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 0x140ce3f1a3c8228a82bd5fca65f424358d078ba034b3adb5eb8811a3bc7778fd. 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/0f0ad7be-210f-464f-9625-eec202a93c03.json and https://artists.proofprofile.net/proofs/artist/0f0ad7be-210f-464f-9625-eec202a93c03.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 0x83027ff5136bc3afbb60a6a3faefc17e819a42a211d01abf3f62f80f4418e1dd. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/NLSB72400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1346db0e0389eb2f3309584bef10f3d0b7578f02e23c4bacb3679c6f2e1ec37. 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/NLSB72400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd69f38877d60f37fbd6a19bb3252fcd8734fa0e1a52a98c311b90d51f31fab. 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/NLSB72400285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1e51ffb8f76cfeca3ecc2fe218c2eac3b4a070a11a3b947a2604dc1cbbf646. 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/NLSB72400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd69f38877d60f37fbd6a19bb3252fcd8734fa0e1a52a98c311b90d51f31fab. 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/NLSB72400285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055b4e03a94ff3a9ec4bc5878b5b6a48ddc1c8d634bbd7717b13eb477109a17a. 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/NLSB72400334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f34864aab104574fff209e0c54143603f81b98d39293d8c10896317ecef62a8. 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/NLSB72400339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4a8a7b50d55a66b9363ca62e9318ee9f07f9f8a8c6e444e5b738659d9cc952. 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/NLSB72400360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41033d4783ef24ad525eabf47c8dcd734a0774caff8d1ab4fd0b9f25c34732f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/NLSB72400367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6c1d51ca2e0223aa7c9330e0277ac92fdeb5b83880a180bfecec643d0b60e8. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NLSB72400384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055b4e03a94ff3a9ec4bc5878b5b6a48ddc1c8d634bbd7717b13eb477109a17a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLSB72400334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f34864aab104574fff209e0c54143603f81b98d39293d8c10896317ecef62a8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLSB72400339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41033d4783ef24ad525eabf47c8dcd734a0774caff8d1ab4fd0b9f25c34732f. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLSB72400367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6c1d51ca2e0223aa7c9330e0277ac92fdeb5b83880a180bfecec643d0b60e8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NLSB72400384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47127bfe055fdfa591db1124f0d505405fa6df345a02defb232dcdfb8e1a4f18. 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/NLSB72300154.