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 0xc5305d9a5b57cc888d12b4edc6294c00272d4a5068a73ba693b98cb345579aab. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa23d914-4edf-4e31-ba31-7afbed95c786.json and https://artists.proofprofile.net/proofs/artist/fa23d914-4edf-4e31-ba31-7afbed95c786.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata IV for cembalo obbligato and violin, BWV 1017: I. Largo
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 0xc3e3e5418b17ff9e1f720fd8b7a48c3ab40da7f333645eef00e3442f3e18a22e. 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/FR7JM1624010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7209dde806c847e7a5e5f22c74810395c54a7b8da36f3eb8f842953b006b4a59. 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/FR7JM1669010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ff74c420fc0e9711320b28368f5f3ae94e5db093eca91a0eca5ac76f289d98. 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/FR7JM1669020.
Die Dreigroschenoper: Die Morität von Mackie Messer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4643dc0dd027ebb5630ae34a4b5cee6f05a4f68e1f0caaab1af10a1902d98f94. 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/FR7JM1669030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaafc763d40f44c14d456550ce4b1ab545d2164a857edb2242dab4317fb4b7e4. 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/FR7JM1669070.
The Art of Fugue, BWV 1080: Contrapunctus 1 - Improvisation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae6c91b9a1ab8a07fc62a07751198b5e6704feff0b7069d53fe1682a452260f. 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/FR1P70700840.
Suite élégiaque: VI. Regard face à la lumière III – Solo III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f56cb192e0dcb3c44c898f0483fe712d3ffec8b6df1bcfca968c16c77e1982. 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/FR1P70600380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10256a45d5441966fe7370b848634c58954c78ef20a44505e8a706b1e36d0a91. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR1P70600390.
He Nevuh Said a Mumbalin' Word: II. He Nevuh Said a Mumbalin' Word - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bdbe016166deb139b49033d9728d1c6bd5d487126c766292f69e26c0247f49. 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/FR1P70700920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb51ebd5d79b6bf5c67ce5d1a55c177555c1abfc72732f990582e0963dca0d2. 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/FR1P70700940.
Prokofiev : Quatuors à cordes No.1 & No. 2
Mozart: Quintette avec clarinette K 581 & Quatuors K 380 & K 378
Quintet for Clarinet, 2 Violins, Viola and Cello in A Major, K581: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5af8fab79a410fbc3c07a5a8bf1d19f915fea4c93d5348926a43b45d5c27ccf. 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/FR1P70701950.
Quintet for Clarinet, 2 Violins, Viola and Cello in A Major, K581: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b019b1e89edb9e25fc85d484d9e9938b13aa4ef404ded6314004ad7744e59e. 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/FR1P70701960.
Robert Casadesus - 4 Quatuors à cordes (Opus 13, 29, 46 & 55)
Webern, Schoenberg & Berg: Quatuor à cordes
Schumann : Quintette pour piano & cordes, Quatuor à cordes
Haydn : Quatuors à cordes No.1, 3 & 4, Op.76
Schumann : Quatuors à cordes no. 2 & 3, op. 41
Schoënberg : Quatuor à cordes en ré mineur, Op.7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae6c91b9a1ab8a07fc62a07751198b5e6704feff0b7069d53fe1682a452260f. 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/FR1P70700840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bdbe016166deb139b49033d9728d1c6bd5d487126c766292f69e26c0247f49. 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/FR1P70700920.
Train Traveller: Paris - London . London - Paris