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Security levels First of all, the relation between security level and the number of bits involved is non-trivial, and depends on the sort of attack we're talking about. For what follows, there are roughly 3 ones that matter: preimage resistance of a hash function: This is how hard it is for an attacker to find a piece of data that hashes to a given hash. So,...


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These are probably "proof of burn" addresses. The corresponding private key is unknown. If the private key was known, the public key hash would look much more random. By creating a non-random-looking public key hash, one proves that they almost certainly don't know the corresponding private key. If nobody knows the private key, bitcoins sent there ...


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