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 0x396c80cdddf0d281823ed60fdffde8864c1ee84b20454bfda9b6ccfc8ea93d70. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c06d942-da2a-487e-a541-eb495baa9967.json and https://artists.proofprofile.net/proofs/artist/1c06d942-da2a-487e-a541-eb495baa9967.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 0x9b22b48d46b1cb1a3e2c798a32e9eaf31a42b05a3aacab5b95769a40290081ed. 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/QZMEM2047224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53afc66da3bcd29ce8cf563dc610c22291e244faf2c10de6886910f569285e8b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZMER2002861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aba51894275a3cced5470080151dcc2172996d6cf823a5132d7f76201835a93. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN52052690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b52d321671735e8d5b45ac07e181247b1308f9ede88964df720fe9c226988f. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZWFJ2596266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1bf847e96b095278f16eed63541d95ead9b534a4c79befd41bf4c049401b98. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHN82077382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8c77aa118cc4c610c9007e4b959e0e8d84b7f0d86884b013605fc130c5eabd. 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/QZHN32081147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1bf847e96b095278f16eed63541d95ead9b534a4c79befd41bf4c049401b98. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZHN82077382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911e17e34bf01b41fb64302b52f57ec98a04841b8108fe847d1d081e9fac5453. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZNWY2039863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911e17e34bf01b41fb64302b52f57ec98a04841b8108fe847d1d081e9fac5453. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZNWY2039863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3f84093ddb7a6ef9993ad5cf8a1f9f6c33afddc4588c06fbd931f506f18708. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES52172048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ce70e2cf54c7e89f066bcb22c0e6cf27643e1a634218f83c976fa651b70138. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFE2573790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd971a489fe7792dc5f0f386cdbe14ad9a7ce311a03db599d3fb02d247006fdb. 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/QZFZ62185941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd282ffa7c57c3f2b22cec087349bff4eb1762823d54722290fa847ebf9170950. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZFZ62185943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3915ac9cacd13eb5dbbe3d2c35ac97f1ebbc65b9a6e46242d610f5fd4414e087. 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/QZMEM2053968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3f84093ddb7a6ef9993ad5cf8a1f9f6c33afddc4588c06fbd931f506f18708. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZES52172048.