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 0x303520716db203bc122791f9243729355a7327c3b2a260c5d1a82dfcbe56e4e2. 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/85564b9c-2db8-4b24-9e75-ccc1dc3e705b.json and https://artists.proofprofile.net/proofs/artist/85564b9c-2db8-4b24-9e75-ccc1dc3e705b.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 0x42322d56ece31b8779ed724fcacca875d1ae5f998ff77751ab93bf1295493018. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZFZ32201772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123a9c79faa305227bc0014a033af2a8a118e5fc286ea34de27cdbf166f7a853. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZK6G2275771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fa2d36ad0aa46241cf53f6f3f9fdba9231d9e010669c33f37f3b743b5749de. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/UKZGC2201566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b699f236edce92422c4b6d4fc7cf1e6c8612a6abb414a563e8874e3438e74df. 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/UKZGC2203412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77920305f17c1003727c48412486d78669385a7a09875926e90f162da1bbc9cf. 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/USANG2222191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d2a64f7511b2bc331b5bf4cdbe5515cefc78601c353c87332be69f8aca395c. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/UKZGC2300695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81299adba08e58e2ff37f9be0a4616545b83f66dec8b48e3656510f151dc2df6. 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/QZFZ22365676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a20fa5bf7adc1d9f70278f3298e7c7670cbf1c41cfcb4f2ea9a107d92900e91. 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/USANG2266656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6708ca72d5b3088009ac21c8d19f1e7d5b4857a96211547cee5cf1829e7432. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QM3DF2224642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f12f3feb8a8a112069bf4e2223aa8ce949ac49b3823e44e943803811dcddf9. 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/QM3DF2278727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e718d322d7e14e7464cee07ae9b0ff511440fdb4b16170607742b99b8f24647. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/QM3DF2295266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e9abdb33e2f22456dc913af73ccce27c48f3e396bdfdb727286b72cccd2079. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QMANG2232107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ea3b56369f14835f76c6ae860ddba0e944bd2983231f3029088efe89f711af. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/US3DF2420055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683bc3ee691cff1f36050c9ad9f39c52c365bb2f828e49556562043a45d4e4d3. 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/US3DF2459781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfcc9e0039e52891b275a6f29003e221b794e05e5db7e9b5ea0febe84745495. 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/USANG2408581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704c6a33b1dc61f514b91a323bd8949bb1d46bf0de98d5ac95e69f29d6328add. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USANG2425289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a95fbe121d73d7fa9960a452c06ee77b0179db9578da3ac9f929761a48eebb. 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/USANG2425290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a2f3e1fa6dd3132ef06dcf577db3b211a0612fb7ca1ac24945a079b15ea5ac. 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/QMANG2234427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6913535f9f1db97e367c3c167e693f5893bfa6e72e85070f9af0b892ad8c417. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM3DF2280673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfcc9e0039e52891b275a6f29003e221b794e05e5db7e9b5ea0febe84745495. 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/USANG2408581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3546d74761da9b772117bda57f3fd027bb4cbd8c36c45a07c2895dfe06917687. 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/US3DF2469833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75690e1ca0f1485ecdddf5ba3d3aebe19d3e8483b200441501fb663373674eba. 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/QM3DF2278314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898c6433609c60d2e09f9eb4ca6c8f8d1762c861d0715fd49bc6dce04b4016a3. 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/USANG2262093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76f31c280ea21dadf8fa15b891fe8a05cf08f46f4cdff81478636e928a313d6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM3DF2270421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247c0a7bc37f79d6de12a23d1128d21f77ffc9bb2610f363d4eb0256cb89457f. 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/USANG2481754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4046cbc51bc83c4aab0bbce707c6760a031ba3f9ad5bddf75e0d37cd595eb658. 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/US3DF2503834.