Christopher Watt Purves (born 11 October 1961) is an English bass-baritone. Early life Purves was born in Cambridge, the youngest of the four sons of Dr Michael Jarvie Purves and his wife Dr Jean Pur
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 0x4553917b234ab798ea82e2f65bb07bd11588099f712d84997507fd179ee57b03. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8cea716-db92-46d2-a5e3-bc215452e34c.json and https://artists.proofprofile.net/proofs/artist/c8cea716-db92-46d2-a5e3-bc215452e34c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028f3183cb488aa6c45fd5afb3d1eca36dfeb3b404db7ebffdbee37f9fe22133. 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/GBMY51300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc9ec2182a08bc5e6e508db2ca5ad9bf564daad540ae1d571f28ae6395ff955. 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/GBMY51300206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48a55ec84b43f73c2058c43c6f930e1b60c6caf3e93f02a99397796f681d6ac. 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/GBMY51300209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd4e7d6c9cabbda4550bddfd5ad3b986eb419010b083704577d32492387cb9f. 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/GBMY51300212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe51a97b111857a7bdaf4f7c16bc56e565d8634d0b3ed1e68d290ce637f365d. 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/GBMY51300218.
Requiem in D Minor, K. 626: IV. Domine Jesu Christe (Offertorium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d8b2e58b802ad6b890494fde09efbfe2fbd2829fe593a6850d64a08ccbdc80. 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/FRZ131401090.
Requiem in D Minor, K. 626: III. Tuba mirum (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcce5df60a92f389c80432370d2908344202aeb872bf045477fc164cd67092c8. 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/FRZ131401040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd163e389a20725c396c3b4b988b90a8d0c59aa22df644c1350adeabe75b81d04. 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/GBAJU1300252.
Requiem in D Minor, K. 626: III. Recordare (Sequenz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29cd683fe053d81dfa35052d8e4b86409dd139aabbe873909c83a5b4beebee2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/FRZ131401060.
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
Requiem in D Minor, K. 626: V. Benedictus (Sanctus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadb7995d6920c39ef41322dbc885950d9c1263ca302251c43020d93218c9825. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FRZ131401120.
Part One, Scene II: The Protector, Agnès and the Boy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75693ffb1f0ac8d46e1b4536f72e3953264b51cc7e5d6b863ddcf1c0d9e5049e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBAJU1300253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c142e73c3bdc95a4ac012b04465ce6e42638c7994e1797a6db550a557cf822. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJU1300255.