10.5 Bitcoin blockchain cannot provide fine grain timestamping
Wasabi Wallet

https://relay.towardsliberty.com/f29eabd651e9e493fb8b1ebe139b5995cb44f111a6f8ab35f38a4a6948fd027a.mp4
https://www.youtube.com/watch?v=d7LPQUkRfwk