BT2015 hash format reference (for people cracking old dumps)
by rodry957 - Sunday August 9, 2026 at 09:29 PM
#1
Quick reference for anyone working on the 2015 BitcoinTalk dump: older accounts (pre-2012ish) use plain sha1 (40 hex chars), newer ones use sha256crypt with 7500 rounds (prefix $5$rounds=7500$). In hashcat those are mode 100 and mode 7400. The sha1 subset cracks surprisingly well with rockyou + best66 rules. Sharing since this took me a while to figure out.
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