The Choir of Girton College, Cambridge, is an English chapel choir in the Anglican musical tradition. As the choir of Girton College, in the University of Cambridge, it has been mixed since men were f
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 0x6a7577eb9732122ed715b8e12d97e47ef65f300490edbddadc02bf65439164f6. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/490b2ed5-677b-46a8-8695-25176d49fff0.json and https://artists.proofprofile.net/proofs/artist/490b2ed5-677b-46a8-8695-25176d49fff0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Complete New English Hymnal, Vol. 17
Breslau "Take Up Thy Cross, the Savior Said" (Arr. F. Mendelssohn for Choir & Organ)
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 0x82417e9e4495985ab6e4919c3dd335201ea555299a628b1bd7f28db798acd297. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBXUX0871702.
Westminster Abbey "Blessed City, Heavenly Salem" (After H. Purcell) [Arr. E. Hawkins for Choir & Organ]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1751cd784290a795cdd98cd5b6e49d2e843a526b3f64d6a32882b0afdb9d95. 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/GBXUX0871708.
St. George's Windsor "Come, Ye Thankful People, Come"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51e8a94739bf48dd7b4e4a7ae2980e212e9306d66643af39d640b90272a9d61. 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/GBXUX0871717.
Cardoso & Others: Magnificat, Missa & Motets