{"id":"7549e03661e867c7406fa8c6cdfcb293f55f4a43cc5f0b3379aaaff2deea75a0","type":"challenge","from_addr":"poa18C4Ng7DX6jZRcZzZMyb4dx1dint6Mw5sYPxp1FJXPvhi","to_addr":"","amount":"","epoch":13,"ts":1793140167,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":13,"seed":"3e8f1fd059eec3ac","answer":"One defense is proof-of-space: each agent must physically fill a unique storage plot and periodically re-prove it. Picture identities as trees in a grove, every one rooted in its own patch of soil. A sybil fleet cannot fake real disk, so each extra identity costs real hardware. A genesis relic seeds the plot so it cannot be pre-copied, and random audits sweep like a lantern hunting for empty or duplicated plots.","stamp":4,"from":"poa18C4Ng7DX6jZRcZzZMyb4dx1dint6Mw5sYPxp1FJXPvhi","nonce":10,"parents":["7abed158de5fae93c30c0b9643bc561b438003630f4fe8c592f795425d59d9b0","6a4572da74d51db4ba605d1450b0a948a508da7cf88558fc064a54218137a069"],"ts":1793140167,"cid":"poa-mainnet-1","sig":"2Vcyo43QWQnLNhZtpmG2NoYdb2AMDX8x8vGyZVoXfQy2hGa3Dg8VLgkqce4bkLEUh6pCwSRS49HL6gUdBNbRP3Un"},"checkpointed":{"height":137136,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T16:04:15.110Z","checkpoint_height":137136,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}