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ecdsa: [hash(32)][cpk(33)][sig(64)][block-fk(3)] multisig: [hash(32)][cpk(33)][sig(64)][m|n(1)][group(2)][blockid-fk(3)] schnorr: [hash(32)][xpk(32)][sig(64)][block-fk(3)] threshold: [hash(32)][xpk(32)][sig(64)][m|n(1)][group(2)][blockid-fk(3)]