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 0xd5fa234d6c2000dff08216b7780a112c88a97baa824b0e44b154319d4385e5bf. 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/7fb8938a-5474-4326-bbc7-9d342f23ff6d.json and https://artists.proofprofile.net/proofs/artist/7fb8938a-5474-4326-bbc7-9d342f23ff6d.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 0x41c112dd5a95ae2e7545f4c89be279295a17f8c283c1dd1060043db2111d28d5. 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/BC32K2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b7381d3b7e8b1f955e4ec85b125251151a88a1623890b697e4efb5fcfb78a2. 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/QZW9K2304716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df96c6229b261afa16608350b1242fee7c77365e644b441cdc9324da9040a5a. 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/QZW9K2304717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb610361484b6db4fc35f2a181d643f985d474c77696c699df16983313a350e. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T10:03:17Z), 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/QZW9K2304718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe168698fda9cc092ab4ce68aae48828c71c7408150d740c76733af4f977de748. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:11:40Z), 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/QZW9K2304720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41042d35512380b14db301606cca09bbd7a29422a91edcf1b821929836ba4bac. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZW9K2304721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb2b9e63e5ee4e3dec2b1f03faaa4225a7fdee5aed6d380d5298baf00c8866d. 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/QZW9K2304725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7459315560078828700b87e206eea441a6720ece0790c7821bc88873236ad3. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZW9K2304727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce97ccc7aef437da136ce65bbf200f2d51622d6fdbb27d00cb43d01de21c3899. 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/BKLVW2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2d06437bacb35df967e0167dd281acda71e82f77733401b51f9e77f8bb4622. 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/BKLVW2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6555f34e215c7e8e25788811679e784a976814000b79cbf994a65d0413fcf0f9. 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/BKLVW2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac527f3420196a084d27f0e6f263965c86e2de36d1c950a5520645af7987308. 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/BKLVW2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3fb62708f933454e9d1aea34b63b2ed9e73b805a7b0bd2d86ed022f9d76919. 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/BKLVW2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf688478ebb43bece47b25cb00cab4a356944afb60ed4d29d51d5445bc4b3f2b0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKLVW2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf97ab4eaaf2134ba40d6bb74c2359542541b348a45ccbd1bb1e6758fe8c812. 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/BKLVW2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c9575d17c60c35d383634926c674491635299eeae042c4b2aa1a55dccda1fc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BKLVW2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c11d9906dda9410cc038cbc9fd806688658343477fa7089b15511ae0956214. 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/BXIV82163043.