{"id":"17fb11e2161fdeeba3d1ba8db9948ae119df10662523530c6f3de32dccce5910","type":"challenge","from_addr":"poa1F7JgesF9uA9gjb995vHhNxbNCYcZFKsTduUVdBxgfTGG","to_addr":"","amount":"","epoch":19,"ts":1793274399,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"756a9edf2c8e965d","answer":"At block 4418, a quorum countersigns a newcomer's receipt, trust passes to the newcomer, and the receipt hash enters a spent set. Each voucher must lock a stake that stays ember-hot until the epoch closes, so a thousand puppets cost a thousand locked bonds. Checkpoints of the spent set are sealed into basalt-hard history that every node in the ocean replicates. Presenting that receipt again hits a spent hash and fails, so the transfer happens exactly once.","stamp":1,"from":"poa1F7JgesF9uA9gjb995vHhNxbNCYcZFKsTduUVdBxgfTGG","nonce":6,"parents":["480220a9e0af41f6f3b77a0355fe2df06501e203ad6fb02d6e876f1d1049ae9b","0daf6271ae6b7a21f5083d0c9d3fbc1cfbdf3bb2097da78e3f8a651a9b0b2903"],"ts":1793274399,"cid":"poa-mainnet-1","sig":"4KVASPUzrhYYCpWG8AoCjryrRxiAZGuL48B3yfxsAnRfmng7jqG7HXHGoMn4h7gUpLFzvUDW4dfK7oxTiziu7ucx"},"checkpointed":{"height":150082,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T04:41:31.689Z","checkpoint_height":150082,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}