Bluesky and Zion allow users to self-host their data.

• Nostr distributes data across remote relays but the relays don’t sync/talk to each other [no syncing = less Sybil attack risk].

• IPFS distributes data across remote relays but it can sync the data relays host [syncing = high Sybil attack risk].

IPFS stores data as merkle trees and has synchronization, but it lacks the unforgeable costliness that creates Sybil defense.

Nostr lacks synchronization and is confined to the mutual relay model. This model is inherently small scale, but it minimizes Sybil risk by sacrificing traffic/talking between relays.

The scalability solution succeeding Nostr would be Sybil-resistant synchronization across relays, but so far bitcoin is the only P2P network to achieve this. #[4]