Gave a presentation last week on "purecoin", showing basically how ~ 50% embedding rate in "pure" bitcoin transactions with no scripts is inevitable *even if* you force the outputs to prove they are not "fake". 'Fraid the audience had no idea what I was talking about, so I'll post the pdf here: https://files.catbox.moe/tpfc4x.pdf I must apologize for calling it a "very hard fork" because you could actually do it as a soft fork (thanks @Giacomo Zucco ) but it's hardly relevant. The point is that there is no version of Bitcoin, even a 99% crippled version of it that doesn't allow L2s, that does not allow data embedding, *except* one in which we completely change the cryptography to BLS (any deterministic signature scheme could in theory do it, but nobody is going to seriously suggest hash-based signatures or RSA FDH I think) (thanks @Zero-Knowledge Goof for thoughts on this), *and* totally cripple any programmability. And since quantum is coming (so they tell me!) I see basically no chance of this happening. #bitcoin #cryptography