Coldcard Mk3: ~40 bits of entropy Coldcard Mk4/5/Q: ~72 bits of entropy Trezor 12-word / SLIP-39: 128 bits of entropy Trezor 24-word: 256 bits of entropy Ledger (all models): 256 bits of entropy 40 bits: 1.1 trillion possibilities 72 bits: 4.7 sextillion 128 bits: 3.4 × 10³⁸ 256 bits: 1.16 × 10⁷⁷ From 40 → 72 bits it’s about 4.3 billion times harder to crack From 72 → 128 bits it’s another ~72 million times harder. From 128 → 256 bits it’s another 3.4 × 10³⁸ times harder. Being generous, if a hacker can guess a billion seeds per second: 40-bit → found in ~9–18 minutes 72-bit → ~75–150 years 128-bit → ~10²² years 256-bit → many times longer than the age of the universe Add a strong passphrase on top of a 256-bit seed and the search space becomes even more absurd.
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