thumb|upright|Agnes Giebel, 1953 Agnes Giebel (10 August 1921 – 24 April 2017) was a German classical soprano. She was born in Heerlen, in the Netherlands, where she lived the first years of her life
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 0x44a391a9ca09bd5136b78af1767c39ec90e345aac3c7a1056ffb377ed284fd3f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d25b0bb-4bda-4691-a00b-ca1769c9df7d.json and https://artists.proofprofile.net/proofs/artist/3d25b0bb-4bda-4691-a00b-ca1769c9df7d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach, J.S.: 13 Sacred Cantatas; 13 Sinfonias