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 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 0x233e882d0fc954aff8954082da3790d6493ad6b30acedfef1a97ecee8bef0812. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d9d44cf-b4e0-46a1-8ef6-708fa5565151.json and https://artists.proofprofile.net/proofs/artist/7d9d44cf-b4e0-46a1-8ef6-708fa5565151.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Missa Dunelmi & Other European Choral Works
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 0x7440046063195b9951a051fb903c1fa854d3a5eda28990d79524f93e33e34e66. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX1412607 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653283d9ed1f659ad3a8c2d3ad32e8fd3e06dd85f6f9bfdedf50798cad5a64b2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX1412619 — a six-check JSON result.
Choral Evensong for St. Cuthbert's Day from Durham Cathedral
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539908e0d1707f529320473213f0c992cb7971d4a17bf644d357ceade14d87ad. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0802905 — a six-check JSON result.
Tudor Church Music from Durham Cathedral
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dfd3b2d77da1d0f8273c444f3125a4c0a1f440793a4bbb209487de45769839. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0880114 — a six-check JSON result.
Stanford: The Complete Morning & Evening Canticles & Offices of Holy Communion, Vol. 2
Stanford: The Complete Morning & Evening Services, Vol. 1
Morning, Evening & Communion Service in C Major, Op. 115: Va. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd53186e37b9ce74a1f7edebcbcdaa000a127c3088383ad822fa476267cfec4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0843721 — a six-check JSON result.
Morning, Evening & Communion Service in C Major, Op. 115: Vb. Nunc dimittis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec665f2d43822a0b51914d8f8f3e8899e34a0e6b170dffd2b8f213bf818f039. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0843722 — a six-check JSON result.
Psalms of David, Vol. 3: The Earth Is the Lord's
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01c4629f591aa1bd4aee061329ec850a963abd88a0cc212b3ec1aa14c45e841. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834301 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82cff60b2d864b81d1ed65877518941693db08863da28eb40a4648b87c5c06c5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834302 — a six-check JSON result.
Psalm 18 "I Will Love Thee O Lord My Strength"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4390369b2c8f72735b7ec4243e860b50177d9a975f8f230463c734f421f01082. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834303 — a six-check JSON result.
Psalm 15 "Lord Who Shall Dwell in Thy Tabernacle"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ff07a718cdb7fb155603c638b4e089f7e92f789ee492534a2c2a0b50d38b07. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834304 — a six-check JSON result.
Psalm 46 "God Is Our Hope and Strength" (Arr. for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa755d037aa9aa30a5ebd64079d02a0b7a6f45a30c3b07280acabb1818fc7eedc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834305 — a six-check JSON result.
Psalm 39 "I Said I Will Take Heed to My Ways"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147044bbde33b54da99b4f40a1714b03b2573f57ef6f881c403c481fcadd9dac. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834307 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd6c0928c832a82ef60476f011853370193fa1eb526f23a4a05bda537c24bec. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834309 — a six-check JSON result.
Psalm 101 "My Song Shall Be of Mercy and Judgement"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121ff0379364dbc438ae940d1876fa09d72cb4b2dc574a661e181c4728b90fb4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d2cb51923efa2217314cb8cae4807ae44ca178ebc6869fc5068b3ab4176036. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834311 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386069a73ba9d1a8a0dd326ec11605b1cc29b604f0bc2e08819302740c756150. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834312 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa962b8613e99631ba46a211d2562c5704e5ab6d82e1019662d7bc9d45f425f8d. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834313 — a six-check JSON result.
Psalm 150 "O Praise God in His Holiness"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a761c74320d40baa5a60691db395acab3fc60e8e8f001f8efada5bac95cac16. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0834314 — a six-check JSON result.
Tavener: John Tavener - A Portrait (Mccleery)
To a Child Dancing in the Wind: I. He Wishes for the Cloths of Heaven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07beb09c2644ab0dc3dfe433f719e22164ddd79af3c7a75d48457190b3a1b6df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190334002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf954dd3a0bffbe88fa25538ea4bca32b51ab67d428e2d6313910fd9694b997c1. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190334102 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f0b6f81fd09f2209a9d5e5aba194faafc20087288f7d2c7c1888cec541c5cc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190334003 — a six-check JSON result.
The Magic of Christmas - 80 Great Carols and Christmas Songs