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 0x0bab556dfa046715d6bc90f48a1a9a68b4a58e7b5afc1431d6c34a87c317289f. 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/b5028ca4-e082-4630-a2d1-3bca1efa6609.json and https://artists.proofprofile.net/proofs/artist/b5028ca4-e082-4630-a2d1-3bca1efa6609.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 0xd1c05c56faa07f50ecea153488b11a7d42054605cb18b2dcad841e89c4bca15c. 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/CH6541810890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009c9eabc8dff2431665f245dca902a9f43f978891069af1bd3434332f2501ec. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH6541810891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785ccec40c1ea4f465b92976da0685a3cab01107cfd6f794f5671331c8a9f3dc. 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/CH6541810892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5506c313add0611f92c5eb28660d306f92c131808e6817bf97ed0beda7a4030. 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/CH6541810893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60680a6171b36cb0d0255a9729f6d328218a00f55c5948ed04603f4a876af63f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH6541810894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26dbf627ff7b22a53afebf2625357889e7d53c0fab58d5c1f5f2603ae66a559a. 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/CH6541810895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c5aec2a6d5d59e32d4e8cc2fff3d59b3b72e8f08d29827be65b41c011aece5. 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/CH6541810896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516a955431579774ff282d8b38f73005f1d4d0ff34ea906a686e82f5930df53d. 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/CH6541810897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31445297cecd004805ddf1d7cf8d0eda791327657fae1168f44903abc081eaa2. 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/CH6541810898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44acdeb6bcc0896aa44f788754c299d5a3dd312141c4c2de2eb061ab3cc569c8. 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/CH6541810899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8304c16cc3bb7227f2d828900c4670ad6ee8c50eeaa1582cc81ecb0d46c215. 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/CH6541810900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2df340102ecf237a66d99902b569d3a5a360aea4315f5398190955bf0ce4c2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CH6541622365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30ef84457fcece01ceca6fa39f47599b0f5d4a6461940d49c261127fcd6fb1f. 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/CH6541622369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f4230dc6d07df9d1cba80f1fbb56c669b2f4c350e99ecb78dc61df74a968bf. 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/CH6541622370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137c35a6f1410028dc7a379bf13f2b0943136c4d82c70e5bf3767bcf310668e4. 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/CH6541622372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfc5ec929c4ad439e319614809fc74912bcc07d32dcef9a06132cd138308606. 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/CH6541622373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4835168204eb6e317ed7a93d8ae7d706cb18710a92e40146793c41af289da21d. 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/CH6541878399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4956c40afd19ce3df5ee785fbca6948ec645d00cf275411e4f751f6470bbf6be. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CH6541620860.