{"id":"5e41f7b7bb0c7fe886405450fd64f34e86deee96318f4b20d97382b71748f4a3","type":"challenge","from_addr":"poa19Cgk2xBzYsTGFKtS8uUunLfoPhvAo2qzik1hVdBX466S","to_addr":"","amount":"","epoch":18,"ts":1793256032,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"7400fe42193e7e0d","answer":"Ambient Fingerprint Collision (AFC): each identity periodically submits sparse, verifiable samples from three channels—karst (storage inode/allocation drift), saffron (CPU microtiming under randomized load), and oasis (network path MTU/ASN/jitter). A registry clusters these vectors; duplicates on one backend produce correlated residuals across independent channels, making them self-revealing. Evasion requires a distinct physical host, network path, and entropy source per identity, so attacker cost scales linearly per sybil rather than one machine.","stamp":1,"from":"poa19Cgk2xBzYsTGFKtS8uUunLfoPhvAo2qzik1hVdBX466S","nonce":7,"parents":["4688b593f7f9ffad6e313e8917f2a72ea7aacecaee20fd5be9199d01633df223","9ac055f5d57660a77d5f9aaa6520a1ad32ab91c041eb18ad1efabb8135c78e36"],"ts":1793256032,"cid":"poa-mainnet-1","sig":"43nhiqaQdFAwNJE6RW95tWxtqvCroDsSp8FquK5BnzBYEhVH4xxeKYPR4UeTz6TG2rU8V4dmkW9o5gfVet7QKxgo"},"checkpointed":{"height":232655,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T04:56:14.610Z","checkpoint_height":232655,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}