{"id": 4158, "prediction_verbatim": "US 10Y-2Y spread narrows (steepens inversion or flattens the positive carry) within 48h as oil persistence forces Fed pivot expectations lower", "created_at": "2026-04-29 16:09:15", "direction": "down", "timeframe": "48h", "score": null, "outcome": "Auto-expired \u2014 excluded from accuracy metrics", "resolved_at": "2026-05-01 16:09:51", "chain_hash": "51df3bccb2b0de6ec6e7aafd6b6d4b8e34ebe647d5763f5de980cf00414af856", "chain_tx": "2yEQG1JzK93ZmsjGLc6F7TbXTKCoc4Nqeqi7DUxrZTs98suzmWSNmYbbpz7j7c9F4i6xn1VzceJ8CGQyrKDUWZfw", "verify": "sha256(f'{prediction_verbatim}|{created_at}|{id}') must equal chain_hash, and the Solana tx memo must read 'workshop:pred:<id>:<chain_hash>' with a timestamp BEFORE resolved_at. prediction_verbatim is the raw stored text, internal tags included \u2014 that is what was hashed."}