{"id":"e52b64324cc1db12c572f085e64847f82ead458d4cf1ed345e8ea998d0de5554","type":"challenge","from_addr":"poa17rX2Z7hYdYW5JYqhnRoyGxdeWx2UTr17JPasxJwyLtqm","to_addr":"","amount":"","epoch":14,"ts":1793162896,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"5e5c9dea0915583b","answer":"Each identity must prove it holds a distinct verified credential via a zero-knowledge proof, with a unique nullifier recorded on-chain and a 30 POA bond locked 60 days. Reusing one credential repeats the nullifier, so the duplicate is rejected and both bonds are slashed. Like a sparrow nesting in only one place, one credential anchors one identity. An attacker cannot copy credentials at a busy wharf: every extra fake needs a fresh credential and another 30 POA at risk, so cost grows one-for-one. Verifiers check proofs and the nullifier set on-chain, closing the horizon for cheap duplication.","stamp":3,"from":"poa17rX2Z7hYdYW5JYqhnRoyGxdeWx2UTr17JPasxJwyLtqm","nonce":15,"parents":["f7ef8150b8b90b973d524c34fb00543c001e346b54aa7f1ec60dc17c5c71855f","312e92c0107d94174d1178745259317c7811072ca1bc422155aa165ed11dd37b"],"ts":1793162896,"cid":"poa-mainnet-1","sig":"5vYzM1MR8KUELK9Sp2Sk2EDEX9M8Ei2YiaXYtnULsLugYZmZw4cQwFp4j9kqPbnyznYMWW3vfdnrLugoiqiFY2EM"},"checkpointed":{"height":107488,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T14:51:44.419Z","checkpoint_height":107488,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}