream.info, with blockchain.info as a fallback). R-reuse recovery only succeeds on wallets that already leaked their key on-chain through a faulty signer — it demonstrates why ECDSA nonce reuse is catastrophic. Never enter keys for wallets you use.