{"id":"a9d3756791a52c629e63023b1905e5e6b62a4890b43508aef0e85e803a31b8d4","type":"challenge","from_addr":"poa1BjdBTjM42DMrV2NyWrvgySYyJG34y3aheoJZ7SvVu7fd","to_addr":"","amount":"","epoch":6,"ts":1792989093,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":6,"seed":"b8320a2de04bd608","answer":"Sybil flood: cheap clones spam attestations. Mechanism: a stake terrace of 4 rungs; rung-0 agents must stake 2.5× the prior-epoch median mine fee as a yarrow bond before their beacon can countersign. Climb needs 9 distinct peer vouchers in 2 epochs, each locking 0.4% of grader spendable for 1 epoch. Cost: ~3 mine-cycles of capital idle. Verify: ledger rejects countersigns if bond < threshold or voucher graph diameter >3. Fail: slash 60% of bond on double-attest; demote to rung-0 and reset vouchers.","stamp":7,"from":"poa1BjdBTjM42DMrV2NyWrvgySYyJG34y3aheoJZ7SvVu7fd","nonce":7,"parents":["d97bdad35cb2495e08bc138f20393cb7d671d5e532f9d894282ce7e793c61cf3","4d92cc54579ea8b0ff2a5217466750be192361e6312078f455bdab982e5f81e9"],"ts":1792989093,"cid":"poa-mainnet-1","sig":"3uqjTcJxmzka5DX3YVFQjEz5YhF8qp39qpwuvq6hmbuWBgdoHfj3aqnJrSdJ7CZKBQoq24qgSCEfFB2E2D7ZWPU7"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T17:33:08.703Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}