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 0xbeeef811e5044e44e9094ac3ef6a655a5038c6ca9486d3d275928df20f3027cf. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0db70e9-7ec6-49a4-996f-9a5184cc0251.json and https://artists.proofprofile.net/proofs/artist/e0db70e9-7ec6-49a4-996f-9a5184cc0251.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sonata for Cello and Continuo in E minor, R.40: 2. 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 0x2074fc1252df13a552f3c468007c2cad8810d051724ad263a53f8bf326e6cd73. 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/GBF078710872 — a six-check JSON result.
Sonata for Cello and Continuo in F major, R.41: 2. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ec0749b293b2f71b2724b400941e9cdc2f69d5bd7a79dba5b2497d24850bb5. 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/GBF078710842 — a six-check JSON result.
Sonata for Cello and Continuo in F major, R.41: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1555210a2b740fa7d2a5eb1a74bd7f2aa5acce20c42b2b05ba9a49777ef08fd5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBF078710844 — a six-check JSON result.
Sonata for Cello and Continuo in A minor, R.43: 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915b031946cae5c5cc0656c8eb65f9fe432d025cb66b2e92822af1ee54c675fa. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBF078710851 — a six-check JSON result.
Sonata for Cello and Continuo in A minor, R.43: 2. Allegro poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12d9e62cf92b481814cede59bcc4a0e5b35bb0eda65818e982fab395419c1dc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBF078710852 — a six-check JSON result.
Sonata for Cello and Continuo in E minor, R.40: 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadd5f48da76c23a97be5d5620e3c552a5240f6da6042ed1bf2978cc7eb4495a. 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/GBF078710871 — a six-check JSON result.
Sonata for Cello and Continuo in E minor, R.40: 3. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5978c81b46603453e2ce4ae58dc22be1c7f594893750d468ef565b51fa3025. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBF078710873 — a six-check JSON result.
Sonata for Cello and Continuo in E minor, R.40: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50bdd7df108492fba92acd8c21493128aa01a849a2d88c7c68c2f97bae5f710d. 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/GBF078710874 — a six-check JSON result.
Sonata for Cello and Continuo in F major, R.41: 1. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7101de884c32b892f3d2a50deb10fdd501e2c7ad48c624a97358275871b8f3. 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/GBF078710841 — a six-check JSON result.
Sonata for Cello and Continuo in A minor, R.43: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8c2b894209bb26d54004a4764b44305a2e456d07fc296803f256fced0f1ba9. 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/GBF078710854 — a six-check JSON result.
Cello Sonata in A Minor, RV 44: 2. Allegro poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1e4dd4d010db8032c04ae35605a87fb8cf8314f8aa14e65368dc5283435d03. 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/GBF079043205 — a six-check JSON result.
Cello Sonata in A Minor, RV 44: 3. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67a4d45f7b76bde138b134f541748ec6f9c7a0f104d3b7bd724d2ae2e2669ae. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/GBF079043206 — a six-check JSON result.
Cello Sonata in A Minor, RV 44: 4. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0fc0865fdd2c05f5bb972292927f8a7e1cf89a83553317d15fd57c0c555591. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079043207 — a six-check JSON result.
Cello Sonata in G Minor, RV 42: 4. Gigue. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928a5a33ffef091722d3586dec682f8cea96421f12ef609437210ae41fb2fc95. 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/GBF079043218 — a six-check JSON result.