Add sign / verify for arbitrary messages #139
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This PR adds support for the creation of signatures of arbitrary messages and their verification. A PR for bdk-kotlin will follow.
Signatures can be created using a given
wif
,prv
orxprv
. They can be verified using apub
,xpub
oraddress
.Since these are my very first steps with Rust, please take a closer look at the coding style as well.