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 0x4d124407e29a2399904ba956ec59f57885b9b8ab748d2a53fde8163bff636d67. 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/09183acf-c3cd-463a-bf79-876468149464.json and https://artists.proofprofile.net/proofs/artist/09183acf-c3cd-463a-bf79-876468149464.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 0xfde57b7771ac347044e0b3922a5ef5affa434ac7dacb75f8270ddf6387bcc85f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZES72191653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd88b31a8b61722ed2287786988d6be0a6567c464edf3a72724a314f4a09bad4. 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/QZDA42202855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce24a82b71928ccfd4857119bc9414aa540ee7b30b451cee813201502579bf16. 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/QZDA42202860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbfbc6f105eabbc49bcf2a072649d12c35d58eb72d109b2a527802560925a32. 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/QZDA42202861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873ae3dce1be8dd3fae09e0eed196640cefa94e9cbb3ac1a599fd3814e0d4229. 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/QZDA42202862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f0fa9c02726b0b40d6cda7c98a9601db9f7549a772c20344cab840f91c453c. 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/QZDA42202866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624413d307947ff1b40d3e67d289cdf69bf71327259de2fc7d2e9e267f5ee5c4. 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/QZDA42202867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a6549aa45630e87610b51349154801b5976e8eb5dedbaed601155caab25d2f. 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/QZNWU2198368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a411897794fadf85eddbcff84ad4c4046ae8744bca29431be6dd8ae127aaf4. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZDA42202872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d952555aee907e1930cc9be1ee0418c99aa2b8ddcaa79d3dfdfc79ea7e65db3. 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/QZDA42202873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c16757ba829759eb05dde938196340c53f335f3cbd8446fea8404ee34fc884. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:30:56Z), 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/QZNWX2210016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f032c6c43875ec9c3c815a7d98011ce6bbf82ee7bdff67bae1031dc6dd3e89. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZSYP2374663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d59b523a2020e32765843ecf118a176a1c4bec978d20914739edc8c949073b. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZQAY2457738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033191e866055989ceb19eb2a23839f6b616b42be1289a47b65aafea84380d2c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZQAY2451519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ab00e3d6e4c9e105ec874d8aa697ead3264750b25f9bc105713fe218c44888. 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/QZQAY2501382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8d0e3a0238489a9dfbbb902a9da7a10daf0db88d58dc2c6d6edea337f2d9e2. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZTLA2551159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6234a859e15ff93b82e4a7ea0ae817e0325ebe54714ba33722cf823426921068. 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/QZQAY2593343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b51565879db209a428bb5beb5337bbd828ba310676b8d00115ffe7457ecbac. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZQAY2585201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef2a7cc533be59b7a1ce42928d83784b6672e407add2d1cabee954fe0deb382. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZQAY2542495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf7f605756a4f92c676147274f9af4a0461a94ef5fbb7a0759eef91d92ccc15. 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/QZQAY2599146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eaba196ac538f51945ce693af0b405841832d1a99638aacf93e807bee2bffd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZQAY2537024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fd4e7ef6d430cab89fd8084f209309908194b52cbbe463cad33f240cba8202. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZQAY2514935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebded8a6d42a156e13444b78baa9b3803daa772d2b323c6c1f4f163fc606e95. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZTLA2559924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3082123be0ad1fc47cf72a814a39a9d3508001be1f024d76ba5d6ca3ad80c124. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTLA2546080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f032c6c43875ec9c3c815a7d98011ce6bbf82ee7bdff67bae1031dc6dd3e89. 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/QZSYP2374663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853fcebd4eb227cec7012973f6687aae4dc1bf1cd386ec5e7007efd33ecd7a40. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZS7J2582469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7c169a00b5bba82006acb0a9f9240ebff054265e58152abdb54c02fc12c2d0. 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/QZS7J2512713.