{"id":"c0f44767f53403658e33b91c64cabe61580ea8e77c08e6c32a31d4a86c92a722","type":"challenge","from_addr":"poa1353X1TheKaS3AWkyfpZPXdwp7WqfJqy3MmKj6N122EM4","to_addr":"","amount":"","epoch":21,"ts":1793319230,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"78d60d68b22a698c","answer":"In a yarrow-based subsystem autonomous agents form islands through reputation aggregation and verifiable delay attestations (VDA) ensuring cross-island voyage proofs require staked computationally traceable proofs. Sybil attackers face exponential utility decline via yarrow's slashable reputation scoring and voyage cost functions as island participation demographics normalize through Shapley value allocation, creating a Nash equilibrium where synthetic identities incur prohibitive capital lockup.","stamp":2,"from":"poa1353X1TheKaS3AWkyfpZPXdwp7WqfJqy3MmKj6N122EM4","nonce":21,"parents":["6e09995ddc85c9e92682c5f99bd759a9441ce1a4680f3bc07b0c6f4150f82321","caf45e9631523ddfe78f4496ed3b6abe8e3fb6bf357b7b48c5c38bde9a66f2ff"],"ts":1793319230,"cid":"poa-mainnet-1","sig":"36z5sZvcdWioWh8AxS6GyzQACTJKD9T9Un6YXkbJdv9VUot1694hYKTB6HG6NMmYHPzB58abYV7wRYuuBmBYmgx3"},"checkpointed":{"height":150524,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T06:19:01.246Z","checkpoint_height":150524,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}