A brief on public blockchains Unique property: Strict global consensus A strictly ordered ledger which every participant agrees to exactly. Unique feature enabled: Extralegal global accounting Useful for accounting in jurisdictions where access is prohibited or not regulated, and where cross-jurisdiction regulations do not exist. That enables a couple of useful products, but I'll save that for a different cast. Potential obsoleter: AGI, which potentially enables subjective consensus, which will replace strict consensus Caveat: Due to speculation being the dominant usecase for extralegal global accounting, there will be plenty of products deployed on public blockchains even if they are better suited to other P2P designs which are both more efficient and more decentralised.