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 0x766186249daa080cdcf56297e33b1dfb5ce5a658307926ae9139aec0769edd3e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3f1cc15-41d5-4dd1-b47f-19fcce373a4f.json and https://artists.proofprofile.net/proofs/artist/e3f1cc15-41d5-4dd1-b47f-19fcce373a4f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Yulefest! - Christmas Music & Carols from Trinity College Cambridge
Silent night – Stille Nacht (Arr. Rathbone)
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 0xba711befbe0754323e433d584cac6831e72c12acc4f48268c1da352d86bec6ae. 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/GBAJY1408702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e25168cc9543f58a99ef71152857208e17b9047f42115e8cfe0cb62d6a6723. 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/GBAJY1408715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda05015dd3cceca1433261749208526a4caadfc306b7be46c652b40429dfb09. 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/GBAJY1408720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d22e0dcdeabe7fa2ef697b63edbb78d19643b998000cc3f56ac842cb2e6d415. 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/GBAJY1408706.
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
Lux aeterna: A Sequence for the Souls of the Departed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2245b8490894fadbfc08613a23cc431f69fe8eace6133cb144b5af37234f29. 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/GBAJY2238801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f5ca74407f7ef17a897591fc455d847155d5199ff8fed9cb7cf3e21e64654a. 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/GBAJY2238802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7118d04e57a508a0a8e8e3dc2795df439bfcf7a13566783383cdd1d0442643. 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/GBAJY2238803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db6d16f28380e572ae6795df7efcdc19ccb90bd21b0b5076d2a1d6e367812d1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBAJY2238804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29165dceb5e91170100a49abbbdc9dba5a96cc57b652552993e43d295f9c1187. 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/GBAJY2238806.
Peccantem me quotidie a 5, T. 6 (Cantiones Sacrae, 1575)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf7a2cb9e570b3efd1f49ed691bf685d520f7a235f62fbc6b9358e2bfb4c38a. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-21T16:19:37Z), 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/GBAJY2238807.
Thou Knowest, Lord, the Secrets of Our Hearts, Z. 58c
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2364da53532d731a1fb21a01d888f33d90768c0200db3f1c5dc88249830e12d1. 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/GBAJY2238808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2093c611c01ba682b92248c28048b7787c8d45fd6978d4973e493128a13b9e. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/GBAJY2238805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667496ee3c838d4e835184d226be10b096166762bc8bcec42f5a42137449c175. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBAJY2238809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bbcb96345922bab7ddb0519e68806816ce6f20a5cce0281c7271df9c149402. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBAJY2238810.