The Tallis Scholars are a British professional early music vocal ensemble established in 1973. Usually consisting of two singers per part, with a core group of ten singers, they specialise in performi
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 0xc084a614e5d52baedc9a707c3369d8c5cf35c8e425928a4e0e8540c01d3f3df1. 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/07c52eea-73d4-4d58-9e00-a6336c61c07c.json and https://artists.proofprofile.net/proofs/artist/07c52eea-73d4-4d58-9e00-a6336c61c07c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x0e9e9242bf13dafe74f65fa0442d32a8c6972ef99d5246590199d37e5179787d. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM8115241 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182585b10c929558f243d4aceab9c0b6270f09ee586202848a3a5360a07a9561. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM8615241 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 1a. Kyrie 1
Josquin Masses - Missa Hercules Dux Ferrarie, Missa D'ung aultre amer & Missa Faysant regretz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f658a1e898611ce1e865feb42a1438fad4b722879303035e0fb993856f26dd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005101 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 1b. Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42f45c6c9a8991952a9da82c55d6a326a62255efabf3caefc6d8bfac5c45ee0. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005102 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 1c. Kyrie 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4c2aa50e88eb8d5bed09b7ec7a05db03fe8dc31b7f8582b17b92fae244c225. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005103 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 2a. Gloria in excelsis Deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3ef0756378a7a5c791606eb492ec0fa0f10bc6e53386e0687b92e873d5b391. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005104 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 2b. Qui tollis peccata mundi, miserere
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf09c98a1570c22d7b1257db79cf131d8fdebd23b2ed3323c6eaa0449ce6dade. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005105 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 3a. Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d7054243c2382de13534f728572c57a2c734fe7adbeb9b1ba43edb6ed2e264. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005106 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 3b. Et incarnatus est de Spiritu Sancto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e13249b0eebf187a59c54da3310039bcb9d01e7d4da65799956dd49715d507. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005107 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 3c. Et in Spiritum Sanctum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518a3fb983fc5efd4e4b1c66f020fbb8b7ce125c2fc07bc4f4bf454d608bbb00. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005108 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 4a. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ab85b2d7f3aedf6402d309d2eb41c1b9ced1b439aa299e222fc31c3abd7914. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005109 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 4b. Pleni sunt caeli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa460aae11f7d55c927a84ac9e086bfbb6f50bb22f65c7cc61a2b16b2efe59ee5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005110 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 4c. Hosanna 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49111c27c909a33e37e4d5316cf378f0e56839f4e6e966dced291e86418b309. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005111 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 4d. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187883599969123d7af08f4e3b726b5c680ac3ec84fd82f092f343f35f0fb248. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005112 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 4e. Hosanna 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da6511f8b6dbac32bf18e88bf77251ce07b91f4cbc02827dc54ad848fb55605. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005113 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 5a. Agnus Dei 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8760051b6e0b8535a19bd55b0683718a4a152a740f967f118bb350efdb88100. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005114 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 5b. Agnus Dei 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e1fc4cbc46a49662169257c1d27b9ca47fc75f383f983599993c2788aa5dc4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005115 — a six-check JSON result.
Josquin: Missa Hercules Dux Ferrarie - 5c. Agnus Dei 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51606b5c8dfe54df2037989e3529cdf1d0d48e57bed29d92014c46eb5a35967. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005116 — a six-check JSON result.
Josquin: Missa D'ung aultre amer - 1a. Kyrie 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31173259ba7a2570672a65e28498ff757340d396beca8c719ca1590c9f8a373. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005117 — a six-check JSON result.
Josquin: Missa D'ung aultre amer - 1b. Christe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc9526e21904601e7164e31427d2e42e7090abefdc8759471df99657b513911. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBADM2005118 — a six-check JSON result.