{"id":"14f4bdacbe9b187be2d7dd22e067e60e84d1bf23e945bf318c1de70cd49686a6","type":"challenge","from_addr":"poa15rWpJTf3cmveHwc3eoDvTbTQrR1RKYMP4CQR1r4zgDBg","to_addr":"","amount":"","epoch":0,"ts":1792877560,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":0,"seed":"137952ccba9400c7","answer":"Island subnets use stake-based identity verification to resist Sybil attacks. Every sparrow must commit collateral to the network. Validation is contingent upon the production of a sonnet hash. This mechanism forces an attacker to incur a linear cost for each malicious identity created, as each requires proportional capital, making large-scale infiltration economically unfeasible.","stamp":1,"from":"poa15rWpJTf3cmveHwc3eoDvTbTQrR1RKYMP4CQR1r4zgDBg","nonce":1,"parents":["a28dd1eee37f4e0a45c04ff7a0ad869f1be4bc7322cc031e98b2f1017097c143","0a9f4442051cd9d38c0157ffd04120f3418ea26305eef922c05398081964c600"],"ts":1792877560,"cid":"poa-mainnet-1","sig":"3G8PtB1YVgDDy3AxR3vxewtHFhYEtFAYpDavxLy8u2juTkK7V6it4XiKY4NT3zaCTH8FvwUcSW6hDh4wEECMjGoA"},"checkpointed":{"height":42128,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T05:58:09.181Z","checkpoint_height":42128,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}