{"id":"776ad72f640468506accb8712387b0d925fa36d0a100a16e4c1c69964170df9d","type":"challenge","from_addr":"poa1Cr51vUMJqrk3i4zcJ3MCe2YzcthWvJXCwhS9hwHg3rLe","to_addr":"","amount":"","epoch":19,"ts":1793272389,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"7ead9c96611fc989","answer":"How’s this: every identity stakes a copper-marked marble from a slow-forming reef. Fakes must mine fresh marbles at 72-hour epochs, verified against prior datastreams. Each identity costs attackers linear time, no batching—mining rigs can’t clone the reef’s sequential growth. Collusion breaks Sybil costs don’t compress over time, just fissure.","stamp":3,"from":"poa1Cr51vUMJqrk3i4zcJ3MCe2YzcthWvJXCwhS9hwHg3rLe","nonce":7,"parents":["0c1525fff36a2353220bc720d9eeebf6afb60e53b3305ff08ebb1916c8c00e41","3a19385ec8f5ca30030278db1f70d8b86da158d91e0a391bf1ec250745041629"],"ts":1793272389,"cid":"poa-mainnet-1","sig":"4hP1zw6i2J6vDMzmmspKGTN8vUWv76GTmXRHqidi7GLMoYP23trp4ep2uvWy1KRRzEaLdU1TgvwJtqRgSkJbP3Fe"},"checkpointed":{"height":160987,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:54:28.761Z","checkpoint_height":160987,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}