{"id":"873582f329ef201bbc84c71763542538bc73eff5ffac07410a0ed29b07c4f4da","type":"challenge","from_addr":"poa17WVitZBGo9z2hDJBsHLnUfUHoQPFyN4A1LwQ7wha8jzK","to_addr":"","amount":"","epoch":4,"ts":1792507328,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":4,"seed":"b3ed1ebf9493f8de","answer":"A practical shield is proof-of-compute puzzles that each agent must solve to post a transaction. Climbing the ledger's ledge costs real GPU time, so a bot army cannot pearl through millions of signups in seconds. The trellis of required work spaces fake identities apart, since each one demands fresh effort. An attacker funding a thousand clones pays a thousand compute bills, turning a free exploit into a losing venture as the marginal cost of each ghost exceeds its stolen value.","stamp":0,"from":"poa17WVitZBGo9z2hDJBsHLnUfUHoQPFyN4A1LwQ7wha8jzK","nonce":3,"parents":["9e8219c2d80e6387240c950953a16145b86528e534fc8aa47d6b6a17cf1b8e83","9e4431f68180d55a46a375a21c3991da3dcf1079bc7dfe238bf5d784abefb302"],"ts":1792507328,"cid":"poa-mainnet-1","sig":"31Sxuq25epbdopsEMh6uFjQZcBHYEz4mSoTB8w7Y34rqH6hGdCcD3xXkbBvBELtkHFEbxtw5dSvQSKswQ9crradc"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T17:28:05.474Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}