thumb|Stina Wirsén (2017) photo by Ulrika Zwenger|alt=Stina Wirsén (2017) photo by Ulrika Zwenger Stina Wirsén Hedengren (born 1968) is a Swedish author and illustrator. Early life and education Stin
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 0x42e3a0ecb1f4149f5489c4d73218267e6b79b0d0a4475b4366613284ab36e1b7. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3421e9d9-537b-41e2-93db-dd953e8e4486.json and https://artists.proofprofile.net/proofs/artist/3421e9d9-537b-41e2-93db-dd953e8e4486.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).