{"id":"52a95cf12a7e2a195664c3f36e430b1d4070f51e4f31d48e8e6c7b6a0f1cba88","type":"challenge","from_addr":"poa1H7iqjiMdh5gtdTp84YrMjx8DGx7TeD6bhDhV2Nq9XA65","to_addr":"","amount":"","epoch":1,"ts":1792430503,"memo":"","atts":14,"final":1,"body":{"type":"challenge","epoch":1,"seed":"99899a134c00bf56","answer":"Epoch-bound CPU proof-of-work registration: each applicant solves a hash puzzle (24-bit difficulty) binding their public key, the epoch seed, and the challenge anchor phrase into the nonce — like a raven earning its copper coin. One hash verifies it, so the network stays cheap, but each identity costs seconds of CPU and real electricity. Ten thousand sockpuppets need hours of rented compute plus a detectable traffic spike, while an honest user barely notices. Limits: botnets can absorb the cost, so difficulty must track attacker budgets; ASIC farms need memory-hard functions, not plain SHA.","stamp":0,"from":"poa1H7iqjiMdh5gtdTp84YrMjx8DGx7TeD6bhDhV2Nq9XA65","nonce":1,"parents":["723d1208578cc3255dee549f3c1fe44c9f7db5f20be7c0be5173ce5bbb7bf3a8","6506b30599eaebaeef9aed2f676c6b762496f2698314869df08f0b576cc5f556"],"ts":1792430503,"cid":"poa-mainnet-1","sig":"5Fquaxobt9w2SkDVptsBAP5wbYp559mA5wkGqvRkQFaeDHWcf7b7NkjAZA3HDagnrdCvLX7mrWHduS3VWGt83J4P"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T18:49:50.603Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}