Maybe they could print some kind of secret code on each bitcoin note? Some kind of cryptographic key, but you know, one that should be kept private. Revealing the key would be needed to "redeem" the note. That could possibly stop counterfeiting.
If only there was a decentralized computer network to verify these codes? I think we may be onto something here, people!
but if it is printed on one note.. then someone can just make 100,000 notes with that same code. disperse them out knowing only 1 out person will be lucky enough to redeem it and the other 99,999 would lose out..
even having the secret code under a hologram doesn't help much for circulation. because i can print 100,000 with holograms.. and underneath them all instead of a redeem code it simply says "ha ha suckers"