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 0x3487922343e74481bd68ef510daf53978f0268b7e98cc2b7ec75a22be8145a73. 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/64098124-e6b4-446a-99f7-8f76bfbb2f43.json and https://artists.proofprofile.net/proofs/artist/64098124-e6b4-446a-99f7-8f76bfbb2f43.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 0x23f1d22f491e334142cb01f3fcae8beaa82a39b700f02d0ff7156e3d233e0582. 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/ES71G2210665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1ff3b89380cf093839e5862b82381e7822f8acba80949d9605496fa80d1455. 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/ES71G1854051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891b4a1abeb344c1b152631f8fa0d0003c6262c3867ca69a0c4aeb263810bc90. 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/QZTPX2111487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0f35840b6853478863ff011d1553fd0399d78df5a092185510b3e8bedd99d6. 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/ES71G2314252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefafb020d9240552a12a66eb620faee5cd706690b6cbd4c85172080fdb028b3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES71G2247638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af1d3e8822dd044e0660da871c1a9feebf293dbfdbded4dc8defe7275cfbd0e. 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/ES71G2219199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3771a1a9c639834da476e14b30cc718594c0c05a51a05ada364668e69486f7ae. 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/QZNJW2461169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c55ab20673dd4a2aacb8b86112db5d6a5ab2784f9466c8242c8debcddcb79ce. 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/QZW9M2289911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c4c97c1188ea935d0d75ae5cae2ce3c732884c893406818c50eab7d5dbea48. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QZ5AB2315186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51426f2927ee5aae486d126ec648f783c847cbdd6f978e641365bc262fc7d04d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZW9N2202628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c55ab20673dd4a2aacb8b86112db5d6a5ab2784f9466c8242c8debcddcb79ce. 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/QZW9M2289911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51426f2927ee5aae486d126ec648f783c847cbdd6f978e641365bc262fc7d04d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZW9N2202628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fe0b655c67dea3f31535829078ef798424193017712d23f997f2e8359fa276. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5AB2196458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6e40b390631d8c0e29504fe6c0e460b1d80d41497fdd6d8f0789e74402605b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZHZ62113955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a649c49df922cf4f09840d4974175679014e308722eb5676afa13691a82b63. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G2215520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17630bdeb165dc5f77c5714f7b0ae3bbe7aa4862ab6245dc876d7ecdc050ca7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMBZ91958799.