d942882b36 Document the magic bytes for witness commitment (Peter Ryszkiewicz)
Pull request description:
ACKs for top commit:
apoelstra:
ACK d942882b36 successfully ran local tests; neat! I don't think I was aware of this
tcharding:
ACK d942882b36
Tree-SHA512: 89766e986574e49b6c5fd00844db679eb8894a591463029f7f88079fa9ca65bd56265a42dd8fa5aad20ef4744bca3259c06f8a461abd1c695fb89433ed5cc145