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 0x0246c43f8c1c1a128b3f123c47bd9414c54c87bd40ebed604aeb616c3afaf119. 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/3ab8c068-17bd-44d8-ad66-b19402c76010.json and https://artists.proofprofile.net/proofs/artist/3ab8c068-17bd-44d8-ad66-b19402c76010.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 0x2cd2ffe73843bb1fd051dc9f905487728befe64f3a3087d16e1ec947b271300b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEBL61189279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd318ea1de2c237d2c08b9fa74a1d8b19b455924aa308c503c44c414723d55622. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEBL61189280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7365187fd09d942599a8d699800a0b1646427a5c43f00412f8d23e73fe25281f. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/DEBL61189281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c03e3f972ab074b334b15c5cb1fa5cb3ef6f435f122004437af6f0d5456d771. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DEBL61189283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39506f11eea06420645b9ee2ffbbca1da66349f89f8dcf525bf3cbb0be8e43c4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEBL61189284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c3cfb85fd2e0dfba98d532e5096de48f478dbbfe594a65a2eda19f779d1e8a. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/DEBL61189292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e08bc49a6cd8744d534d9f52f3e86f4f2d21a062521e9df29424e8b152e8b9. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/DEBL61189294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d6f1ffc7d93eb198ae018e6c9c92b734dfb4237e07f5fd2d9018263d20994a. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DEBL61193455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cbdc5a9088165dbbaf3b458c552286d7daab58d6c6255dfd217afc05636389. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DEBL61193460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c76cea50df6e040f08efa535b1269c5f3f6850b576144a371438202d369a83. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/DEBL60799459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadf6431fef76e7521ca2c2e8be41613b3094f9e1e1b4a3df1f55c1f1e70cb52. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/CAI381100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11b700a89884b3dc66346559ec37a12c3b24b4d7de3a19ae9f0147322e98414. 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/CAI381100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2703b4cbf9ac96d9f07b62d2ca15610b8663c7e44d3b36cecbb0a8e587bd6b32. 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/CAI381100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81418bc01f3b859ebb16b74f33734b93e8a86c04a51e7a23ee6b966231002ae1. 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/CAI381100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad21b1b8e0a6f2fa5ec8f74e8160c59c40381069c565bcea5ee6c789b6c7cbf6. 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/CAI381100021.