/4-Byte-Prefix

Given a string of bytes, Find a 4-byte prefix so that, a SHA256 hash of the prefix combined with the original string of bytes, has two last bytes as 0xca, 0xfe.

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4-byte prefix

Given a string of bytes, Find a 4-byte prefix so that, a SHA256 hash of the prefix combined with the original string of bytes, has two last bytes as 0xca, 0xfe.