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 0x4c14a87db6b654cafbd488680e55be2387385b50cad352220814f760ff36d482. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67963cb6-312b-4d86-ab1a-81ee9b2a9e8d.json and https://artists.proofprofile.net/proofs/artist/67963cb6-312b-4d86-ab1a-81ee9b2a9e8d.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 0x757b8ec23884e799476748ea949c05da6814cd31f3f874158af7084dad776540. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BRVWS2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff86326f9f49c0d467ae6171419768e9a6e5b5a52ba176b0c208edfc017fa93e. 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/BRVWS2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e57702450b9a4f7e93e80a9317179280675dfeb0879961c5b07f3307c4b2da. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BRVWS2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbafa31a0c8d9b20db7d23e399285778ab8643b5270183a01cca807e06219442. 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/BC0562100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b7d3ddef2bc1897ef58ebb700a755ce14f2264692cad1ec77135290ca3a84d. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BCN1R2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd1376c44ea534ed30508bd1baa9c96877aa54e28a79e8ea3fc58874baca435. 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/BCN1R2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94131ebe5ecd3e861d4c1420dcd60f02b6485589361f71d80f95521d63e369c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BCN1R2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3163e0425f72c06c31001781201559086fde2eba5adb261b3179d9680d77b5. 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/BCN1R2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01c463a08e25ba6b411a85d5a55f984d448c1aabb9b6e6a2960fc0e4ba8d81d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BCN1R2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66268fb3f9841b7a3570da3d3ecf91db2348c92da25eacbe140789689115f394. 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/BCN1R2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfa0235e1764912eb7d221d543e43c95e17236a87247ce83ef208993dff8635. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/AEA3A2596359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66268fb3f9841b7a3570da3d3ecf91db2348c92da25eacbe140789689115f394. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BCN1R2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e9336f5b4dfb1dbc4f118f3dc237a3ece45673718f654e667d30a0fdf61fe9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BXRT62300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb565edf518e4096f2c718816185d04caef351ac8581c6ca4c7fa3c1196a2801e. 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/QZTPX2316527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eaec5cc2e138ff7e70c3ebd0447d85da02474b2586c6aaccced1016e690324. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZGLS2366844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4829dce37b2f9adaeab6cb5d768cd32b2da501f848b629f0b155d4b33143179. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJZ2122784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb789a3922c18342374caead85057abb616086097e3b0743dd9dea1c89919e195. 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/BCHIP2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53740776ab30cfd5ca61ca6314d95fd66df8afacc3707aac8a5d4a88918fd0b5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZGLS2042249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c350f454f183fc0beb0b45ea76e18123d83bace3bfd9a7968fd8f26cbef19d. 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/QZ5AB2097427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23863ddf12dc86865d19ceb5319cde87734720982dc47cddf0fa1fde262c2292. 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/US7VG1995725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ddbff8744cf1b5707705431aa3d1d83592911bebb29c8f5d83f6493db64df3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZGLS1977699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49955c1f1be701f232cb0abb3945ff0c8f5be1c741c08d460b8fc0bc5f5dab17. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZ5AB1969495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b72dd5d6b95cf85296cb8fe382ae720e12155cacf2ca1d18190b8a5bbf3811. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHZ51938223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a65a5e6323b0f218368eab1e906b8219121c1d8c0846c87a7ad8b370bcb1cf1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCHIP2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c03c0023d8c23d48f0d94152d19f5d843f075f9fea6d779da82c677deb86cde. 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/BCHIP2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9934fdd35629b422cf1b617941b89858d0e1fd39311f5c2dc006158dc8a1eb31. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BCHIP2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d86a655824988d7783aebb704f7f544b00fcaab8d1607ea22e2901ffdcc1a7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHZ41950398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0f2913143190935214b8e44f3023bc5dfc61aee6b67b56fd50366d1a76de22. 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/BCHIP2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe581eb9f8882348b385c64da2675985bdf83a33770afcfcd19d5a932bdeb4dea. 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/US7VG1971172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fd0db9ab5ed32bd2dc75bd1847c427c1952fe3801a0e09d86400519a38c614. 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/QZHZ51954928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d59ec8ae1eef1b08dd02ccc9292624bfecd550e9775fd5d6cb976391defd801. 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/BCHIP2100035.