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 0xe3a7ec255d16dd10b30cb5ab9f7b38bd980cc5a284e930942e9768bd63860972. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/673f5d03-cac2-4b36-a4b9-222b2b3977a9.json and https://artists.proofprofile.net/proofs/artist/673f5d03-cac2-4b36-a4b9-222b2b3977a9.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 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 0x7853c0277bf3d8cb529220dbc6a41f346f11f9dee6525e0fd929aac65e89b487. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GBCRS0112601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5b1295b75a2a9c0160590cb0e25cd2bfa9781486ae4dd3c4f4ff65f0293437. 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/GBCRS0112606.
Helmsley "Lo! He Comes with Clouds Descending"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc31e6da8d7f7c1a3c0849431fae2365cf71fcbf6550ddae9e0d23e73be2c86. 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/GBXUX0870302.
Saffron Walden "Just As I Am, Without One Plea"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9e8b7476b83e90d8cde0020da52489f5c7eae3de7649cf9cc5e9a876801965. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBXUX0870316.
The Complete New English Hymnal, Vol. 20
Winchester New "On Jordan's Bank the Baptist's Cry" (Arr. W.H. Havergal for Choir & Organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569259d37ecdb80c3f1720045d27503ba265c36b79906a757447bfa465b704e1. 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/GBXUX0872001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085b0139f89cebc21814243e50deee85f36f7fe726b3d40ea9672605211a9919. 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/GBXUX0872006.
Gute Bäume Bringen "Christian, Dost Thou See Them"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846d4b602ced4e8bb36221d50ffe1d98cb450ebc3cabf0ffe5cfb6606d16d87c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0872008.
St. Thomas "Now, My Soul, Thy Voice Upraising"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0a945a5b4ea096b279e5fb19b5c3df457e99d402a95228fd8981776e186073. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBXUX0872010.
Iste confessor "Only-Begotten, Word of God Eternal"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931746ca8267641ae2927f0764f6b2385418e00279e33032a03d0a7d77768301. 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/GBXUX0872012.
Slane "Be Thou My Vision" (Arr. E. Routley for Choir & Organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5677ef3cde56db44ab08d8d043dad4aadbd5e44a4516d0acb35eed70bc1575. 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/GBXUX0872020.
Ellers "Saviour, Again to Thy Dear Name"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f324fcacd2e08ce01fa3d15198f56a14f5ad13cf8cfd87f4e4b94ba26df8b30. 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/GBXUX0872022.
Lord of the Dance (After J. Brackett's Simple Gifts) [Arr. C. Dearnley for Choir & Organ]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa8fa01a6e349571c8b3b14197cd547a0779f0724a9a6aebe2a39b75e6c54c9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBXUX0872025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6432996c716bda30498f8a6037ddb96a33e607742ed4445d022a1b7b4a7a3c8d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBXUX0855401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa336b1186ca02565a0dc4ab44fa71fe6d31cc65add174de7dafbdcbc96e1d47. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBXUX0855402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab56978abbe5a8695dd2cf4c9f4a52e890c1fd5c997198bbdd99da6807c2969c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBXUX0855405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e6191be4392503d8e027780233ff898e81a55957c18586c3e3a6f630350846. 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/GBXUX0855406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378849dd4b99ff2bf02244c98631b7e48ded58ca65ec4f735b22889db1979064. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBXUX0855408.
Evening Service in D Major: I. Magnificat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e6423d839aab16317218115d5e0064d445ea23ea1f82c4126b9e87c6284ab2. 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/GBXUX0855415.
Evening Service in D Major: II. Nunc dimittis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9dd9b14c0c295e839fa19b31087992306aa3fbc5371d568eddec03d8101046. 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/GBXUX0855416.
Choral Evensong for the Feast of Edmund, King & Martyr
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fac9a87ce674d1ee06838aaf2af465827aded290438079f0ce8cc8b661bf50. 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/GBXUX0849312.
Lord's Prayer - Preces & Responses: II. Responses
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58235f71d3698535c82f17811f0acc04d5b40c333accd02b939d0b1834d73a42. 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/GBXUX0849313.