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 0x5640eda22f0452672f6ee760051811c7e49fac84add7a3b8a58b3fb4a0014106. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf057d23-4081-46a4-b1eb-a0e5bea8764f.json and https://artists.proofprofile.net/proofs/artist/bf057d23-4081-46a4-b1eb-a0e5bea8764f.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 0xa788866f6084776c5ce01e6ae6ca7bc09de18c6d3572262709e8be6c65d92b7e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEY472471226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600e3f5764ea99ccadbe02bd0cf64f35c79c73070a95d55ca8b8cf6cc6374b99. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEY472471227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb16e121c18e7bbb86975502cb4cf3b5e9e4f5227141c08e58d66da4c5fb0da8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEY472471228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3916265d04dc1e995ad451bdd5937077226864840fb3ae73f965639a0ef35207. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEY472471229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc8f1e5929ed0772625ae50f28147000c445f30ec8d3827dd5e3c6f3c112873. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEY472471230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caa64c22a675845ef42f3131cce15e0485bb42b50ad7e47dbf1ba2783df8aec. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEY472471231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93b5b7a24f7d24cd05499904bbcbf209408d7abf46f3f748bc2cb645ca3c913. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEY472471232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3962a3bfcf3ff71a018ee56b86b25475c8665f6b2585e7e2e55df76eaf4525a. 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/DEY472471233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8373f0ace4507f0076d32363ad98d14867127a83f8f6825a112b670aa09c01. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEY472471234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fedc941a870b2c9cef5dd8e41f6df2ac446476e0cd52cff2deb48cc22481453. 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/DEY472471235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8b93c88f70a2ebede239e471b2df49536403f8c4232bbd78a997de3076fbc1. 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/ZAG8M2401183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8373f0ace4507f0076d32363ad98d14867127a83f8f6825a112b670aa09c01. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEY472471234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb16e121c18e7bbb86975502cb4cf3b5e9e4f5227141c08e58d66da4c5fb0da8. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/DEY472471228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16908cb61f2fabfdcd557786a8271ab401f5e73b85433855553848ae9ccdae95. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBKQU2408786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ae812ec04fe97ff790401d2d108334637f312f6c54037f0300be8fe20f05cf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU2408787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b15570b1ba9c20706337512a4a8e09176f25b341b81c41c129d820a98e766e. 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/GBKQU2408788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856bb5a00479d34515a3e68992342f02fbaee61c9e4b9feb4be6b2bb0642c420. 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/DEY472471120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde20b5ac0f8daba2bca24b17497d4275bf9bbebcfa3e9b96b17b913f8b341a7d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ62422152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8736111e929a2c7b6a9e9994086f472bbb8712cc25680f8252b575977f6a9ad9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ZAG8M2301097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43abb67c19ce43526ee65fccaf59ee40a18888832c753a977d5101f0e2699ba8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEY472376792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813433feb8503851cbc707452fac54fddb426043616eaab5ad0c89309089525f. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/ZB9YU2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8e561d7875492197930524480ee789618d3a5c89032c50ccb2b0c5a48c2346. 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/CA5KR2337201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d4aa17627653b516b48df0a10d72ddd488e78769a9e7e9c5e181446e787491. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/CA5KR2324625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcf5f79d0fc47d6fc7a95612cda50a0d904e9875b6397ccccff8325ae2fb0e9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CA5KR2324626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdca8fb09237077a188cc2e601542723d52d9f0e41e9ab755f3e0983ce983bdd. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ZAG8M2200992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934e2aab0272cb995ae2f8f704ce150ca7019747de55304ec53abc15a1208a95. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/CA5KR2221794.