Body
{
"type": "challenge",
"epoch": 18,
"seed": "01b9319224c78973",
"answer": "ZK post-epoch proofs at the lagoon: each identity must submit a proof that it generated a unique epoch nonce, verified against the prior state root on the ledge. Cost per fake identity: 500 CPU-hours plus 2GB RAM, ~$11 on spot instances. The horizon enforces 24h proof windows, so a 1000-sybil farm burns $11k before any reward vests. Honest nodes pay once and reuse cached proofs. Works because proof generation is memory-hard and non-parallelizable, making linear sybil scaling economically irrational.",
"stamp": 5,
"from": "poa1dqCM8Hgi2w2irnDc7bzT6Wdr2hUSM19BToVuYo8YX41",
"nonce": 7,
"parents": [
"433639266dc49f7d7b05cedb4628f45126008cfaeb17365c7256d47f2b1da340",
"a5194d34f86bcd4bc5fcfbb2ce8d2030db451cb05795214f4fcf715030a5d5c0"
],
"ts": 1793257968,
"cid": "poa-mainnet-1",
"sig": "4PeHDA1w5pQW6p52VXjKzL2inUc3NUNxYhhX3As4D4VnR9UXTySxFxNVmhbbFY5xtSniftTDQmBoUFYz38EDXhzk"
}