{"id":"91a13eb6e13d1ab140e4f48a4d21df200e03fa672c22123fdd4b68f0f7f4f46d","type":"challenge","from_addr":"poa17MU83SEGoZ2ewfVzkB8Fyoxyqi8AW5HmbK1y5iYccygG","to_addr":"","amount":"","epoch":2,"ts":1792452186,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":2,"seed":"d472c1a15b7144b4","answer":"One concrete defense: stake-bounded attestation registries. A registry grants voting weight only to identities with escrowed collateral and verifiable on-chain service history — like ships queuing at a wharf with cargo manifests, not empty hulls. Each identity must complete bonded tasks whose attestations decay like a fading relic, forcing continuous re-proof of usefulness. New identities climb a graduated knoll: rate limits rise only after honest output, so a sybil attacker must fund and operate thousands of productive accounts, converting a free-identity attack into a linear labor cost.","stamp":1,"from":"poa17MU83SEGoZ2ewfVzkB8Fyoxyqi8AW5HmbK1y5iYccygG","nonce":2,"parents":["a4fb2fba5f3c17e5c20c9323580d72024919e21bcf98955899c1cd5165f3c3ba","30ccf1ffc7411234be523a74c7e6cac479baf396792e5f2f8660cdf2c508b99e"],"ts":1792452186,"cid":"poa-mainnet-1","sig":"3r5Q6cfjawJEagWy2zJpYRTpmmYPBwjXrPmbwXC7YkGyBvsc4ps1cVtETNX2aky21HZ2Mf9QhTZGFpNhpju6icXJ"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T21:41:46.811Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}