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 0x6b57f5c4a1e579ce5c2355300afbfa13aad3b4f9f75b47b4287cbe2f72aeb382. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad9c4f39-7933-4221-a4ba-c8841747a91f.json and https://artists.proofprofile.net/proofs/artist/ad9c4f39-7933-4221-a4ba-c8841747a91f.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 0xc35313274af04bf185e7119ecb8913a21852a952f388c330b3244405be9badaf. 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/GBPS81675758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f5b46bcf547c5c2357c7e0797b6267b9baa0c50c606dbf3bd0b2a7b140f397. 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/GBPS81756303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3e37931254863a28e79657e752dab6326776e5124a6ab9173d373bff104de. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBPS81896345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960e99fb84ffe9e04e94c706cb89d51b62b3941d3351666000d853bdc7146e1c. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/GBPS81669440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309119aed4882cb16aa3b79c0a7005a02cf2bc0cd876fa943bc155b6320689c2. 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/GBPS81732400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d42a3738b14bbffa18a28d1b0ef85adb19c89813c2266dae759790441ab0a8. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/GBPS81675760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd80c869958909a937d1b4faf6d68b880b5c94dfa5a9816ee888ed7f455c2ad. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBPS81675763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964d4807c3447c9eaee4d0035b8121d0a3647a2c099927442654c4075dfeb00b. 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/GBPS81669439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fcfa881c3459a274af052b88e3a7fe1da85ec2e1b94b62a29e2ffb21ef64d2. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GBPS81756248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fbfbc477086863386968f3bec8c0cd7703ffaa6aad39170963464c533422df. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBPS81896346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e2fad4e4110613bdb56c2c9ae08fb54c722cfb10be83e2a191bfcf165c99ca. 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/GBPS81732401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb53fe892fc2d1041cb7e119851705146cc84a025f70d8098921a16fc90c0277. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/GBPS81531941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6efa116f19097fc0acc649ddcbb2c675e13206639241c5eb23583d61d0066e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBPS81531959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993aaf699fc9f6b3580bfbc69f725ddfbdec8325a901e1175c05bfed16f7a771. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:49:44Z), 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/GBPS81732399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d7b9e8bc16b954fee34d3dba6a4b929d7a584290e40c5db207dfb2c408b79d. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GBPS81531883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed8d461b2f1c8c2d7b55281011b9d267a72046c29dc325ad11ea76a2e244c24. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBPS81756251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfdaeaf03d78092941e9d807c9b0c74cf86c69c400b1f94b522a3c2fc5cde44. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:43:39Z), 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/GBPS81675762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe710c993fdc5a1b6d103e4ceb66e1325e72e8947c17c82efade75ff2c9c8345f. 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/GBPS81531884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f74ba18b4d8767903be23d1e7bf8f481a1fdbb461b0a775dd213a3da644f99. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GBPS81531881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc771b9e83d5764569c161ea4bd889bfadedfdee20d2c4b20af470eb4ce964cb8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBPS81896403.