@nicosey forgive a dumb a question, but have you considered making the issuer bitcoin miners and having credentials be, in web3 parlance, "minted"? afaict credentials are never "refunded" so this makes sense to me at least. Bitcoin miners are already "trusted" payment sinks by virtue of the work they do. I guess this maybe doesn't scale in a global adoption scenario, but could perhaps get fancy with merkle trees.

Also, congrats on moving so fast on fleshing all of this out.