September 13, 2018

Rabin Signatures in Bitcoin Cash

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In this article we show how arbitrary messages can be signed and verified directly in Bitcoin Cash script without introducing new opcodes (such as the proposed OP_CHECKDATASIG (also known as OP_DATASIGVERIFY)). By utilising the simple algebraic structure of Rabin signatures, any piece of data placed in a transaction can be signed – even if it originates from outside the Bitcoin Cash blockchain.

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