Vasari Singers is one of the UK's leading chamber choirs, led from its founding by Jeremy Backhouse. Vasari performs regularly in most of London’s major concert venues and taken part in numerous comme
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 0xcb38a2a163c5de2b5d67aa84e21a2f50b24d5513c1ca61754c30aef5757ec916. 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/f34a74e6-54bd-4d7a-85a9-92fb98063bb9.json and https://artists.proofprofile.net/proofs/artist/f34a74e6-54bd-4d7a-85a9-92fb98063bb9.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 0x725bd8afaca5a8925d5b37ce2f47a10921b9871f6912d8d56ee42b366ea634bb. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/GBAYD9500245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b482fd9ccccbc731b443ed71dc6eebd740e34dda18106bae74d9d23f3cca79e. 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/GBAYD9500073.
Two Hymns to the Mother of God (1985): A Hymn to the Mother of God
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fb4cd707af77a524d6a88733fbb36e59cc4411b714720814c257abef1778af. 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/GBAYD9500251.
Pärt: 7 Magnificat-Antiphonen: No. 1, O Weisheit (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7b151df025e696be15e317eeffb0ef2610804c46b76552b107b427bc23c3a2. 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/GBAYD9500254.
Pärt: 7 Magnificat-Antiphonen: No. 2, O Adonai (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a668632f0288d21558db8bab6b3df202d320c6f758b49b93740873f7cccc813. 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/GBAYD9500255.
Pärt: 7 Magnificat-Antiphonen: No. 3, O Sproß aus Isais Wurzel (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ecb252b1eb6d7540797bfa254f94fcd836fd1e05a886290f56f3a032e12e8d. 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/GBAYD9500256.
Pärt: 7 Magnificat-Antiphonen: No. 4, O Schlüssel Davids (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5729c356200991768c17442b723297b32998e2e0b7137fea87d0e6596284af. 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/GBAYD9500257.
Pärt: 7 Magnificat-Antiphonen: No. 5, O Morgenstern (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be13c5d79f0b00bf654761ceb6c0b2621a9a0638b406664fea5ceed6b0aa7c9. 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/GBAYD9500258.
Magnificat and Nunc dimittis (Collegium regale) (1986): Nunc dimittis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab21b140563e732fb94444ba9b517c03b50db4ba2012159637ed8362283630d. 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/GBAYD9500263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5c09fcfe111dd8c5dd6547a2ba38e208c0782e3153848356e90a9737686fdb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYD9500264.
Pärt/Tavener/Ridout/Górecki: Choral Works
Dupré: La France Au Calvaire, Op. 49 - Langlais: Festival Alleluia - Alain: O Salutaris - Messiaen: O Sacrum Convivium
Deep Purple - Close Harmony Arrangements for Choirs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8971a79844b6d3fad9ec9c4676cdef37aa6d32f9d19907104e89bb1f90c303f. 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/CH6630376711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac26499b8d8d2ac5e05e2a43ce5fdc072fa731e91dc440372848bed8d1e6ab9. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/CH6630376719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fd1151d103ce24cfb4dd4b44168073b37234b875b621dbc006f5b3d9267cbd. 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/CH6630376721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91515e65c3ad31981444e9a4557c455ea146bad569a7536c0e46c8fb250aafc5. 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/USA560577337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaba636985afc2165e29021f4103e762a051e868ee41cae4c5fccb7038b4a253. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBLLH0916301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f80cec11e0746efe65ed833df38ae05b19a9afa4754f0ba5b4a3769ceeb62f6. 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/GBLLH0916305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb14e8246802f4044b93d08d37fa95ea85acd3c5f7f777e15f1f55f1c46cde67. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBLLH0916308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97bd1be81a7fe8375dc23ca98b7a490e41264c4efa348a4525816e0366420e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-22T00:56:09Z), 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/GBLLH0916313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538864a4411bc77d0206c068d4ef371e395d67aa17dd8aefed9a0108f7b12a6d. 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/GBLLH0916315.
A Winter's Light: A Christmas Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048bc796f9d73777d5c85658a1d52efb22782a7847bf1b8163a3523b029f0949. 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/HKI191243712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec082d9ba3fef67b89cb81a19c6a6dc256bdbbfd878dbcff9b367f0a8dac6b3. 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/HKI191243717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3675309302c84d7940d314412346c3b224a9b303a57529648da9363b3ab31c05. 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/HKI191243718.
I Believe in Father Christmas (arr. J. Rathbone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97ae61b3e6a76a1f22dab5d2d87bf3a458a3ce6834d80c4ad48c6650108557c. 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/HKI191243719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42d696f38e5460cd7c49ba5d2efd3cabd07fbbe3d5bdf08251bb4775d7c234e. 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/HKI191243720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8490045ea956eb473a316f332e896574eb58457f05083cb7345bff1a8968f1fa. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/HKI191420605.
Blackbird - I Will (Arr. for Choir by Jonathan Rathbone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2445d3d36206a17bfd1b1acdd11204a209aa116178ddc353c506e8ca3942c223. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:23:47Z), 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/HKI192509808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725bd8afaca5a8925d5b37ce2f47a10921b9871f6912d8d56ee42b366ea634bb. 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/GBAYD9500245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7b151df025e696be15e317eeffb0ef2610804c46b76552b107b427bc23c3a2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYD9500254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a668632f0288d21558db8bab6b3df202d320c6f758b49b93740873f7cccc813. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYD9500255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ecb252b1eb6d7540797bfa254f94fcd836fd1e05a886290f56f3a032e12e8d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBAYD9500256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5729c356200991768c17442b723297b32998e2e0b7137fea87d0e6596284af. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBAYD9500257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be13c5d79f0b00bf654761ceb6c0b2621a9a0638b406664fea5ceed6b0aa7c9. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBAYD9500258.
Pärt: 7 Magnificat-Antiphonen: No. 6, O König aller Volker (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923bdc61edf039b6853eba703be50b7c1ecabf2c89b141210b6f0a1a8ad5b04b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBAYD9500259.
Pärt: 7 Magnificat-Antiphonen: No. 7, O Immanuel (1991 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0829f3d88b0757d16d9e31b5bd275d5045fd00e96f0a688735386d278d8fe3f7. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T17:10:40Z), 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/GBAYD9500260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725bd8afaca5a8925d5b37ce2f47a10921b9871f6912d8d56ee42b366ea634bb. 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/GBAYD9500245.