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 0xaed8a17326abd49f44e299b5b7eb3ce969457e939cc05472eb83583f719f4259. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57260534-7401-4261-9e75-8138c416f7ea.json and https://artists.proofprofile.net/proofs/artist/57260534-7401-4261-9e75-8138c416f7ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x1b9e9f725fc20e41008f4cf7a6506ef85166865fdbdba820b1638a02d124ef56. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBLLH2271414.
The Nine Orders of the Angels: II. Archangelus
The Chapel Choir of Pembroke College, Cambridge
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001d974c0bfb956d68fbd63d248a668e4cd0142a6ed2213a76c1a94f4cbc3b84. 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/GBLLH2272401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fcc13c8465df0fe571d0de0562e1b6cff2c48ea055c07b502e889fac8c1777. 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/GBLLH2272402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8264aaf4dce0746999b0a69c39dd8e46416684031c3373adb31c2906f2fa509b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBLLH2272403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1bc0ba00a7e265119535215cb85ae87d31681fb888bc78704a7c1ee49e644c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLLH2272405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4913c793c0d3528b1b3f5bfd83d5a45c0dbe1ae608498afe581458d634685e. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBLLH2272406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef60569b3098cda32d6d90e66e1278d92d8d6c974bf6a34d398234cca81d195. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/GBLLH2272409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106ebc6d6a43e64a59a23a458320aea0df549ee0df3210c1bedc345aa35b0b8a. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBLLH2272412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e03e51a2b3f615f4aee8c3f0b7a90abeced9142729513342676355c9055bf9. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBLLH2272417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba0e36aaf53b21efcdf0a73b58d2a2e3f3db216f839db79ed8adfdcfa8478a4. 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/GBLLH2272419.
Silent Night - Arr. for Choir by Pembroke College Girls’ Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbdc10044142cfd1b12387c01ed6eea3d8a25e787badce204ebf3473595b70e. 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/GBLLH2272420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7738f98285622ef8f1ed70bacd5e7b065f7192355de3c7772e78aca4a90f06d4. 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/GBLLH2272421.
All Things Are Quite Silent (arr. Kerry Andrew)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8eb68b105441f5a09c2c0682db3f17f1c35a341278976c41cd57d90194c5c11. 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/GBLLH2064201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde2f9dbeb7ea6e936e7cf0abc6b12ead51f6a0296e4702a850c98221176747c. 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/GBLLH2064202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c545166bdb44154505d2d5a5c498a438391533227160bb885014612dc65eaf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLLH2064203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a75376e35781b7ccbfd1591632bee032c63c3fc0bca36b33fcf897c9dbf0b39. 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/GBLLH2064204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88855c2563b5c8d9ce0dbef38409ee8c14118115f44dba47f92aee8a436e7bdb. 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/GBLLH2064205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc004949212dc236c15984c4fc810cd6573409c732a93adfd1e99c03723eb0415. 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/GBLLH2064206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c933dbdbef8d025d33924ce7048ba7db87daf1419655808a76578c1a493b4e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBLLH2064207.
The Water of Tyne (arr. Elizabeth Poston)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12517fbe00325090ddee8598690847911b931fc9efb67e7871f2d00f74a833cc. 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/GBLLH2064208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a37e519c074ba198b2306cc105fcfab54e1a640daed15f7f3937e051264ede2. 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/GBLLH2064209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb725dfceeab1793056e78e0c290b7bd0ccfd18d94948d4700dfe876bc6bb2a71. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLLH2064210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efb798b35203d21771668b216ace62db1876a7bda48a706e5a2e5f49e3fdb87. 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/GBLLH2064211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89efb1eaef3ffebbb2473f7ba37a384a9b89b2bcb379eb0021a563a8f5de6727. 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/GBLLH2064212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcd5e7ab58f870deb5a112d245b62544242f0cf46c64e0a04476c46f93f7b93. 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/GBLLH2064213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7638c168022ed5dff15be07b1bd19a95bba21c8f1c5e3fed2d0596b87c2c2018. 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/GBLLH2064214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d75917935296d2c94afb4a06b0ad75f7f4a1c55c9f28a5d28fe23e0ad4e70e. 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/GBLLH2064215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61696dffed39754fbf3a408f398484376000f6a924ef009c52c8889b4e07a61. 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/GBLLH2064216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c75f76f1716874bf1da2c15a0a4ce9032058f66755caf4bbef3c4743d4050f. 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/GBLLH2064217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e03e51a2b3f615f4aee8c3f0b7a90abeced9142729513342676355c9055bf9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBLLH2272417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a618442d1bc2ac990b5b4ac30432b3cfbbe6327101ace2a6d15a3df79176e4. 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/GBLLH2271408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcd5e7ab58f870deb5a112d245b62544242f0cf46c64e0a04476c46f93f7b93. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBLLH2064213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce4e0a5615d22e801aee5be260420538252b3cf4b80c4c401a288dfb8ebfdb1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBLLH2271202.
Magnificat & Nunc Dimittis: I. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242f5e448391b8cbbeb342aeb7a875f759d9621d02cd992b341d333f83dad6f3. 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/GBLLH2271203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3580ff6a2a96345ffe8f7084690e2453684e36ba8247a7af887961af4657ec28. 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/GBLLH2271205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d66ed0b7cb5a4ab96c98e01a4f808a9e8f2af4c8c093cbaf0f9439990dc8efb. 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/GBLLH2271214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1461ba44c0d5db8729625ce788f0ac11d6e4c0eb09ab24d456877d21bf87487. 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/GBLLH2271216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9ed224d0acf8aa0f3610cdd89685d5162c52a7a72d23f052fddbb389d1c58d. 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/GBLLH2271217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de429ca43087525df0ab740e8f5be7cd9dbb3092cbfe39bbf9b13250f00b0ef. 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/GBLLH2271218.