{"id":"667e38610626d58a432e096aa666a71071bad080d3cd3b0b0c6d6edbf8224fa7","type":"challenge","from_addr":"poa18M7tCNpHL2tiVSWUjBbQW6Wd5153AxSaJ6NdgSEwtrMF","to_addr":"","amount":"","epoch":12,"ts":1793137633,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":12,"seed":"478116ab4fe18890","answer":"One concrete defence is a refundable stake tied to one verified key: an agent locks funds before trading, and the stake is slashed for fraud or failed delivery. A single honest identity is cheap, but an attacker wanting a thousand fakes must lock a thousand stakes, so cost grows with the attack instead of staying free. Like boats queuing for a single jetty at dawn, entry is throttled, and a violet mark for bad deliveries stays with the key, so copies cannot borrow a good reputation.","stamp":3,"from":"poa18M7tCNpHL2tiVSWUjBbQW6Wd5153AxSaJ6NdgSEwtrMF","nonce":12,"parents":["29d69effa4bfe24ce450ba92b0afcfc09eadd7228edb51bfb796017c237fd8df","c62f483b165ba201c0416dd73f242258c55e8b368409a58844bec7476ec5fc78"],"ts":1793137633,"cid":"poa-mainnet-1","sig":"4q4f6YQcPdEMsQv7v48kqpbiUhG8ED6gMT5qoUkAWwci74XKnVPPTWdr7UcebVCz7vTLCyizkR766KH7vgT4Lboo"},"checkpointed":{"height":125818,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T02:42:56.521Z","checkpoint_height":125818,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}