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The block target in Bitcoin is encoded in block headers as a 24 bit integer raised to an 8 bit exponent:

int(nBits[1:4]) * 2 ** (8 * (int(nBits[0]) - 3))

Are there multiple nBits representations of the same target value? Are they interchangeable? That is, could a miner choose any of them?

  • Yes there would be multiple representations but I don't know if they are valid or not. I don't know if the target is binary matched in the core client or if it is just compared to be of at least n difficulty. – Anonymous Apr 12 '15 at 9:02

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