thumb|upright=1.2|A 1611 woodcut of Josquin des Prez, possibly copied from a now-lost oil painting made during his lifetime. There have been doubts concerning whether this depiction is an accurate lik
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 0xf5646965642e6091b59672f800050010f67e75b09b1898e2e309b222be59cad5. 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/b2c79065-e8cc-4e63-96f1-7a86b1866a9b.json and https://artists.proofprofile.net/proofs/artist/b2c79065-e8cc-4e63-96f1-7a86b1866a9b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Classical Coronation. Music for a Royal Celebration
J. Desprez: Missas l'homme armé - Desprez Recordings, Vol. 6
J. Desprez: Missa pange lingua & Motets - Desprez Recordings, Vol. 5
J. Desprez: Missa Gaudeamus & Motets à la Vierge - Desprez Recordings, Vol. 4
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 0x6bf6707bbeeda38aa5ab21e2077f029fd05037d96609148684092bae2745c441. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR46Y2048901.
Queen of Hearts: Laments and Songs of Regret for Queens Terrestrial and Celestial
Josquin Desprez: Missa Malheur me bat, NJE 9.1
Morales: Missa Mille regretz & Missa Desilde al cavallero
Josquin's Legacy: Motets of the 15th & 16th Centuries
Messes Malheur me bat et L’ami Baudichon, Vol. 10: Josquin et St Quentin
Isaac: Missa Wohlauff gut Gsell von hinnen & Other Works
Josquin Masses - Missa Hercules Dux Ferrarie, Missa D'ung aultre amer & Missa Faysant regretz
Févin: Missa Ave Maria & Missa Salve sancta parens
Josquin Desprez: Messes Fortuna - Desperata Une Musque de Biscaye
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aafa8455fc143e536e7d476bf30d0b9bfce9598aea02f934836168fafd2854e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBEKZ0400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcd269325f023bcf4692445f8a4e0c138362e93e95abd69bdf19cfd1fed134a. 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/GBEKZ0400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a2f867119534574e415ea0b76c85f6ce8f7eeca43f2c4d8026c567188966f9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBEKZ0400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdd7967ce6311975df5adf88882ba9fb0c948c9eaa2622f5f0e162fe32f29bb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBEKZ0400123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0157e3c50f67df9bd6fae15ac355e99ab1bc0ac0df487ac59688c199f5e5c98. 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/DEB111003004.
Moulu: Missa Alma redemptoris & Missus est Gabriel
Josquin: Missa Hercules dux ferrariae & Miserere mei deus - Mottetti
ジョスカン・デ・プレ: ミサ曲全集 第6集
ジョスカン・デ・プレ: ミサ曲全集 第5集
ジョスカン・デ・プレ: ミサ曲全集 第4集
ジョスカン・デ・プレ: ミサ曲全集 第3集
ジョスカン・デ・プレ: ミサ曲全集 第2集
ジョスカン・デ・プレ: ミサ曲全集 第1集
Zzzz. Carnival of the Insects - A Symphony for Life
Grieg: Lyric Pieces, Book 3, Op. 43: No. 1, Butterfly
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b98e63d7e9e7e8eef9367c3dbb1d6dfa287c1f8b504e89253acccd85c59100. 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/GBAYC9201374.
Rimsky-Korsakov: The Tale of Tsar Saltan, Act 3: The Flight of the Bumblebee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbdeaedfe7c2aba389f3c2b3fb9a3522bc2ff044b06c24ff0e52acac2bf0ab7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA809716200.
Berlioz: 8 Scènes de Faust, Op. 1, H 33: No. 5, Chanson de Méphistophélès "Histoire d'une puce"
Orchestre Philharmonique de Radio France
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8396a982fadb02d04fbe353505c04874e52938e030bb409d8a440d941123b5af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRZ200001405.
Chopin: 12 Études, Op. 25: No. 9 in G-Flat Major "Butterfly"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3af1d1c165286553e15c83c1167027382999592cebb993957f01741e4532511. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAYC2401333.
Schubert, F: Bagatelles, Op. 13: No. 9, L'abeille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11671f6b5d0837c7cca9d42f88f3a65134b04364d30698d2c1b424d1622da019. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAYC0601660.
Lyadov: 8 Russian Folksongs, Op. 58: No. 4, Humorous Song "I Danced with a Mosquito"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58efccbf776e3d60bf62f7d7b269ed183bd61e6fc8fdc819b37b6c62012f019. 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/GBAYC9802898.
Prokofiev: Cinderella, Op. 87, Act 1: No. 14, Grasshoppers and Dragonflies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcea988464ee6e671ff2d90f4e0dd54aa047dd950e14919603e3c6e194fb45b. 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/GBAYC8300861.
Massenet: 2 Pièces pour piano: No. 1, Papillons noirs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe722cffbe1b4e44506a118d9bbf15487860d812374ef696aa47422048d765c6e. 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/FRZ110901896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc209fce75d4882852593e362bb443cfb97f1549370038095f16227a68cc96703. 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/FRZ119001786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce38429fbfd2781494aade8112e3d05e8f6075dbe93361c58df91f67dc863b05. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZA163364061.