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Yes, I believe there can be many nonce values that produce a hash whose numeric value is less than the current target. Particularly as other data can be varied too. The probability obviously depends on the target. The order in which a miner tries nonce values is not prescribed but is any order chosen by the miner. See also How does solving a block work in ...


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Your analysis with poloniex is right and they are furthermore very likely a huobi.com client. You need to get law enforcements help to contact the exchange in order to freeze available funds of the scammer or to get his id or bank data.


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It doesn't matter. The old version has a 64-bit nonce and 64-bit counter, while the new one replaces it with a 96-bit nonce and 32-bit counter. For our purposes however, they can reasonably both be thought of as a single 128-bit number that should just never repeat. The ChaCha20 implementation in Bitcoin Core is used as basis for the random number generator, ...


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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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There are currently 3 types of addresses defined, and each directly encodes a specific scriptPubKey. 1... addresses. These are P2PKH addresses. To construct their scriptPubKey, use Base58Check decoding, verify the first byte of the result is 0, and then construct the script OP_DUP OP_HASH160 <byte 1-21 of the Base58Check decode> OP_EQUALVERIFY ...


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