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 0xf471ff5d1d923c762f2a19fd575b5d85034981923f30363ff27c35495765bd22. 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/6666e14f-cc1d-4d41-b768-72d7d68b3490.json and https://artists.proofprofile.net/proofs/artist/6666e14f-cc1d-4d41-b768-72d7d68b3490.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 0x331bf7e3fb426dbf4b26bc8ecead1803a93472e92acd565f935c5c5ebb28adcb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US7VG1956475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739fa342c4694fba8aacde072840187ff6a73453fd5efd1d82f74668794da4ce. 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/BXW4W1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7f4af11824e4c265078e6ae9d892a016c7148bcc3fb307eb479d8171a81f7c. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/BXX8F2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59e437a19c57adb8d5951de0b5497c926e384ab51d8f6c4eb5f2567e252cc7e. 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/BXX8F2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28143e42276fc27d73afe18222ce0098dedc46d4303177ccb9dfd40b98f3c6f4. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/BXX8F2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d0aeab034298759aa3b3bce0f5ad961a443deed0551d73d85927d273b85b50. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BXX8F2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1c42977136f971f2c0ea247b71057d587569314428aa85cc919cf6401c9ae6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T21:03:52Z), 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/BXX8F2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4dce4baa3ded3c6022829cfec03de919042d508617f224ef5f4b40f9640ffd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTRX2125494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19c5c278564580acebaa1dc7812571d6a3aa56be80bfd9b20819697ed83358d. 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/BXX8F2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f1e9877c9ab1c5734382130663c7ea8ac4f2cdbce13fa28d98422c6366cc43. 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/QZ5FN2277747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2632f62895c3bc164531d0583de151538da6e89c997b2f8c74c3f41b4588fc1e. 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/QZ5FN2277750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3effcf1419e366b232173c8a7f14999891739cd15293d8abf04cf7c6dd0e5b7. 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/USLZJ2223861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac2880bf6b5b1cebc985d063427f6c8ff83ef68ac1faff4909729b5616baecf. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USLZJ2294823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355a5f78aedd0bd7e7681d046b04278901d66489c9f66e600f071200a60b9488. 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/GBRKQ2277475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f11937e6eae7f97dcf2f07aa7a7f2f486bfec63e84a8e0bcb3cb5b6bf1091d. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GBRKQ2294725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52e846a1e9a174143bd9924724b0f4d62a927343e2e95d7f78544bc94fb9163. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T21:44:03Z), 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/GBWUL2208322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85dd552f98c647d7ca70860c428b75580d0c83d0531cbff8701f1b0a76d6943. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZWDD2252702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf40b71039c55e6cdddb70b493498289526d4c1e0064d78d82df90e2557da2d4. 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/BCA5Z2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe852676c331911fdd474866c2f0e7182b8fe77adcb810cfe6fc1863a632fd65a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/BRRGE1903422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d90ac3f5f3de1708b945936d2428499915437c408488ceb02165761d3df1f4. 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/BXBRU1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8849ac43f5d1cb750c399a64846ae334c649ecc8eea7b8413def5ce033b392. 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/BXFAS2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475901fc756d5482e003589c86234abc02d685126a5d1e1458744a3cb9f85606. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRRGE1903911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c47f05474f5ee6a5231b8e1a73860a8322b14d0a08057c9fe47b613faa596a0. 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/BXYA62100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8849ac43f5d1cb750c399a64846ae334c649ecc8eea7b8413def5ce033b392. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BXFAS2000007.