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 0x1331f492310e00f92795079a655d513b53bc7a3e83c97d407192651580981d9f. 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/7fd948b6-425c-418e-b982-5da612f54720.json and https://artists.proofprofile.net/proofs/artist/7fd948b6-425c-418e-b982-5da612f54720.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xa46ce3cc35b43d82d897f1ae54120d45f1ed8351805c64a62c793526f790ec8a. 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/FR7JM2167010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389d4500af30b4c4347d3d46201217c81df214cdcbe511964811e5ca17b4e824. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/FR7JM2167100.
Fljótavik (Arr. for Violin and String Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341aea37ab5eeb175b7b08471ecbe786f04554c018ec309ca9ed12bcd16ee2a0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2167180.
Stabat Mater (mixed choir and string orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e333ebef35445542e92ed75ac9b0f4ecfa6a3f667cd654efaf1539aa089a17. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR7JM1970070.
Chamber Symphony (Quartet No. 8), Op. 110a: Chamber Symphony (Quartet No. 8), Op. 110a: I. Largo
Shostakovich - Barshai: Chamber Symphonies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50576b7c61be87e10287c6c21fa2d8ed7c0c23741e645e5a77ac05bc5c3d6375. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USHM11463401.
Chamber Symphony (Quartet No. 8), Op. 110a: Chamber Symphony (Quartet No. 8), Op. 110a: II. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cd5c84e0fb212fee09770f23829601cf5d7410e07bfefc8774c986f47877d5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11463402.
Chamber Symphony (Quartet No. 8), Op. 110a: Chamber Symphony (Quartet No. 8), Op. 110a: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621bbfda540eaee08a842aae9612d0379ad84eb35125c65755979dd3b37d43e6. 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/USHM11463403.
Chamber Symphony (Quartet No. 8), Op. 110a: Chamber Symphony (Quartet No. 8), Op. 110a: IV. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec93792cdb09295259e0593837caae569eed13315429eb87fcf05e80f74ba12. 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/USHM11463404.
Chamber Symphony (Quartet No. 8), Op. 110a: Chamber Symphony (Quartet No. 8), Op. 110a: V. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8398f84cf832c03d06b1e42018c2371a5f5c86cd74f250a0b2e4d884a11e71f8. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USHM11463405.
Eine kleine Symphonie (Quartet No. 1), Op. 49a: Eine kleine Symphonie (Quartet No. 1), Op. 49a: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57f68d52a3160e25f127fbc53951baed5c622b1f3f2055a33868b7027d67152. 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/USHM11463406.
Eine kleine Symphonie (Quartet No. 1), Op. 49a: Eine kleine Symphonie (Quartet No. 1), Op. 49a: II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b1db84dfcf3d1a8f9540cabff0683f0b3bd27ae5584778a9434fe4a284505e. 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/USHM11463407.
Eine kleine Symphonie (Quartet No. 1), Op. 49a: Eine kleine Symphonie (Quartet No. 1), Op. 49a: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f68351796405ed4be9b199f5dff35df8cf09a310f4dec215e8893501a51fa3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USHM11463408.
Eine kleine Symphonie (Quartet No. 1), Op. 49a: Eine kleine Symphonie (Quartet No. 1), Op. 49a: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9fefa90e41716493a4c52c81844f1293eea8d1b78e1a33f2d06a595d6acdea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM11463409.
Symphonie für Streicher (Quartet No. 10), Op. 118a: Symphonie für Streicher (Quartet No. 10), Op. 118a: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d8bd568c816599b67b4003259ce419a16aa39de0c49da7d6df0db9e0a3bd5d. 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/USHM11463410.
Symphonie für Streicher (Quartet No. 10), Op. 118a: Symphonie für Streicher (Quartet No. 10), Op. 118a: II. Allegretto furioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0abf55aaa98d58dae1c23514ae15b968c010acf15698281895ed43646bf639. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USHM11463411.
Symphonie für Streicher (Quartet No. 10), Op. 118a: Symphonie für Streicher (Quartet No. 10), Op. 118a: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dee40000227e27262db9aec270eacec93c6643193facba15087802f2aa9e2a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM11463412.