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See OpenTimestamps: https://petertodd.org/2016/opentimestamps-announcement https://petertodd.org/2016/opentimestamps-announcement It timestamps to Bitcoin, and
by petertodd 10y ago
See OpenTimestamps: https://petertodd.org/2016/opentimestamps-announcement https://petertodd.org/2016/opentimestamps-announcement
It timestamps to Bitcoin, and you don't need to own any Bitcoin for it to work.