Joel Cohen is the name of: Joel Cohen (musician) (born 1942), American musician specializing in early music repertoires Joel Cohen (writer), American screenwriter Joel H. Cohen, Canadian TV writer fo
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 0xe7286dfd2459af4592273064ebf38f716fdf616e25e94634ed05a7a656daefec. 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/352a2c0a-ce9d-4a17-9402-554e14c4de11.json and https://artists.proofprofile.net/proofs/artist/352a2c0a-ce9d-4a17-9402-554e14c4de11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
L'homme armé. Musique de guerre et de paix, 1450-1650
Encina: Una sañosa porfía (No. 327 from Cancionero de Palacio)
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 0x460566f61580a3856debb4cc662b5d5c99c33429e8f355c6c7045ea596b8d6a0. 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/FRZ208402303.
Monteverdi: Ottavo libro de madrigali "Guerrieri et amorosi": No. 1, Altri canti d'amor, SV 146
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc37a9d93de0999cf3aa6752d46c47de1de4e60c0f14afeeac90e3b1292dc6c. 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/FRZ208402304.
Gabrieli, A: Concerti, Libro II: No. 66, Bataglia. "Sento, sent'un rumor"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de2bb8f790118784768e80f07939a36c6c8b8f6d1ca0f70aff42ae77359ba14. 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/FRZ208402305.
Schütz: Symphoniae sacrae I, Op. 6: No. 13, Fili mi, Absalon, SWV 269
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af880891c8dd51538efab906e2040865272f59c1789214fdc4b16293d522178. 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/FRZ208402309.
Rossi: Hashirim asher leSholomo: No. 16, Kaddish a 5. "Yitgadal veyitkadash"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf764eb6ebbd753789b733d3ac1bb0961cb2d5e9da7222c2f972e750c550e5d6. 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/FRZ208402314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724e00e396bcbb28f709fd018f2b52ed54965d38897a5ed1ea919528105f3a5f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208402301.
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
Morton: Il sera pour vous conbatu / L'homme armé (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb60efd933f43e6892b890f82f9368b22ef2589437bf9f5ecacc6e3c398fc44b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/FRZ208402302.
Byrd: The Battaile: XII. The Buriing of the dead (No. 39 from Elizabeth Rogers' Virginal Book)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52d3acfa4c377c397a86b29e9090f9dd296d49742cbad26cb78dfcb5c911b96. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ208402307.
Mudarra: Libros de música en cifra, Libro III: Romanza II. "Triste estava el Rey David"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e053937f47d17dba00bb02b5a1bc36fb15b5c6e5c02345e80748fe0c2660c5d. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/FRZ208402308.
Luzzaschi: Il secondo libro de madrigali: No. 18, Quivi sospiri pianti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860c4db777f209c71c4726188ec4e06674334cd071edaff2ec1797f68cb8b5de. 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/FRZ208402310.
Lasso: Magnum opus musicum: No. 414, In hora ultima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468463aad17e7518139044ff8bee155e25282f265c0097b9e00a68de2338ca70. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208402311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38801b15ace3d8bbbc7ef3d26b4d1a4a2829b1119d3d3280ac15b8254e5f5f6c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FRZ208402312.
Goudimel: 150 Pseaumes de David: No. 13, O combien est plaisant (1568 Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172ecfaaf99463249b68350c0e7027534845d4f9566bce1ff77a6635c61c253f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ208402313.
Byrd: Psalmes, Songs, and Sonnets: No. 30, Turn our Captivity, O Lord
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224871df3ce6346f1b400bf5cefe46277b2e073ead1ff71a2464f063926445eb. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRZ208402315.
III. Joseph Is Well Married: Joseph, lieber Joseph mein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50940823b5173983463e549af12f7494635a2fe76257272858736274974668ff. 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/USNO18613408.
III. Joseph Is Well Married: Magnificat quinti toni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e3d2d5ce4740efdb18021ea48aa2bede77cd55dbdab3e83ec49c0d3f191f07. 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/USNO18613409.
IV. The Birth of Jesus: Es ist ein Ros' entsprungen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f249692239fdc0e866a52ed513b97de69e3dbe2fa560dbba20187cea1679b5a. 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/USNO18613412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1119cc4460be1386a46981c856a967b7a90e419a51615259c8eaa079802c96. 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/USNO18613413.
I. Rejoice, Rejoice: Nowell: Dieus vous garde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9cef5b90e692b1ca78ec153e8fdbc0f8001aae002b273b3be2b8036eb5780b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USNO18613401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6fce24e697fd8be49c52dd0696751b274cec73dc75caca66d5c9986ca9bd1c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USNO18613402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0b6e4b106f49e271658be2770c08d44d156702f85b20fdaf73999d0f32d4cc. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USNO18613405.
II. Behold the Handmaiden: Two Fantasies on "Une jeune fillette"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac2b38f0bfd504205333ef27426a490648a61bec323212be88a08482f82b627. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USNO18613406.
III. Joseph Is Well Married: Une jeune fillette / Joseph est bien marie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf976d9441bc9afe2457c11f0f5d34e9c237ab05529d7e83d0f7539ffefa65ae7. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USNO18613407.
VI. The Shepherds at the Cradle: Ungaresca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a08aed75d9a55108e33be6492b56ab35d6f40223f73e5e8aaf286b530e27ab. 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/USNO18613418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eab780f8462ec263a4784944bc477ccc885f45468bab553bb2381f78e8f869c. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USNO18613423.