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 0xfc3f6c33b6bd4811f50dc55e22c376fc60ab585e8959bdde2502cc7157587de3. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e59b3d77-a677-4e13-95b8-562b2b8ad212.json and https://artists.proofprofile.net/proofs/artist/e59b3d77-a677-4e13-95b8-562b2b8ad212.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 0x858b9295f9f1488a1071bf95ec0f73170b6f64ce1d6ff0af51909296433cd1f0. 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/DEYX82183983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92aebbd84a2ff604b32f72aa4ee5be08008ea101804c35eeeaa7e5db90e5bc4a. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DEYX82183985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d4fa6cc446d410b88329311abf691c12bcb2c430c4a391bd01ae43fab5a764. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DEYX82183984.
Francesco Corbetta - Trompette & Sarabande (Baroque Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383a22dbffb2df0f39773b4a7191316894532dfc4dcb3d1a726fda0a657b51cb. 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/CH6542133969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb63cbff45ad03e46b96fb070b1d77e6bfa7af68c3749dcab3208cc7d9f67d8. 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/CH6542133970.
Gaspar Sanz: Canarios - For Baroque Guitar and Colascione
Gaspar Sanz: Canarios (For Baroque Guitar & Colascione)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc155213fb84f635e4ea778ba9f66377e9f6d1bbf1fd76fda47fefb10d145270. 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/CH6542133927.
Gaspar Sanz - Zarabanda - Arr. An: Zarabanda - After Gaspar Sanz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83446f783adf4a0d2c32805c9593297460c33a69fe5fbc06a96c1f76f936243b. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CH6542127860.
Pavanas por la D - Arr. for Baroque Guitar, Lute and Colascione by Andreas Nachtsheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805bd1b852a25ed6fa698af5c94f15f2b460a3c01f601af03eae9e85671e8602. 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/CH6542288190.
Pavanas por la D - Arr. for Baroque Guitar solo by Andreas Nachtsheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e20550e918268a2768f0da30f5163e2d8da965e2b6f49207c27562a77eff911. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CH6542288191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b7c3cefc32f8930fcf6c28da37e1bf0a1e702e2868f75f3de2d84c8218bbe8. 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/DEYX82216188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e02c121a561f0743a261145c80d000974c2983b7bed14f8157939c117c7b05. 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/DEYX82206727.
Robert De Visée - Prelude for 2 Theorbos
Robert De Visée - Prelude, Muzette, Gigue (For 2 Theorbos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260a3a5e3b2bf22f3b0afc7cd9f2fa13b5f31c2ee824add6fdbdfb0f2637214e. 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/CH6542132850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227ecbf05b237bbea8d6329b63c64587a1973956ca6feb6316a8a7d6010ecd01. 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/CH6542132852.
Sonate de camera No. 2 in D Minor: III. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b86070729302db6fadd7bcae1cb29af51003e259269a54f657ead5e5a5fc40. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEB202203905.