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 0xb26a358a1e575c64fcc038837250d27ce0576244b6d3b1ce40cdd26ba632b2ae. 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/3513d4a7-59d3-4d11-bcce-a13c0b7e25aa.json and https://artists.proofprofile.net/proofs/artist/3513d4a7-59d3-4d11-bcce-a13c0b7e25aa.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 0xf3cb6ecf96c4666955cc700942c18d4273990648ecdeb623e9e2bd6b378b0659. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ZAA169500439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2d3193c3a57442be518ddbdcc2e6cd60b851de235f7a1d0fa910f41c8f057c. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/ZAA169800401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7102aa4155f384017f0b1bf7332eec7239308f9c92ca9251c92c832af9d853ad. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ZAA169900118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330fc6270a5017276074e6105615b37ed8cd05717036a5731d71983ed49d45d3. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/ZAA160300660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8760249b0fe7074acf91954e93c6c1b6fe08a7037cad06c389d306a8b0bb29a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ZAA160300666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ac717db16bfd70ec4ca22fd608cd8fee33e6dab25568e88f365d03e9780eaf. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ZAA160300669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3906df043a8a4a8d6966ef79ac12bfb7b09e7da819edb1af51abdb0282dbcdad. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ZAA160000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842cd8b4ce0a1ce1267a3bc89fa6c819659646ff0b2efc895ada6e2774ea58ef. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/ZAA160500637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df86fe6c42c976ec213d47af5353dfb8b9c4a4915c7b2868d12cb48156008a3. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/ZAA160500646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683c7ad32d011624f6eddc54611ca1213b8536fbf021052575c026dfa73e2748. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ZAA160100576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc74cc4f5b06dc1c3cccaeab2afc2a2661ded84a57e872dd0afe18db399f5f6d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAA160100580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb848eb21c12cb9a9c98775ec0ee6c96f25ad18f3e4117d8681f055da49408cd9. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ZAA160100581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36ed9132bb6434c4ac14e74db420cbdf9a7e2d129b2bbf8a75ec1bdea317188. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ZAA160100583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e86375a29262cc630221907266735f0af5d90132886f9ae7d7edb29c6c11b00. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/ZAA160200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd666e02392c3f74c9a18ce88234111ebcfe0310cb1ebece3ef684b6cdfdbc176. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ZAA160701268.