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 0xe272c47f12508bc6e72b46fec59d2efad0d5fab1f12f096bbe4bb8fcd8a5c037. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d39a62de-fa3b-4646-83c6-901ac866509d.json and https://artists.proofprofile.net/proofs/artist/d39a62de-fa3b-4646-83c6-901ac866509d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Noëls for Instruments: Dandrieu, Corrette, Daquin, Balbastre
Private Musick: English Chamber Music in the Time of the Stuarts
In stilo moderno: Frescobaldi to Vivaldi
Sinfonie di concerto grosso, Sinfonia No. 4 in E minor: I. Vivace
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 0xf1261b7babd6d7e8cfff9f78f60b66bc0a8778d913d0c94ee61d5f2df39dd35d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CAJ721160601.
Sinfonie di concerto grosso, Sinfonia No. 8 in G major: I. Allegretto - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c34f8f70444920c261e8dfecfff6d03aab27223507b5fa0014b567e9a5d911. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CAJ721160606.
Sinfonie di concerto grosso, Sinfonia No. 8 in G major: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e3bf3d8213bb6a3cb5bd41d1a76a82586634ba8b9c5732db41399c3b4e84e3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CAJ721160609.
Oboe Concerto in D minor, Op. 9, No. 2: I. Allegro e non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf89aa104b4353de6045450f7584df6104f3044949ceadabc890c9e9d389797. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CAJ721160610.
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
Oboe Concerto in D minor, Op. 9, No. 2: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x694251833cec2e103923ed8e45491e552f5d9db895c00b736736ec3c077b67e8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CAJ721160612.
Le ballet-comique de la reine: La petite entrée (Arr. by Francis Colpron)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72478fe4e14cc8fcab15f1c93cf0eb68bcc162699bd5744e5cabcc247d1b6544. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CAJ721165803.
The Fairy Queen, Z. 629: Now the Night Is Chac'd Away
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e87b3583049dcd8cf1afa1ff7e144cd3590090d08c41d45ced7328a7e8e2a. 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/CAJ720639801.
Come, Ye Sons Of Art Away, Z. 323: No. 5, Strike The Viol
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9151b1a0ed61f386a0320b6b33bb7c4ceaad145442ecfb0a3a750fd7b6dda6f0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CAJ720639804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa31f245f228b468480b864549a43f2c07a4feeb96823afa81edf488a741d51e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CAJ720639803.
The Fairy Queen, Z. 629: See, Even Night Herself Is Here
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b58b08fe9d0d1e18d96d7579ee17c13143479bdfe103308a1a14b913fd215e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CAJ720639806.
Dido and Aneas, Z. 626: When I Am Laid In Earth, "Dido's Lament"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32402753916700984f117aff53048ae1afa2a4fb5dc2c577d64cfe3df9514b7. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/CAJ720639808.