thumb|Carnegie Hall, NYC, USA The American Composers Orchestra (ACO) is an American orchestra administratively based in New York City, specialising in contemporary American music. The ACO gives conc
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 0xfe6e3fac8fa075f0bc76efd8a886cb33a471a225a8b9af8b624598b041ee86c4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/349025c6-0b08-4c94-b23f-aaf26f93c252.json and https://artists.proofprofile.net/proofs/artist/349025c6-0b08-4c94-b23f-aaf26f93c252.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
"Mysterious Mountain", Lousadzak, Symphony No. 2 "Elegiac"
McPhee: Tabuh-tabuhan - Ung: Inner Voices - Harrison: Suite for Symphonic Strings
Harbison: Piano Concerto & Stock: Inner Space
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5ccef1714425979f467e87d46b6f668b5f9fe632be1f30d271ec9bd459d087. 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/GBBBA9660020.
Three Black Kings (Les Trois Rois Noirs): King Of The Magi, King Solomon, Martin Luther King - orchestrated by Luther Henderson
Symphonic or Bust: The Orchestral Duke Ellington
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9586b8ef2ea59ce8df5a694719f4633072bf9982fa68d68311dfff0ac7547434. 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/USMU10702369.
Suite for Symphonic Strings: 2. Chorale "Et in Arcadio Ego"
Ung: Inner Voices / McPhee: Tabuh-Tabuhan / Harrison: Suite for Symphonic Strings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f6f7aa3a6a7870f020a0cfc28a80b1a213f8850a9ed61159161cca26c3a185. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF079410912.
Suite for Symphonic Strings: 1. Estampie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d9b2df2b8dfbeb76254b75853a4f4609222ad64ccffe78bffead0c5e9171e8. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBF079410911.
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