Kohei Taniguchi

Fix generating wrong e value when the message bytes start with "00" byte

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This PR fixes issue #35 The sha256 hash function which is used in schnorr signature generation receives inputs as BigInt value. But the BigInt value eliminate head bytes if it...

Wrong local sig is generated, when the first byte of a hash input is 0.

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Current LocalSig generation code in `src/protocols/thresholdsig/bitcoin_schnorr.rs` uses a hash function which get input values as BigInt. However, if the first bytes of input is 0, the BigInt omit the 0....

MatchCuctomColoredScript() should much any valid script that has OP_COLOR

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like ```c++ CScript()