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 0xbdc6ec947f473422860d084f014a35bb8763003666692760e70ad709349e5051. 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/80e5299c-7367-4b9a-8b82-35ab97067350.json and https://artists.proofprofile.net/proofs/artist/80e5299c-7367-4b9a-8b82-35ab97067350.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 0x4dff8d8f69eafe6567609d8256c85114fd20e7ae2ecb910cd3761c1b4671384e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/IL1001087125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc297fbcc258ae1392af7917bc0c1080953d7065c7a8f6f8ecde1039bd3858fb. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/IL1000003759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0541834e19b5be51b376d55292258590c40f5ae144bd0df01b677458923117a4. 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/IL1000003761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cd8e5c31d183817fc044438db09e9323518512ef3eb11fdcb3c53b77561585. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/IL1001088392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe938731fc2240180f22865878f4c9ed7237deb30e125d18790eb8b7e69d2b299. 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/IL1001088393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3ab16a51fef12e831fbc9208a878cbe786a5fe22ce16bdff7734eaf9aa2f92. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/IL1001088395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc57826691e885c636ecfa75b9d51040398b1a747f09d8a5ca227b6e2349e97. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/IL1000003747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50117d3b2717cdbbb178141845fba2d58125e3ecb5b6ba298ee46735ea0e1ae0. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/IL1000003748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8be46ea3047e1f8cb6c67c0244ad12fbcfe01beb9fb19d78a41c9cd9073a442. 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/IL1000003749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46de2a1b0b533173473912ea2045e03150283d4cd2178e6635e473d023085102. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/IL1000003750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d96934bab62bbd6dd54408957ce45b05d63767fe6bc5f27b3bae61f6b94996f. 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/IL1000003752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2532232a457cf329b12dd73cc089e5f1a79656be1008820212ccbb1ad526d7e0. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/IL1010102393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9e12d7c558e7f68c95db29b8b7b4b967aa9377af3ac8967e5d43df3b658a77. 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/IL1021207128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf977c116bf1022e711da286a141a2f2c74b87abd17bada2ab48525f9596be2d8. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/IL1021207129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3173b10b83237828f5535549c62b01702a00c72dfa50567f1c577759ad76c65d. 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/IL1021207131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8369d720f0c85ccafcd6a60c2d4359df7e56a3556e950ca70b2cbdfc94ebe5. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/IL1021508844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e392337d4695bb72528934c2b7adfb2321fd441001cbce491913f21259392c. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/IL1000003743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e392337d4695bb72528934c2b7adfb2321fd441001cbce491913f21259392c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/IL1000003743.