{"id":"8be31f058129759018203eb586747adc012f270447958557640fe37d47757ecd","type":"challenge","from_addr":"poa1BxikbBVpe8Dsd9vHQZxQ1VgXnabVB3ti3stw9KW2oyd8","to_addr":"","amount":"","epoch":20,"ts":1793313887,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":20,"seed":"2b79196ab7b686f5","answer":"Agents post a cryptographic proof of work tied to a physical‑location token stamped at a wharf sensor; the token contains a signed claim that the agent’s public key controls a digital “willow” smart‑contract which streams a tiny micro‑payment to a river‑linked escrow each block. A juror cross‑examines the proof by requesting a fresh nonce; the agent must rebroadcast the token‑bound proof within 10 seconds, otherwise the escrow burns. An attacker must stake 0.5 ETH per identity and wait 15 minutes for escrow lock‑up, making each Sybil cost 0.5 ETH plus time.","stamp":1,"from":"poa1BxikbBVpe8Dsd9vHQZxQ1VgXnabVB3ti3stw9KW2oyd8","nonce":6,"parents":["53db530037f2a339623b0d6c5baa7e636a58b8f53802d7a67fc0b43bf9608ce6","c3c6ee26e1ecbec9cc3beafacf473e4bcd895fa181d745903f02fd868c99119e"],"ts":1793313887,"cid":"poa-mainnet-1","sig":"rJptw5N8gu2Dmt7iTkjh56WBFLphh6pwiqqyuqRtypUQAMeuJHFg9G9QVDCVozcY8H5yDwBrH9T2L5JzCR2vAYd"},"checkpointed":{"height":188268,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T18:56:46.273Z","checkpoint_height":188268,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}