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 0x68f9802bbc5a98dc1c5ecfcb2622e7362316cb9eadd329016e11871784707529. 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/4d29fbf5-f289-4d3d-8cfc-701f0892c145.json and https://artists.proofprofile.net/proofs/artist/4d29fbf5-f289-4d3d-8cfc-701f0892c145.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 0x6cfcaad8880ab58dae1e7e38951cc089d5fd1de204ae3733b2adb600b883e1c0. 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/QZTB32381817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e98a1b55b9f1bb75ae39b1eb2a67f6820c0f82a9e2728fbba915e596ed4f21d. 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/QZTBB2301040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e98a1b55b9f1bb75ae39b1eb2a67f6820c0f82a9e2728fbba915e596ed4f21d. 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/QZTBB2301040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe910dfa2624bd907778529700a0bba18abb80c4eba5c2ad6eb08a5f20b8c18ed. 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/QZFZ62472433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae384c2a0cc2da144e88edb23b64b94d330c25f585e4daf43067880469d72e75. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZTAX2303458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae384c2a0cc2da144e88edb23b64b94d330c25f585e4daf43067880469d72e75. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZTAX2303458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cd200dcc0aff6eb888dc2db33933efe425ba63b4745868ddd3f3dd55194c52. 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/QZLL92494360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0663f7e5944eec2cbf55023efb80b8244efad2dd483a760cbd395b038da7c463. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZTB42446030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b12e28c5d83518c3276e04b973cd8ef1266ed018bc4db41fe6cae93550b764. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTB42439055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336b5fbc83ed22a4b3da87ec0e64aa7c23661199ec1079d9a7f0a06f05188fa1. 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/QZWFW2481060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614ee484a81353f99a8d0dd9f3f4603bab6a9a03c22c14a4f698ef8c5cd72914. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZWFW2481061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af458e8ddd80e04da3f6f09291f9da7822e5a604603721aaefd4a1dd65ae059. 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/QZWFW2481067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4816c0b8f2e7378d61459f76555b9b885d809e4f150e3482d1994e479b90ec. 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/QZWFW2481068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d59502a3f7ee83b2fc92ddd3d0827c6797d91f7545381525f0c18d632f5a206. 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/QZWFW2481069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9165f4c971a9e931d05fd706f9ed18f0f4e6acccb2d86738f5e9d0556ec634. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZWFW2481070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc7ef48043799369493a040b8422bb9dfd029f7e5d282e1f952e74b56d90443. 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/QZWFW2481071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336b5fbc83ed22a4b3da87ec0e64aa7c23661199ec1079d9a7f0a06f05188fa1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFW2481060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4816c0b8f2e7378d61459f76555b9b885d809e4f150e3482d1994e479b90ec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFW2481068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92d9320285971eedeed52f4fc7b6a50af0bdd7139d178fd344fe949090e903a. 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/QZZ7Q2409574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92d9320285971eedeed52f4fc7b6a50af0bdd7139d178fd344fe949090e903a. 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/QZZ7Q2409574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4390b7149066e54067d31c32478831794b52329ff718451f8db7e15bbb5723e1. 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/USLD91780088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1273cfd5d8d3d4eb3050f2519b0743fa9e4ac8d6048e91c5c24e27c77c42f7d. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USLD91780089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0d0de8481d09b76b6fc6726a6b628f258e2b24beb0e28e5cda00871e4db528. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USLD91780090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bd720d56726a660508436f8cbcf7f29e9ffe4ba6719b202b676b86144fdc4b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USLD91780091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eff89e26f6ec434450fe195957839a7e55d4cb69dec31a7305b1771dc7ef508. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USLD91780096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdcba7ab58c88ce50bcbf0d0af2e3aaff1db6127d25e6af2cbd24ada1443941. 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/USLD91780098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee9832a64864d7f970b4ad47b983076f5ea1d5efc49bab1efd30af88e8198d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USLD91780099.