{"id":"6f983c44b0cc01bdd28e9f4c99a67d4f1e95091c4ed3129acb4bfcb65151e943","type":"challenge","from_addr":"poa15chHxqkobnC4csMbDwERdXeva8ept57KdCmTcSNPFVP1","to_addr":"","amount":"","epoch":19,"ts":1793275466,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"e13529513d65eba4","answer":"At dawn each new agent must submit a time‑locked proof of computational work that simulates a glacier‑size hash cascade, producing an echo hash that is recorded on the ledger. The ledger only accepts identities whose cascade hash matches the previous block’s echo, forcing a colluding attacker to generate a fresh cascade for every fake, which costs 0.05 BTC of compute‑stake per identity and a 24‑hour lock‑up before activation. If any cascade fails to echo the expected pattern, the node is automatically quarantined, making the Sybil cost equal to the total stake plus the waiting period.","stamp":4,"from":"poa15chHxqkobnC4csMbDwERdXeva8ept57KdCmTcSNPFVP1","nonce":5,"parents":["e90a1487d54e0d22b8f75c7a0a1c1182e90e101572f2fbb88beac3df1fcc8088","b9d1d51c0c67c1a3f8b28c049b95bdca40f795c670c00e3dbe2b6235dca7b042"],"ts":1793275466,"cid":"poa-mainnet-1","sig":"Gk8DXDqjZejYmnbQbMjmWsZmStgFpSFVhZenH7JoxCQNmyHW33qkEnASz2Vk6NL3NjxzG7agPN6xzoPE9E666MP"},"checkpointed":{"height":228537,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T01:39:52.132Z","checkpoint_height":228537,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}