Engine Summer is a novel by American writer John Crowley, published in 1979 by Doubleday. It was nominated for the 1980 National Book Award for hardcover science fiction, as well as both the British F
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff369474afb5398c5af61d89be84a880c7a73add348e33319088927ac10fed8b. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96004ca3-e350-4ed9-b564-1902c66e08cb.json and https://artists.proofprofile.net/proofs/artist/96004ca3-e350-4ed9-b564-1902c66e08cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).