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 0x965f4b0596809b098fed68f656f3f18eb4910930a975a53f3b7f66471b83ca08. 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/0db7672e-d44b-485b-89c4-399b580362d4.json and https://artists.proofprofile.net/proofs/artist/0db7672e-d44b-485b-89c4-399b580362d4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Siv Wennberg: A Great Primadonna, Vol. 4 "Arias, Duettes and Scenes"
A NRK Tribute to Erling Blöndal Bengtsson
Concerto for Double Bass and Orchestra: I. Allegro
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 0x9ce0051d1448b6291e3a49cce5d84772dfe8581bdc1f8299159ec86d3433fac7. 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/USZC71124801 — a six-check JSON result.
Concerto for Double Bass and Orchestra: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d300b5d527189a21acdabca94ba32f53ad3dca662709fcca7ce47f1c17b6760. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZC71124802 — a six-check JSON result.
Concerto for Double Bass and Orchestra: III. Tempo 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc921d78b4bfe7af58f34be032c58ae293d0366ca13764a837dd64b945f5ec. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZC71124803 — a six-check JSON result.
Concerto for String Quartet, Wind Instruments and Percussion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70f1166ee179b31b3321f913b1f1d9f740dc2b6182c947dc43cf9a96178151b. 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/USZC71124804 — a six-check JSON result.
Egge: Concerto For Cello And Orchestra, Symphony No. 2, Symphony No. 4
Tchaikovsky: 1812 Overture in E-Flat Major, Op. 49 (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14721ebd5130acde9fb8e946239008d5c785aef11eac06cd466e5de36a6a6be. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8701825 — a six-check JSON result.
Dvořák: Symphony No. 9 in E Minor, Op. 95, B. 178 "From the New World": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e790034b8c61be004c47fd903e93beb1ef891147bf18358750a1de307997135. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAYC8800875 — a six-check JSON result.
Tchaikovsky: Romeo and Juliet, Fantasy Overture (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecced2d0c629f3036a5f621f1e812af94931f8c56f23b656422a624c7b81ea7c. 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/GBAYC8700940 — a six-check JSON result.
Largo aus der "Neuen Welt" / 9. Sinfonie
Klassik 100 Meisterwerke: Klassik die man gehört haben muss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeed8ff460ca4a37f2068f6da9b68d707fdc96208486ebf609c45d8322988ffe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8800065 — a six-check JSON result.
Symphony No. 9 in E Minor, Op. 95 'From the New World': II. Largo (opening)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e790034b8c61be004c47fd903e93beb1ef891147bf18358750a1de307997135. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC8800875 — a six-check JSON result.
Wagner: Die Walküre, Act 3: Ride of the Valkyries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ca4b4b90afad497e064ed934a362c752ac798717893d45381ddc7335cdd32. 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/GBAYC9100962 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6f5df89f991763cf5d8b15d80730353c9a4de47e359793cd6ecd750d415687. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBAYC8905903 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57dea538e891b2406f5ded36ddfcfb9045342b272d0d3007298d1508d140ffd. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBAYC9700498 — a six-check JSON result.
Tchaikovsky: 1812 Overture in E-Flat Major, Op. 49
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b735b9081a3f9fb0852954c9921c1b2dd4d4eee2f9a5320500e1d74b51fe8d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBAYC0001588 — a six-check JSON result.
Mussorgsky / Orch. Ravel: Pictures at an Exhibition, M. A 24: V. Ballet of the Unhatched Chicks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8351b345593f212f054aed7f9d19b785872fdb56975404b54443443ee6ad27e2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBAYC8800867 — a six-check JSON result.
The Classic Experience - 135 of the greatest classical tracks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14721ebd5130acde9fb8e946239008d5c785aef11eac06cd466e5de36a6a6be. 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/GBAYC8701825 — a six-check JSON result.
Die Walküre, WWV. 86B, Act III: Ride of the Valkyries
Peer Gynt, Op. 23: Acti IV, 16, Anitra's Dance
Ich mag keine Klassik, aber das gefällt mir! Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdfaa708b93f33730ff1c0cbac46f860fadd6d987af5df6ee5c40c3cb7a32ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18700347 — a six-check JSON result.