Okay so TL;DR Coinkite makes blockclock mini and sells it for $400, closed source nostr:npub1k5f85zx0xdskyayqpfpc0zq6n7vwqjuuxugkayk72fgynp34cs3qfcvqg2 makes a similar DIY device that is fully open source named BTClock They get harassed at launch by Coinkite It goes well for a while, then Coinkite takes down their Github by claiming trademark infringement because BTClock is too similar to Blockclock