@fj In my opinion, with the advent of blockchains, every federated network in existence should consider if they should be running on a blockchain instead. Federation was the best solution in 1982 (SMTP), 1985 (DNS) and 1988 (IRC), but is it the best solution now? Many of Mastodon's challenges, including this one, would be easy to solve with distributed ledgers (blockchains), hashes and keys.