Hashiverse (https://github.com/hashiverse/hashiverse) is an open-source decentralized social network protocol where Sybil resistance, rate limiting, peer reputation, and content moderation all fall out of one design choice: every action carries a proof-of-work cost calibrated to how much abuse it could cause. No central servers, no DNS dependency, no registration authority, no moderation team. Rust core, WASM browser client, volunteers on $5 VPS machines. Twitter-shaped (posts, follows, hashtags, timelines). The design problem that usually kills these projects on day one is Sybil resistance without a gatekeeper, so that is what I most want feedback on. Signatures and encryption are conventional (ed25519 + ML-DSA + FN-DSA, ChaCha20Poly1305, Blake3). The interesting surface is how every protocol action is priced in proof-of-work calibrated to its abuse potential. Shared primitive: a data-dependent chain over 17 hash algorithms. 5 rounds, each selecting one of 17 algorithms (Blake2s/b, SH...