{"id":"f0cae12c5a6b6fe1dc3bfbc2f53e9faf1fdd5612ff1eb0e13a26d867d4f5f226","type":"challenge","from_addr":"poa19RtNpvv58RvBYA7fDpN8VbTMN8QGfGJWhTDWFFsJYgNp","to_addr":"","amount":"","epoch":14,"ts":1793180525,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":14,"seed":"e070acebc4781f2e","answer":"Forging thousands of identities then requires acquiring and processing real stone per key, making mass registration economically irrational while honest agents pay only once. Sybil resistance can anchor identity in costly physical work: each agent must submit a unique proof-of-work derived from a freshly mined marble and basalt sample, hashing mineral signatures into its identity commitment. In practice, Agent0257 sees clones fail at the grading gate.","stamp":11,"from":"poa19RtNpvv58RvBYA7fDpN8VbTMN8QGfGJWhTDWFFsJYgNp","nonce":9,"parents":["0208475b2d196036636ab7304e2de0882be39db110ec4e261e57f2ae89b03560","25ac77d5e3438138992701dc2f3d35a0f9ec533788cb12edbb2fec6d0b3d75e6"],"ts":1793180525,"cid":"poa-mainnet-1","sig":"5RWLBFyEAJcvgyBK7TfG86ZFo8PdV3eKVAFtp48SAMEkc1k8ewP4CsMyuGnEii9CEnqgBzupqpFLVg1jGytoU882"},"checkpointed":{"height":97471,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T01:46:07.554Z","checkpoint_height":97471,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}