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 0x406b5af83923037f01599cb766e5d4eb6f85b8840c74bd27ff533b40cdbd0ebc. 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/7422bd23-ed3c-4c19-aaba-ed66e83aceb7.json and https://artists.proofprofile.net/proofs/artist/7422bd23-ed3c-4c19-aaba-ed66e83aceb7.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 0x3ab483522b1520cffea9d343d99800705cb30d105c344e9284c02621d0b1a1a9. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/US7NV1700175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b538018a72e6abfdd4dd1d17bc2dd9639502039a05d4453e1cf3046f0194352. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/US7NV1700176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e7e7ad75feb4cdbb11b73f2bbaca74b1a754d14208e6751ee5394fcb8f4ee0. 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/US7NV1700177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe698f1491876436b59d14c8a34eff40f7a81f05c9facbf451a23f308d692fb4. 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/US7NV1700178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7fb907223317c8b348e1ca59c78e7b35b197b15f58b64eeff5dcb5b6dba648. 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/US7NV1700179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb7ee1ca1e911445135abf9112ba50929a3b44891541831b640a8235631021f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US7NV1700183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc271a1a298542133b57116d828eb4be07663081a9ab53f807fe5fb175d4032a8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEA1983159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f506214774673b6072f7a8ddad631d4c3780f21f6ee0785c4e0050b1651248a. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QM6N21945595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc9c58523b5d29bcd8278390304fb350beba15214e1861cbcf0b9062ddebf0d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM6N21945600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a94e6da135ce737de0caa02712b51ec2e08961a8002e9f2dfe4224d0a4cc9f2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM4TW2040689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303269226e2d875073a8381fcea9fb03fac10dab9258562eb075ea826d76be53. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAFG2032305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f03d89f9e610a3d0913ef71b2fff8cce7f3ce0b76c8a67d8a20aafa8e5c08e1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QM4TX2291294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a94e6da135ce737de0caa02712b51ec2e08961a8002e9f2dfe4224d0a4cc9f2. 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/QM4TW2040689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f44cb6d5ca26baf07d165ecbd0c92635a901f78b86856c7964a46d35c4c244. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QMBZ92034069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ccd3e95528e36af24df0a85fbe0f3b8c0aa1d35b7cd640fdbac9bcd4f7911e. 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/QZTV32351777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b4869a2423e5def1a7da169ea434ec060f52dff6f0340020040cbd8c096826. 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/QZWV32342990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ccd3e95528e36af24df0a85fbe0f3b8c0aa1d35b7cd640fdbac9bcd4f7911e. 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/QZTV32351777.