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 0x03d35abb0d6cc5bddf2bb4d2baf35169be38bb02e704520266131cc630ec8c55. 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/a4e3fdc2-7663-49b4-8dfc-833dccfb41d3.json and https://artists.proofprofile.net/proofs/artist/a4e3fdc2-7663-49b4-8dfc-833dccfb41d3.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 0x5cd44728afc79a1e4a5def93b89642f3aa2cfd19f5dbe90108ba22b44ff34770. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBJX32005116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bebf846cb839d720fd18ea4e5a942c6de5c60fe01ad9707849f57327809833. 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/GBJX32005117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b05a09be9c2bb53ef25334b642561f7d556e20c889a580086fa0a60384e61c1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZAKB2204400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4928ab9d10d56d636e28a08b154a39aa65225bb9d6f52b2ec993515f6afa2cdf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BX1GV2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbec00987fe5dc98b4d25dd344662816b6572b901d9704751b5d12b370fe0f0. 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/USNRS2443342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f9d30d9ffdb119bb4c26ebd2d8737530bfa90bb24762a243e74f2f17466e7b. 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/QZS7J2345804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95b6be6923dd203e4bf1ccdbad6380b675b32bf75ca925be45391c317606d53. 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/NL5WB2300145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7818090f1de5939d732ff788415b3c6d3eef29bfbddfb8c7aca32d5626ee7e3b. 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/QZUCN2200717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43d395251241072a692f4896f6140a27fc45f5c53a8fde8a945c5d461965f03. 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/QZAKB2334371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177b55d4a12718bc590d2c5830a5df565549d6d58e81b22db9cff74f57ab5e86. 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/QZES72355411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3377070c6d47583f13e5a87e4ca4d554478900406039648de0a5b1982e7263d2. 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/QZAKB2168388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dec0cdbcb92e66237f072c55d66e2427f3621e68a60edca268b95e3434b4ada. 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/QZAKB2165995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bdaf93c2fc31b6ed0e587ccaec122e4ab1bec990e4a22615b1e4cd8104fe5d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZAKB2006425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090ecb51434467c5d941f85987ae9fc6d325254c3d5137e278b99e63bd8cf7a7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUM71900672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fa8eb09725878b973b8e790dccb8f0a8761fbf61f495b28829767dfb383bb5. 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/USUM71813500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426eab44165573b2a2d3ec36dd96e1e9982ec49d64cc5d70aff92230891a3685. 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/ROWWA2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7802bc205ea8fad8c3787e1ada0694231724d30644b26596858ff9b5652e0bd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL8RL2420667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de6b2df98f1143d3fdde6b7c9025cedb4f28aa261b757c5c348e7b420d3a82f. 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/NL8RL2336632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eac05f1fb1371bf293f13c70a9f1b0e4640f9b8332679e1f9c9cb691cf35e87. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL8RL2333441.