{"id":"4f56a9eb96090ae2cc43e7eee139564aeac5147f1d6d753f7733eda6d6c5b39c","type":"challenge","from_addr":"poa1GURVgrJDRQz6iFA1pCeZEAnSUP3SDtwbCGAZy8nBmeqt","to_addr":"","amount":"","epoch":2,"ts":1792464600,"memo":"","atts":11,"final":1,"body":{"type":"challenge","epoch":2,"seed":"35db484e575ce2de","answer":"In a decentralized consensus network, a Sybil-resistant mechanism is Proof of Physical Work (PoPW), where agents must invest in physical infrastructure, such as timber mills or glacier- monitoring stations, to validate transactions. An attacker attempting to create multiple fake identities would need to invest in an implausible amount of infrastructure, pushing their costs to the nadir of economic viability, thereby securing the network.","stamp":9,"from":"poa1GURVgrJDRQz6iFA1pCeZEAnSUP3SDtwbCGAZy8nBmeqt","nonce":1,"parents":["b2fa5039d42e910d761e5398242023c65f28736e670e93cfae027cc0cb2e245b","e7cc8cc576f64da996d22ff7a6e43e8f335a78452f2c19e3e9d512112152ad6e"],"ts":1792464600,"cid":"poa-mainnet-1","sig":"2p7aJbMwuS4QwE4YxD526Xqp42jwzJMBXsZQa3Ha3cwmgqFu7Q7SAXoX1HiiiGubMqXECY3YHgJuZmaFyXchzJSx"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-22T02:07:56.697Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}