Oxford University Press (OUP) is the publishing house of the University of Oxford. It is the largest university press in the world. Its first book was printed in Oxford in 1478, with the Press officia
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 0x7e0e3aba343bbd50b54397927e974515c1d841a55c5c6511e69d5772d567039f. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d48355b5-1021-4d31-b795-cbbaac80722d.json and https://artists.proofprofile.net/proofs/artist/d48355b5-1021-4d31-b795-cbbaac80722d.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 0x7b527aeec9a2bc77d8e2d7bbfc40784f05ed61934603bf150a89f7b0fea560da. 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/GBN3Q2101895.
The Arrow and the Song - SSATB with alto solo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fc9be93fcdf0ac3166d46d76830b351b4cb6758e1750e412029395fc890e7a. 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/GBN3Q2101900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b2a502574fa4e8c08dc7b78ebbe7815f296dbb881d3883b09cde1b37134922. 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/GBN3Q2101903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766cbde57e195edb968a02b616de8f5294ccebb5fb69df9d5b55d8d29c938c9f. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/GBN3Q2101898.
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 0x3497468f8c410e54fb35ecb9e1f9a1f501d0c05fe3e09c6a8797ffda209df908. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBN3Q2101899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5246b8ff88b0d35728486fc236b2b171ecbd32d25c59496d9efb7ccf8bdd53c2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBN3Q2101902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f507c05ec1c7d1ee0c35be85e695c668deb4ab4bcaf8a5b1b419849094c1a1. 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/GBN3Q2001855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b8659a94a9e9cf08ab1031fbee5a9a112fdbe027e53e1da3d1ddecb2798652. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBN3Q2001857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9ed0daddae5138084b94f5869cca451129789b64d24ff5cb1e7f906235c987. 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/GBN3Q2001815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fd907a473642baacfd39aa46f5b6b0dcd20cafdf28611e561b784c66d3f0fd. 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/GBN3Q2001819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0fedac213f6611e39ea43c8cf53ab9a4e5a32aef3b446dc5537c933db8071a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBN3Q2001822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4a5e6385568d7f379224177d7460a56bb5a894214625f1c84bb01adce84b52. 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/GBN3Q1901661.
Hope is the thing with Feathers.wav - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d1ab10d90cb2c3304f44573a13094c98542f277c940a651de4403f6223a30d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBN3Q1901660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba993aed1f4dbf7cdddf85b9d39514596f6cbd1d18bd867afb9abf2f807e0d4. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBN3Q1201622.
The Oxford Book of Flexible Choral Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8b87c35755aa61abf2278a987e8fc93177aa017b9d867925847d0ef2e096ff. 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/GBN3Q1901592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c892d07e590385d579e1db4e2f7e2ff2ab981f741dcada9a1c588bffb63915a. 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/GBN3Q1901595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5434e7ae559543ccc70a074cf9dfa50f3970d50cdbfe0f0f1d3cf241c841477b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBN3Q1901598.
As You Sing: 9 secular concert works for upper voices
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bdd77fa0239bfb7793402ef4233b14384d6bf00028e7c59eac0e5f3cfbd6f1. 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/GBN3Q1901522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ab8305addf24168ce5c41f5c06d02a3cae232e7b7d8f865f6f68baf21f548c. 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/GBN3Q1901537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c297acee8f8bade68a00e0764d530dc1c2f8759f4ab5461a7ab9b1f922b2732. 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/GBN3Q1901545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e7b3d4beca8d8ebf9b7288d4e14b605d8367cb7bd8672d3b45f8d905f13eb. 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/GBN3Q1901546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975fb34419a01100e8dd14c68ba13822735daae85714cdf3c8d3336795a43452. 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/GBN3Q1901551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a4faa34f8fce07c139d7785c2977968f6e165ed94b029d7d20004e8bdfe166. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBN3Q1901540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c91fd81066546ecf5935ed6897b666543eb5fb49fc15a4ba1f913a021f2db59. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBN3Q1901543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd83ebdb4f4cc7e6a24ab084696748978a3edbbb92e84534cf46dd305621e55d. 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/GBN3Q0701629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0128278026ff828d48bd6aa49c5eb0ab98fd9f417a86b90cf799faf56dd8d88. 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/GBN3Q0701626.
It was a lover and his lass - Upper voices
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6d4bdac8f0cf584d7b740bba55e10bd6b4839d9e2c965e89f9559fbbcfa8e8. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBN3Q0701627.
Choral Music from Oxford with The Swingles
Choral Music from Oxford with The Gesualdo Six
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7263567db63d932b907a3cffb1fc74ce0d41281501b24aa59db91cc50fca91fe. 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/GBN3Q2101889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd49e94b8a39f6c3013c7948a592c1dea932650ffae6099b74dd083e5efd3c9. 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/GBN3Q0601475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad091abf400eff9415fbf21a846503afa5df6db30ebe4b830b0947080e8675bd. 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/GBN3Q0601476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa39e13d230e1dda6e08caccbb060f65b7e8a5b9a4b35051b3d339bb4ba72322. 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/GBN3Q0601477.
A Little Jazz Mass: IV. Benedictus - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceab95a1daf18328588f952d6d1bf1d35fdd9431dee277cb39affdaf16f44c93. 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/GBN3Q0601478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c663fbdb0a80904144bd971e9b3536701341c054b3435e3aacc31cd6dc1139c. 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/GBN3Q0601479.