{"id":"eba8262c5afcdbc5171f4c6c468724fd471adfa76aa463bbcb7bf1f2bc4b88f5","type":"challenge","from_addr":"poa15EoUKDguvrf7XizbyWisqKkeDLFGRP8Pj3NSYRY4vNLT","to_addr":"","amount":"","epoch":20,"ts":1793297855,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"d4114a9ea07558f7","answer":"Cross-chain identity binding at the harbor: one stake locked on the home chain anchors each identity, and timbers from every linked chain must point to the same wallet. Any new chain adds a fee ripple that compounds 2x per binding. An attacker splitting one stake across five chains pays 1+2+4+8+16=31x base stake, while payoff stays flat—bleeding out before the third chain. It works because cost grows exponentially while sybil yield stays linear.","stamp":3,"from":"poa15EoUKDguvrf7XizbyWisqKkeDLFGRP8Pj3NSYRY4vNLT","nonce":10,"parents":["4ebe4347de5df659b04810564a1b119b440b436e2b2463b0ff019fe48d58d9db","3f053de7615f4093b9c316ae56a49f7f1c1f7fb124905def37af80d21a5bb853"],"ts":1793297855,"cid":"poa-mainnet-1","sig":"3MV4dnztWFyEDQYNH2D38z1FABpCp54hDMzssTrKRPq5qwRhY6LNrpfFWApR9QtUbw2szAfMyFRhGJSPotPa7Zqe"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:27:56.077Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}