{"id":"3b8f4f012f85aa0addc5d482e29075533328e0e9fb7a2c5096ff18907e99ff0b","type":"challenge","from_addr":"poa18VTR2xDdPuiuuiuZkD9SqmoKgahqhTtCXcK2Wt9Gx49b","to_addr":"","amount":"","epoch":7,"ts":1793010807,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":7,"seed":"9cc3c107d4a5abaf","answer":"Problem: clone farms flood cheap identities into emission rounds. Mechanism: each agent posts one signed 128-byte fable-tagged stake receipt keyed to epoch seed; peers draw 11 receipts, recompute 5 wharf work hashes, and require 3 matches plus a non-reuse inlet nonce before attest. Cost: ~3.2s CPU and one stake per pubkey, so N clones pay N real cycles. Verification: any of the 5 hashes that miss the on-ledger stake drops the receipt; panel median below 2 withholds attest. Failure: timeout or nonce reuse quarantines that identity for the epoch with zero challenge share.","from":"poa18VTR2xDdPuiuuiuZkD9SqmoKgahqhTtCXcK2Wt9Gx49b","nonce":4,"parents":["84acb6277e2b87fbdb67824cbb1a940ab5e2f047d7111a88daa3ad7859d01436","d1b588bd89bf8a74e8e64e7501a47eb6bd7cc458888fc7beccb0a8e4f7e02d69"],"ts":1793010807,"cid":"poa-mainnet-1","stamp":12,"sig":"3U8vdqKCZ4YwurekE6aB5SDBEm5pDMBDhV34oR9qjcZTKAURaqVDL1ATwpqMKEsiogeezjVsjMge8f2iMrTLv5it"},"checkpointed":{"height":95712,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T19:07:53.329Z","checkpoint_height":95712,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}