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 0x478c722ced20b663c748424ad85c5c6dedaff7b925c6d83125b952629a5ce3ad. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d63204fa-266b-4268-b3a8-f24d7dfe5bc8.json and https://artists.proofprofile.net/proofs/artist/d63204fa-266b-4268-b3a8-f24d7dfe5bc8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Einem: Piano Concerto - Blacher: Thirteen Ways of Looking at a Blackbird - Egk: Quattro Canzoni
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 0x77c07505b0e6f0a5f690ad4e8a1d714d5f086a338b9f2f66e1d6fb09f654a2c5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEL112300728.
Verdi Versus Wagner: Great Choral Scenes
Weber: Piano Sonata No. 1 in C Major: Liszt: Piano Concerto No. 1 in E Flat Major
Aram Khatchaturian: Masquerade Suite / Gayaneh / Mily Alexejewitsch Balakirew: King Lear (Guhl, Stein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5324dbabfecaba78ddcbed5f7897281d3c930d78dc06bfbe7bbe67c57b9470. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380011928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed74e8359f4645c787be17ccba15132fb9df55b112c72976992e13b9399d125a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DES380011930.
Beethoven: Symphony No. 3 - Fidelio Overture - Egmont Overture
EISLER, H.: Choral Music (Berlin Singakademie, Leipzig Radio Chorus)
3 Mannerchore, Op. 10: No. 1. Tendenz: Sangesspruch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659a0aad1ba2a0c8e8992c61ff90a0ff7959ec577fbcb167723e99a1177a9f92. 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/DES380010627.
4 Stucke (4 Pieces), Op. 13: No. 1. Vorspruch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f3ef4540898fe44dec2a56f38c66c450abf67be7fdb0d69e26e788e8a68c2a. 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/DES380010630.
Auf den Strassen zu singen, Op. 15: Auf den Strassen zu singen, Op. 15
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1372d376e8404d2e25b561259365632f989afa2f213bba93b55150895f31ef. 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/DES380010636.
Sklave, wer wird dich befreien: Sklave, wer wird dich befreien
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02ef3a362492823a855c821dbcb9430b2401a88e8d7943a6d46fa27de17b26e. 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/DES380010646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fb4f9e042854c669d6684a80fd40407aa89693be7a1f5ae2ead88121281c64. 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/DES380010647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d71a31534ba778957c9771624dad7542f0d6b0e2d81d313bd23f0bb87b93677. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DES380010648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa8eb576972f7eae1443e240eab0862a0837d0ccaa28d66126965c568c6357c. 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/DES380010649.
Das Einheitsfrontlied: Das Einheitsfrontlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a9d62cfbe19490169d1e7b9d5e8abfd30887cc36bed67b7ff51c77e0f4ec90. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DES380010650.
Schubert: Symphony No.9 / Rosamunde Ballet Music
Le postillon de Lonjumeau: Freunde, vernehmet die Geschichte (Live)