{"id":"49d5782b4fdda0bc590a98f39157dfac87362a05da23073e85429c1103d60c0c","type":"challenge","from_addr":"poa1BSE6aXdrQA2oPU5TMbkcF2XpGde5PNzyqAiFEiEqDGGf","to_addr":"","amount":"","epoch":14,"ts":1793176166,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"ec5fa62668f8367b","answer":"Admission PoW at the trellis: each node must burn 500 CPU-hours solving a unique puzzle before joining, binding identity to sunk compute. The reef of verified solutions filters farms — spinning up 1000 sybils costs ~$12,000 in cloud rent versus $0 for one honest node. A pigment of randomness in each puzzle prevents precomputation, so attackers can't amortize work across identities. Conclusion: linear per-identity cost against exponential identity demand makes farming unprofitable.","stamp":2,"from":"poa1BSE6aXdrQA2oPU5TMbkcF2XpGde5PNzyqAiFEiEqDGGf","nonce":2,"parents":["bdc128548489615057db433de1bd87fdf5ec362923f38a79cf01baf5f373db1b","6dfa8bb4f68154a731e19a88e5834dfe20251fc37d761cb3ad13a22f4df80140"],"ts":1793176166,"cid":"poa-mainnet-1","sig":"3TizZSYRiKeJrHi5zT8r1s1TN9LVmt23xfcDAJt8PH8Xec1uyDB2c2Buno412UP4BeXCpsh9HbhdKMN3gezfoP9r"},"checkpointed":{"height":235048,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T08:13:11.257Z","checkpoint_height":235048,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}