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 0x1ae1da1616e2706edd3cf2578f652d26269399a29307c4cd555dc9a7f2495839. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2909364-8ab5-4f64-802b-d4bd7c8e106b.json and https://artists.proofprofile.net/proofs/artist/c2909364-8ab5-4f64-802b-d4bd7c8e106b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Lotte Lehmann – A 125th Birthday Tribute (Live)
Vocal Recital: Gigli, Beniamino - Verdi, G. / Massenet, J. / Puccini, G. / Bizet, G. (Complete Collection of Opera Highlights, Vol. 3) (1930-1941)
Vocal Recital: Gigli, Beniamino - Toselli, E. / Crescenzo, V. De / Donaudy, S. (Archivio Della Romanza Da Salotto Italiana, Vol. 2) (1926-1947)
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 0xb7b42c5a98ad965c218991094faa8a9d31bce2a58b06a5c307f1036e182f1344. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1004758 — a six-check JSON result.
Opera Arias (Baritone): Luca, Giuseppe De - Verdi, G. / Donizetti, G. / Rossini, G. / Mozart, W.A. (The Victor Recordings, Vol. 2) (1916-1927)
Schellack Schätze: Treasures on 78 RPM from Berlin, Europe and the World, Vol. 13 (Remastered 2018)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35e48e331eb43d8dd50151366024acb9c4b740f8ff8d56e7f18c11c4cadbbc8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111801144 — a six-check JSON result.
Vintage Hollywood Classics, Vol. 9: Sonny Boy - The Merry Widow - Gold Diggers of 37 - Broadway Melody of 1936 & 1938 - The Firefly & Others
I've Got the Feelin' You're Foolin' (From "Broadway Melody of 1936")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabb942ad517e7dca97f1056438566e1d026ccd88d26bcbc9abf29e7ee90cfdd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111302626 — a six-check JSON result.
Vintage Hollywood Classics, Vol. 5: Leading Ladies & Partner (Recorded 1928-1940)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb17084e0837883de96c36c31f59d15db0477f914002b8c6934b127747e9826b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111301939 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89444fd271ad914db0d2425232668e3f5af5bd134f9c787ca31e80225647c3c. 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/DEL111301940 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0167d3b13ced3b6abef0057dff6a19f4bcc4af7709948c1381399ca125dc2f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1026711 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e547b5b131b161935b3c8a801f0c7a07349d3303b9073c7c4f9e271a015b570. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1026712 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ada61b864f968966e444dc4613cb232c7822600b5070347a2169f1027bbd6f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1026653 — a six-check JSON result.
Schellack Schätze: Treasures on 78 RPM from Berlin, Europe and the World, Vol. 17
John McCormack: The Gramophone Company Ltd. & Victor Talking Machine Company Recordings
Gigli, Beniamino: Gigli Edition, Vol. 4: Camden and New York Recordings (1926-1927)
Gigli, Beniamino: Gigli Edition, Vol. 2: Milan, Camden and New York Recordings (1919-1922)
Gigli, Beniamino: Gigli Edition, Vol. 7: London, New York and Milan Recordings (1931-1932)
Les pecheurs de perles, Act I: Je crois entendre encore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4ff34024ae8bb2d6316970725c640f7808c22ddfe7f9bc749ad6191240bd94. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190426007 — a six-check JSON result.
Crooks, Richards: Opera Arias / Songs (1925-1945)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105f295638ae414de073375d8140d491632319059a34acddec5f54958f36c205. 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/USASX0855141 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13267f8e80e1b31104992d684cf2761439edaa65055acc005307e0267132000a. 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/USASX0855125 — a six-check JSON result.
Schellack Schätze: Treasures on 78 RPM from Berlin, Europe and the World, Vol. 15 (Remastered 2018)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e6777c3ad5885a305dc1cca272c8e2aac1449029e3de2a3e1a68b1bc13d349. 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/DEL111801281 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a08b6ae7aff058fbc7f614c3a6a49acf94ca17bf9c0990e39c2a18777731ebf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111801289 — a six-check JSON result.
V. Herbert: Vol. 13, Music Through the Night
Nathaniel Shilkret: Around the World, Vol. 4
Gigli, Beniamino: Gigli Edition, Vol. 3: Camden and New York Recordings (1923-1925)
Shilkret, Nathaniel: Skyscrapers Symphonic Jazz (1928-1932)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6f2549995302d1e88f3eb6b8554b9abdd75f4339c0bd6a5bebb7f69a12f85f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190211102 — a six-check JSON result.
Tchaikovsky / Wieniawski: Violin Concertos (Elman) (1929, 1950)
Ballad for Americans (2024 Remastered Version)
Vintage Hollywood Classics, Vol. 13: The Glamour & Glitter Days (Recorded 1929–1946)
Vintage Hollywood Classics, Vol. 11: From The Roaring Twenties to the Swinging Fifties