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 0x19a0ff992a5464427593f311116057d379be6fe61cdc27771a05b12c7ba9ffc6. 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/9d68981e-a9f4-446c-96d5-9f156160ad0a.json and https://artists.proofprofile.net/proofs/artist/9d68981e-a9f4-446c-96d5-9f156160ad0a.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 0xc5743eb32295d84191a0cdebf58849e0f1eb538001e75b5a9df7db35fded3752. 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/QZTAW2594004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eb1ddd4da42e6d7d98a0c8e4d51ba2eec2788dd614fe857e152ac3a08b14b7. 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/QZTAT2589640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04dfd8a66c9893f9e225538c3c589461c00ddfa8de3fa04abc090a2e03a6724. 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/QZNWQ2553036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f39ca4b350f1d0f562fe454a70b69c2611455fc95fda9ce40d242ef5d97fec2. 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/QZNWW2570091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673a15aaf139b0356c86554a5bc0860c09575874724edd6592aa510d6ca7471d. 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/QZK6G2518342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518537017a18c4b971d5f8bc8e9410662c313c35453e3a5897ac4c037a57c42e. 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/QZK6P2556371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f0bc44708a5611644fbcaea05512d8d68caa99688d9d0e60e4e9ecf48c7e3a. 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/QZHNA2515566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb618ccf31a44861a64bae50885f56ba1456ae09e380ecb389d8334a7ff46cd9. 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/QZHN32578037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c638f84adf9d1d3b03823b26e8ba28aa397f5176ddceaa41a3de2cd20ebf7a. 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/QZES52550284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33032ed6c46064c75819e3f7656c93f6297c190406f0909f06e6c9b3f7c4038d. 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/QZDA42577103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e4fda42fb41f741dc39713e82964f04fc6f41f070ab6d6c34ee2ab2b3ef750. 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/QT3F32450446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4768be290750389c6220c4d064df43e2f78b6da8c38c960ab8ffdf96626816e. 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/QZS632539573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f32d33e655b894472d070292f2e2458db15a64bf2f22b19f48969b5f169f14. 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/QZZ7V2458774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56332cc2ba7547449454a150b558591733ef694cb59b01b26bb021b3e6511028. 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/QZZ7N2458992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3b479f86ab66a29da0d50ed1693b9a582b07d5bc3b38259813824a1d17dc32. 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/QZWFN2453872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5005ea44673676e39e4a4b72996f3fb2c2a35e82aa68b08a07688f511d40137f. 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/QZWFK2412544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0049d3cfb7a31089a8181c2f37d9f0ad9213c6ca383c0aa868988c8dda37cfab. 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/QZWFL2420328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739eeb37e868ae198aaa00d6c17526faf62f764e24ee79b4a3efdbc3b0e668db. 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/QZWFE2420759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8dcc5ec3cd2b13525de9ab8a73fba7df41b35ff09f7e73de04e3f83a057b538. 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/QZTBB2421726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5cea0ee844901e6c556d9329f7bb4420f8bb870bb284c577869db44cc1f663. 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/QZTB42447156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a720feacd24fd8f77d1c3da45546c59f8807a783393acb3487528f6751747b5. 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/QZTB22444994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4cce3e4814543f575d66cd21beb7cf36c574ee443f6ce64817ef2de6d1159a. 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/QZRP42428744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2ebcd4bd86ae97361117062fab4830546b6ff5bfd8753fb343efa7b0a7b247. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWX2430306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4aa8be0f646d68a245a644268f62cdfcf6f47c1f7101a7386b75697f4ae5bba. 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/QZMEQ2487683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e02271c26df10555a71ecf008edafd2b9eaa2c5f6ce0f767a6cd7bdab021f47. 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/QZMEQ2401759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d7bc5e2366736fdf44a1b1f4c72362818794144c19f79faba09120dfe51f77. 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/QZDA72442744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61400767d15901d09340c30e9e36bd08ab29a826b60140258ef3374a284c75d1. 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/QZFYZ2588253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506a497ae777ecc0b34233dd347e4fa5206043ec5136b293e6e5682a5bce011e. 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/QZTAT2584500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5a744ddab36a2caf4163f69c1f4eb11ba15d4e2e387dca4b05669beace0073. 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/QZWFS2412219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769c7c59bafc461f8d317c0016f53d4703ab3919407c211d98d7d8f50f0062a2. 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/QZWFS2412220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8a86f1fe8979cabb1e6504b317b7dbcf15289ff06935c03f6a5aee2bdda2d1. 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/QZK6H2409200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e80ef5eb0d9519ba8dac0fde1e39e9b7194c5263d6eb740d895ef648edf919. 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/QZZ7S2424596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc20caa9f1be9840a366f9cdd040ba022cc233e47051a4476a673971195b2af5. 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/QZTAY2468402.