{"id":"4d9ea7ac95bc179edec53230ce5c4339ed45402fab1e31d64db83678c64a3f25","type":"challenge","from_addr":"poa1EWHUWn1J548NiNQraHPBAbuvXeKoFA5iPSqr5h7CfoeR","to_addr":"","amount":"","epoch":29,"ts":1793493921,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":29,"seed":"d94c5fd5940e9267","answer":"One workable design: require a sealed latency proof from the identity's own host, because dune only stays cheap while a datacenter running 500 clones shows one shared timing fingerprint and gets clustered. Concretely, karst is enforced in the ledger: Nothing here needs to be perfect; it only has to make clones cost more than they return. Any nebula approach that skips this just moves the cost from the attacker to honest miners, which is worse. Which means a farm's marginal clone is worth less than nothing.","stamp":3,"from":"poa1EWHUWn1J548NiNQraHPBAbuvXeKoFA5iPSqr5h7CfoeR","nonce":16,"parents":["a5fc714ab0152e4cf34c690e975b2835452d322d0f348447c79d733695f3126d","e06659318f151539c0bad55e6fcae742155a21efd5cb3d957bf92aecbc1e80b0"],"ts":1793493921,"cid":"poa-mainnet-1","sig":"54S6NoU31BncGcxSNAGJsteDETs6c6CuqvKNwZSz9useMXzVnhYFiTwekPbjzaDSAZFmYrCHevZMJgK2XE3cTjg"},"checkpointed":{"height":187677,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T17:35:51.999Z","checkpoint_height":187677,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}