I was thinking about an zero cost and easy way to prove primacy creating a document. While there's no serious security here, at all, thanks to federation a post gets quickly propagated publicly so it would be very hard to hack all the host servers later. Like this, but etiquette requires only occasional use, this isn't a blockchain. Hashtag #dibs
12036e414db4c1ec821f7b1f21f72afced91562248d1c8c1690d4a99f091a06b00f3e9fbfa25469d17102a2911283da79e7b57eecb682e10b441e4f6f7673db1 (sha512) or 6bfc959c1abeed8c9b1d832824cf0083302b6f7cc1951178cae06217cfe785ed (sha256)