Peter Butterfield is a Canadian conductor and classical tenor. In 2003 he founded the VancouverVoices and since 2009 he has been the director of the Victoria Philharmonic Choir. As a singer he has per
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 0xe35616fac41b5de33a699ee2defa33e0800e8ec1751b8795eec0e56e66d677b8. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f70c5ae-5817-4e84-8303-1b111970021d.json and https://artists.proofprofile.net/proofs/artist/9f70c5ae-5817-4e84-8303-1b111970021d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mass in D Minor - Missa in angustiis ("Nelson Mass"), Hob. XXII:11: Gloria: Gloria in excelsis Deo
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 0x10a32ed4367c32ecedcbf429eae33da44a259ec375309730941f6a0443217d3a. 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/GBBBB9606702.
Mass in D Minor - Missa in angustiis ("Nelson Mass"), Hob. XXII:11: Gloria: Quoniam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2f19c3ae02c0200202c4ac6c2b0800e8cfbe951a1727a62d952f4dde16faac. 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/GBBBB9606704.
Mass in D Minor - Missa in angustiis ("Nelson Mass"), Hob. XXII:11: Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f23a4aa7f5b964885d6c31bd0a3efa19917b595c86df716e4e8e4f73398e92e. 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/GBBBB9606709.
Mass in D Minor - Missa in angustiis ("Nelson Mass"), Hob. XXII:11: Agnus Dei: Agnus Dei qui tollis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abde20cdb8bf1433e3652a666295455892842466b7e67930ca299d07ac840f8. 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/GBBBB9606710.
Mass in B Flat - 'Theresienmesse', Hob.XXII:12: Gratias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f9ef14ab3a1a4ca4170fdba25361f28162d1fab23e54fa2a070fb2cd371bf7. 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/GBBBB9606714.
Mass in B Flat - 'Theresienmesse', Hob.XXII:12: Quoniam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7e3387e440d9b837ea7756ab6ea2c1bf19f362a21e701c343cd44b0559b1b5. 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/GBBBB9606715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a32ed4367c32ecedcbf429eae33da44a259ec375309730941f6a0443217d3a. 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/GBBBB9606702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2f19c3ae02c0200202c4ac6c2b0800e8cfbe951a1727a62d952f4dde16faac. 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/GBBBB9606704.
Mass in D Minor - Missa in angustiis ("Nelson Mass"), Hob. XXII:11: Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c403ff908ab3d16276725a85aa6bb275791a62bf1b238e849deac12f92d0b08. 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/GBBBB9606706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f23a4aa7f5b964885d6c31bd0a3efa19917b595c86df716e4e8e4f73398e92e. 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/GBBBB9606709.