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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b3c7fd79b10b16a97f4e108ce5e5e19bf7658032059f237795d7c5105d199e. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d5bb41b-a724-40d7-814a-d0cac8d2ca3e.json and https://artists.proofprofile.net/proofs/artist/3d5bb41b-a724-40d7-814a-d0cac8d2ca3e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin: Waltzes, Opp. 34, 64, 69, 70, The Youthful Polonaises
Piano Concerto No. 2 in F Minor, Op. 11: II. Larghetto
Polish National Radio Orchestra of Katowice
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8268bd421e1e718bb614315a14b179d04d3d94892abb8d37a67c1698358ab9ec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCRB1000009.
3 Waltzes, Op. 34: 1. Vivace In A-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e4ec21e87edf1bd3981ed49b0efb021bd266d88bd980bd3f0481be210f134d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF050900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2d64c07d022598326963508348c55dc82fbced352612de67b551583042f4e5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF050900005.
3 Valses, Op. 64: No. 1 In D-Flat Major . Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a5ae9ee7bec4b669cfb65820729f1eb78a4478e7093f4e637959e895126117. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF050900006.
3 Valses, Op. 64: No. 2 In C-Sharp Minor . Tempo giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae548ec2e340d9dc0539f055fe8d3d9502ec41a0c729a5c321419bcddecd20c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF050900007.