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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a49280bdead5ae29196c25971ffbc51a1e8c6bac9c2e68f36b36a45b3621cf2. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0eb793ff-9979-4436-99f0-91ddc341f78f.json and https://artists.proofprofile.net/proofs/artist/0eb793ff-9979-4436-99f0-91ddc341f78f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Quartetto No. 4 in G Major, TWV 43:G3: IV. Divertimento. 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc222cca73fc468fa23b75585023156a96956f13e711496755753d4422f3164df. 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/DEB202042715.
Trio Sonata in C Major, TWV 42:C1: I. Grave - Vivace - II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7de617ec66259090574cb6b5daca2659c6b3de23803696ff52d6a994d9e9456. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB202042724.
Trio Sonata in C Major, TWV 42:C1: V. Corinna. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2259e867573d039481b08c4072240ba0e01ac64cad32da2b41ecc6b5f6290d2a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEB202042727.
Trio Sonata in C Major, TWV 42:C1: VII. Dido. Triste - Disperato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ca45f6314f3c237bdec4ea9d577f397665ddbdfa355cce2f13d1b70a100aa6. 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/DEB202042729.
Quartetto No. 4 in G Major, TWV 43:G3: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee8ba548ef98b85743c2e88c7b8ea9647fbf3fdbc4d4a637b5f40357d24c369. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEB202042712.
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
Quartetto No. 4 in G Major, TWV 43:G3: II. Divertimento. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfabd98f53c8128d11dbe0ce9c6a0b5f77000edacc4a8a407f8dff68e48e4c6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB202042713.
Quartetto No. 4 in G Major, TWV 43:G3: III. Divertimento. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009ad6a23875ad0cecf5f49931b2bf9fa11d28200211f0695850f3a8cf7f92d7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB202042714.
Trio Sonata in C Major, TWV 42:C1: III. Xantippe. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8e05bc44830a63347c9c646dc5505c418c84cdfd55b3ad14cba6c43957113e. 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/DEB202042725.
Trio Sonata in C Major, TWV 42:C1: IV. Lucretia. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ce6148f98a8b4c9a703b97af957716792e751868a661af149fdb29ff6bc8cd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEB202042726.
Trio Sonata in C Major, TWV 42:C1: VI. Clelia. Spirituoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d9732ee4ac8a2be429dae94ba88268545f585d3a11476cbc82408257ddaac5. 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/DEB202042728.