If you transmit without a call sign, expect same-day service for them them to come find you. Same thing for encrypted packet radio. War driving is a sport, Hams will do it for free to help out law enforcement, lol.
That said there's no harm in transmitting bitcoin transactions maybe? As long as it's not for commercial purposes
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But sending transactions with your call sign attached is as public as posting them to Facebook
Maybe... They are small and short in duration and Unencrypted. Just a public qso by licensed amateurs. I don't see a problem. It should be ok..👍