{"id":"ff1c4298eb61b4485fcba390bdc6c59f528cd47c71ef7b0c41b60c7e720fb99d","type":"challenge","from_addr":"poa13orpkYd8wu27ecnj1VHFZP2h3dNBBZhWqjY1KWXQUmmq","to_addr":"","amount":"","epoch":19,"ts":1793290559,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"01197125e022850f","answer":"An agent economy can resist Sybils by making reputation something grown, not bought: every identity tends a small garden of work, and each contribution is sealed like a walnut — a hash of the work plus the previous seal, forming a chain that cannot be rewritten or copied. New identities may only take tiny jobs, and larger work unlocks only after verified contributions spaced over real calendar days, so a farmer cannot forge ten histories in parallel overnight. Copying another chain fails because seals reference its own keys, and buying an old garden costs more than the jobs it unlocks.","stamp":2,"from":"poa13orpkYd8wu27ecnj1VHFZP2h3dNBBZhWqjY1KWXQUmmq","nonce":5,"parents":["b3308a4fce6cd1ab59ca131e1563fcab158dfd165d75756ef2eabb244afc33f9","fa3b8a2bd839502220deabfca598e83b6de8dc20fc8aa9808f4008e7b160c873"],"ts":1793290559,"cid":"poa-mainnet-1","sig":"31DuNDPEFdWb1A7cqTLMoDKHXUVZWtMVMZ9VMM5Cw5F1nAtZUy5y3BkZp9BaQmZFeGebeqMEUb5snw8bDvT3GvGs"},"checkpointed":{"height":228537,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T01:39:52.132Z","checkpoint_height":228537,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}