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 0xc4a348738acccbd0c89d0db18f88e7f7c8f04e6164c1c501e90c08dc57035760. 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/6c90f09b-7ba4-4e46-8b98-6d726f8d8eca.json and https://artists.proofprofile.net/proofs/artist/6c90f09b-7ba4-4e46-8b98-6d726f8d8eca.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 0x2e42338d4be4ff20e9409985d9919e16846b9f6c38955f7b991057b8dd68771b. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/USJ3V1087784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc685cdb61f4452b686080147fd2f2fecec7b6674c1a6da24b0940ba718eb1fc1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USJ3V1111558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a68618a9f8d06688ed6937aca9016683c5deb12eb39e6270038b06622321938. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/USJ3V1111564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4b83a4bc769085dc3061114e9af6d2df826b41c2d28a71310f199f6ceaa51b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USJ3V1147112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63670429df8b3c0e8e226a128cd01b481ab274608518acc959535d809f5aeacf. 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/USJ3V1099532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957caca875335e2993c82e2972fd68954594b0cebddd52a0c39daad795d821f0. 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/USJ3V1111234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ad2c88a1322c41a60900aa006a74fa9399783d9e9923509caa5f45d5afe2a. 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/USJ3V1111244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebc78e72d5879d3051e80597decfe34a16110cffcf83e6bf1554e8d2c214761. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USJ3V1111246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6299fb3e53d954fa9c2c504932074e7a4478878ea6e1c4b7b7d3b3625b654f76. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USJ3V1151733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56709dd9d1e2b7c6513366c33f07a6ee33858524e38a8f69bb0975c4c0be0b6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USJ3V1151737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa307bf23b128d0c37efc415b23063c9bf1f85c471dd981a041846e1fb9f7c740. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCABL1353864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7a8051482e05e4deee45bc02bad986bea440dde823aed46a6802e8e5da56a9. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/TCABL1353883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241be339615dd758f7128c53f489f88a70f6d55ffc689fdf1b18013d1f4cca84. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCABL1353884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c20efc17b7e82aa08fa16fce28688ad6afa0348468e5f9017b56c1e036b06be. 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/TCABL1353889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2cc848c98406b669fbfcdc59cde667533fb6b8406f05b69964908734db260d. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/TCADA1799214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31036290716b47d36d9de6487fc2b0bcc76acd56c7934750627be9f53b1b60ea. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/TCABY1468545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241cf8424640358d8a05b19a67390fdab610a245fa62ea7c38fa1fb7de6deb4a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCABY1468579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f5cd290075ad8b041f20314e8d534464a547a281b90166b2ebd45c9280af44. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCACO1615159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5356f50f732c1fb28e28ef8be691d95ce5ea9f6ecd39ad59c9895744e11b40. 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/TCACO1615167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d35626d9828a18bf389f0b7049c06a0469ee7923aff235af77c27d2a0729ed5. 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/TCACN1649389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7cce5ad72aa71bb315b7bf6e4d8895f6a50b7392105f11441b235ed402c0455. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCADE1700712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d64e2bb6ee581d1760cedd757d682b0e03683b033e9fe6748d7af15f5e564dd. 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/TCADE1700726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbefd6e063e6c27aa04e8a8e55a91a3fb76b650dc6c0c271cdef48474e725bf63. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCADE1700733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d67d9f53d1184df31031e47aee22b30a4316653191e91ba49f2c8811b41951. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADE1700854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6426c5704c0d291c66a4bf9bae89cca8cf2ed30b6c2004f5ec6113da0f8a04. 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/TCACR1628012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9277b0e8263a2d8f253ffe3f02e685c04fb65ede03238d620d712155b48ce6. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCAIM2439730.