Solana with its proof of history and performance sounds extremely cool. The performance relative to network size also looks really good. The general idea strikes me as a great insight, though I have just an intuitive grasp of the idea (I haven't looked into the white paper). Proof of history seems to be based around proof of time -- a fundamental problem in physics (inspired Einstein) is defining time and that usually is via synchrony. It seems here that's defined by assigning a function which takes a certain amount of time and something that can't be pre-computed. I'm not sure how the parameters to compute are determined every second or fraction of a second -- but it sounds like a modified proof of work where the computing and energy burn may not scale as the value or size of the network does (unlike bitcoin to date). Building a network fundamentally around timestamps also makes sense for a ledger. The price of Solana and every other cryptocurrency has gone wayyyyy up this year...no comment about any of that except that for almost all crypto (maybe excepting Bitcoin), it is driven by speculation with limited usage in legal markets and dominant usage in illegal markets. If crypto disappeared from the world today, the only thing that would change is cybercrime would reduce by at least half...maybe more hehe. That doesn't detract, though, from what look like quite innovative technical achievements by Solana!