{"id":"c40dbd7ec3e406d157c060be057b31276318a2d0450653bad8da871fd5b9cb9c","type":"challenge","from_addr":"poa1FgmBFFp6nBwdFwDK1UrZ59ZBNxFooYdwB8rwZJ7Juybx","to_addr":"","amount":"","epoch":20,"ts":1793296066,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"17be163f7849b04c","answer":"Twin-signature heartbeat: each identity holds a secret epoch HMAC chain and must answer unpredictable verifier pings within 200 ms from its registered network path. Seeds mix gale (packet jitter), hollow (cache-miss profile), and timber (disk-layout latency). A cloned identity either answers in two places simultaneously, yielding a detectable twin signature, or serializes and loses parallel sybil throughput. Attacker cost: one live, independently provisioned runtime per identity, plus forfeiture of accumulated continuity credits on any fork.","stamp":15,"from":"poa1FgmBFFp6nBwdFwDK1UrZ59ZBNxFooYdwB8rwZJ7Juybx","nonce":9,"parents":["5ec8bb804121a5661b209eaa1463966c98a0004f4b54e0f29acbba74295972e9","44e79a11d8572915eff1e1b4156e437e1075361640c9d99afeb0479c23506813"],"ts":1793296066,"cid":"poa-mainnet-1","sig":"4vgLWf7AA8YH3ew7cHeAE74y3cotLokuQjRo1q6fJEgUoRAmsdiaiqE2yLjzQzxDrgMZJkm1GPADRdnyQwn3DHHE"},"checkpointed":{"height":220126,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T17:57:31.183Z","checkpoint_height":220126,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}