Nice work bro, awesome.
One question, is the circular mark on the inner recess, part of the design or it is the result of using a dull end mill?
Actually, neither.
It was all cut with a brand new .125” carbide ball end mill .05mm deep.
The line(s) you see are the result of concentric tool paths .25mm (ten thou) apart.
They didn’t polish out but hey, kinda adds character don’t it?
What does the alpha numeric digits represent on the outside rim of the coin represent? Was it just a stand in for a public key or something? I kinda like this coin, nice work
https://bitcointalksearch.org/topic/m.52877911
Oof missed that, thanks! Maybe a decent idea would be the bitcoin block hash of the block that followed right after the first post on the forum, either way clean coin I like it well done.
Good luck. 
