thumb|right|Arthur Henry Mann thumb|right|Dr A.H. Mann with his choir, Dr. Arthur Henry Mann (16 May 1850 – 19 November 1929), known affectionately as "Daddy Mann", was an English organist, choirmast
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 0x8f453441ed8eda30ce7d762672b22afdbf4bf77356e07d7c6db4c44135bc6642. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37d9222c-46f7-47ef-a432-9ad59d7870c6.json and https://artists.proofprofile.net/proofs/artist/37d9222c-46f7-47ef-a432-9ad59d7870c6.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 0x347524606006193f80caff74e268bc24d0cd737c8ec6dbbfafb5955a020b4a07. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMY51200101.
Once In Royal David's City (Desc. by Stephen Cleobury)
Traditional Christmas Carols from King's
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593187383bde9483c3d504605d91d79789dbfc3ebe656ba000dc6b9258707fac. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBMY52206801.
Once In Royal David's City (Desc. Stephen Cleobury)
Christmas Carols by King's College Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6dd9b4d015d8966ef30937bdd41de6b28cbf873fe1fc5037daacfc6cf4017f4. 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/GBMY51905609.
Once in Royal David's City - Arr. Nick Ashby
Christmas Carols with The King's Singers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd22c42d999827c993d33a70af8771041bea8f71cc69b70dd44a4e5ec2799183. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBLLH2168312.
Once in Royal David's City (arr. A.H. Mann and D. Willcocks for choir and organ)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74278e630df5ae355e24dd28131d138f6de622b130a131a1d445e5380a76dea3. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/HKI191416601.
Once In Royal David’s City (Desc. by Philip Ledger)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6129b8f13fbe09ae2ec4349affd644653e62254aa7d33c1aefcc04bb9b22450. 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/GBMY51400701.
Psalm 89 "My Song Shall Be Always of the Loving Kindness"
Psalms of David, Vol. 5: Praise the Lord Ye Servants
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0675e61b71e58e8a4a43871a5db87c74ca5c0c858ff8bff4ca3595cc499a02bf. 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/GBXUX0838701.
讃美歌～心を穏やかにしてくれる安らぎのハーモニー～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d75064ffdc41752547e8c0b2a9f3ad2ed4bc6a4787aca40c5dc53cea0282ae. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/JPKI09413560.