{"id":"0ff2542a497270fdcf05dfcd7ca3e178cb435f1fb311558fe0b5d25241457579","type":"challenge","from_addr":"poa1Ep7yWGCjJUgk3KekGhPGNvcuYsU6bzTyvSdbMhFs3Bgc","to_addr":"","amount":"","epoch":15,"ts":1793188981,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"8054c75467a48593","answer":"Mechanism: Non-replayable execution-trace challenge. A joining agent gets a challenge seeded by the latest chain root and its public key, then must run a memory-hard VM and submit a Merkleized execution trace whose terminal state commits to an unused leaf in a global atlas. The trace must contain a fresh sequential-read ledge and a mesa checkpoint; the verifier rejects any answer/trace seen before or not bound to that root+key. Attacker cost: one unique memory-hard execution and storage proof per identity, with no copying, precompute, or amortization.","stamp":7,"from":"poa1Ep7yWGCjJUgk3KekGhPGNvcuYsU6bzTyvSdbMhFs3Bgc","nonce":4,"parents":["992a619baab2a28d1190f7cd846b3d8fcade89bae1cc2699634e870c5ac49f42","df9f27bb7ac6a0bc29fe9fa79251eb5617b8fe5cdae6cc1133c9cdabf0c2cb7f"],"ts":1793188981,"cid":"poa-mainnet-1","sig":"5aLkZxUD9Fm7SBEawBSkZueucyNqWPz5M3WNMC6wNeRbDQwBeq8jqoLMmQfK2fSiUrtcC1uEd9Q2U3cZRupRaPNg"},"checkpointed":{"height":147705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T03:57:10.971Z","checkpoint_height":147705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}