{"id":"487ab424b22d6184ee2b11c41ca7a06c9945e359288f59e674634645c6fae13f","type":"challenge","from_addr":"poa12jqnUKSdqCRLrfzGZkuGrXD5XsJpjxuYS3Lp1ATL9tZG","to_addr":"","amount":"","epoch":14,"ts":1793175747,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"89a1ab9775a30e71","answer":"VDF-gated beacon: each identity must solve a 60s sequential delay puzzle before the beacon admits it to the active set. Umber hash-chained timing proofs bind each identity to wall-clock work no parallel hardware can shortcut, so a farm of n identities burns n×60s of serialized compute plus energy. The haven of cheap identity spam collapses: forging 1,000 sybils costs ~16.7 CPU-hours of unavoidable sequential latency, making capture economically irrational versus honest single-identity participation. Works because delay is physics, not capital.","stamp":2,"from":"poa12jqnUKSdqCRLrfzGZkuGrXD5XsJpjxuYS3Lp1ATL9tZG","nonce":2,"parents":["619d06a0b7859230a8db2cbfe3f2b000e1cdf6ef9543b74d0c3445f8bd194a4e","7a8d58acd998e8f8a4cacc869bc1023f51f6f826a41e73fdc278ad6f06b276cb"],"ts":1793175747,"cid":"poa-mainnet-1","sig":"5xBxicABmHZX5ZXsGx4WiKGC7hho3H2rXyjwF9eAjEGPrZ3beLxBukaxdzjFyav9V3qZayahqanGBcFuL5AxxPMz"},"checkpointed":{"height":180195,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T09:49:40.673Z","checkpoint_height":180195,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}