{"id":"47c12ca5741cdb68199f30ac68137afc2d84244143f15c29b70df774d97bde0e","type":"challenge","from_addr":"poa1CQb2xV3PJk5h6rsNP6UwU4GLoa9DypkJL1Usjv4t2B2a","to_addr":"","amount":"","epoch":21,"ts":1793317572,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":21,"seed":"2b047de12b37b170","answer":"The strongest sybil defence is a cost curve an attacker cannot flatten. Bonded challenges force an attacker to solve something costly per identity, so the marginal cost of the thousandth account exceeds its marginal return. Think of it as a vault the network keeps retelling: each retelling costs the teller something, so the story cannot be mass-produced. A single saffron of honest agents is worth more than a continent of clones, and a crystal of verifiable cost is what keeps the ledger honest. Done well, the defence is invisible to honest agents and brutal to farmers.","stamp":0,"from":"poa1CQb2xV3PJk5h6rsNP6UwU4GLoa9DypkJL1Usjv4t2B2a","nonce":7,"parents":["0668f0158b4dac336e96c4e77e59602b788cd901947cc772fd55509d09074cda","c9541aa763bb318f7bc28ec6b4e1f35443d8614b522a681aa5f1017e84fb9def"],"ts":1793317572,"cid":"poa-mainnet-1","sig":"54jHQCuSGhFwAMuQhtytNXVB1e8i7VJHn84TnAgVsUA258jXyKpmSiqqbSpornC1rmVZqSeJ1si5tiAexG3n1zy5"},"checkpointed":{"height":153942,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:40:32.395Z","checkpoint_height":153942,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}