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 0xfc37b1a00b065e4b21806ff4d8f82cf2a9e31741ab6a57085e579ec6b9542342. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c709176-09ea-476a-bfe1-7c53cec8ca46.json and https://artists.proofprofile.net/proofs/artist/9c709176-09ea-476a-bfe1-7c53cec8ca46.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sinfonia in B-Flat Major, K. 353: I. Sinfonia. Allegro assai - Grave - Allegro - Adagio
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 0xe3cd6e77aa556c180fccf3b9d490144d356cceb20b29c1805725330d9f80f0b5. 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/DEB201598001.
Sinfonia in B-Flat Major, K. 353: II. Libertein. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7945068bfa3d7cf22787403e1d34140e228f71b9f7850cc0c1af62135c235042. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEB201598002.
Sinfonia in B-Flat Major, K. 353: III. Entrée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eff79804b90bf08f2accc91f0a1bffc156b880dbd99870e278f476af5bf732. 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/DEB201598003.
Sinfonia in B-Flat Major, K. 353: IV. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20dbd6e96816cd327b416db34e6a2493f6ae3b47cab409a4ef2f8164a34fd01. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEB201598004.
Sinfonia in B-Flat Major, K. 353: V. Passepied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8eed70f6e2d08e2105b991eae709e7e4ce9681ea78f5d31b3a0ef51f7eabbbe. 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/DEB201598005.
Sinfonia in B-Flat Major, K. 353: VI. Ciacona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4770301d0daada03b891a19cecac28b4df46855ad82d587ab9c17cdf4cc2d5. 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/DEB201598006.
Ouverture in F Major, K. 354: I. Ouverture. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea98bcb83f1bc5a5cc44f12013e409915f2b5d4669e46e9f905197ae6767e2d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB201598007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3182912fb7f08aad790502d86a946764d2c79623794c2bbaef1f4c63644f773. 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/DEB201598008.
Ouverture in F Major, K. 354: III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709bd8a12b939a7d9b0e09f9ff816f174d61c1245c552c7b043edf23da641369. 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/DEB201598009.
Ouverture in F Major, K. 354: IV. Follie. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb601b8f1cffb545c4f2d703132317f6c08f5be9dc91ddd2b5fba1463d10d14c5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEB201598010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c12af85859505f59bf63928ebef5307465b890b28cf284616f28b69c452fe8. 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/DEB201598011.
Ouverture in F Major, K. 354: VI. Guique. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191453e162b00779fb22c77c53681125caab99e7bab52bd0bb6b133cd18e80dc. 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/DEB201598012.
Ouverture in G Minor, K. 355: I. Ouverture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4c3c6daa1c1d7818b517e7fd3a4ddb35bebfac34f88fa8f96fd6b7cf244e82. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEB201598013.
Ouverture in G Minor, K. 355: II. Rigadon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9f7a0919df4bb092361a77a3926a2d8ba41800da27b68d09a7f2d8058190df. 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/DEB201598014.
Ouverture in G Minor, K. 355: VI. Passacaille
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b403658b3065d04154d92ff7f30179252c2b53deb4a6ea91de843e224537d98. 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/DEB201598018.