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 0xc847e748a8798b27a907c2b8778671622bd2c437ed7b331c6d523ac4f5154bb6. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e58409f-da5e-44dd-9d1d-9ef1c10bc9d8.json and https://artists.proofprofile.net/proofs/artist/4e58409f-da5e-44dd-9d1d-9ef1c10bc9d8.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 0xc4812daba4560ef5a03aa4c6cc6a5d075919b8cc91f8b6e2964bd25187a6887d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CLUC21800547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501ac621c9083a72092337d99b046c5067c49fe6ac88b61513111a3c377376c3. 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/CLUC21800548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18825c94dd2c623e118d477a37fc6bc807da4b6181f43759644980bbb567e85. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CLUC21800549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01438da2aeb1222fcf33214255b124be55f483a9cb36dd64e410cbb1433e0cc7. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/CLUC21800550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc529390ad0724a441b2e4b86ba98d3935f587bbc9c0b4451a43c6a8437c3a3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CLUC21800551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf437fed9e1b020d9c65ea511ff3d4ae4dd9b759a7633994877508bca87a5a104. 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/CLUC21800552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b1ac53c7d818625ca1bf5c638780f786556e6cac017f742a780d8671b34754. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CLUC21800553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39508bd48e8ae62bca1c8948c0ed57b7ec3668ffb0772b8f3ed28b5e16ba0203. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CLUC21800554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2121f901ae43486575f8220ceca381fb96067f21cb959ea6b5300fe283737c0. 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/CLUC21800555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb383f8587ffd5201f7355f086532011fee00f26993094ad70667442e44a0dd06. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZNWU2050930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181a9de47efba9fc5c660f2954c3733bbda5d7ae604e919d7b8a4facb2cccb93. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWU2050931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b36c2f1d6734727b51285816fa50f3774a5a4780937cb9b014e9f38866b45a. 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/QZNWU2050932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae740bb762e133c0d1cc7abd490e2a9e3baa658ab0a75631d113a8b2b13e212. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZNWU2050933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975c8470626fc14fea5b1e0015b8b10dd5ba9f92205182b3a798155697d34c02. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZNWU2050934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd76af9d7091491dcfaa0e607d477d8c04bddf6979652b586fd163e43ab4e56. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNWU2050935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1d913e65dd09f0e819764ed02038b10974964d4aa7c1b43a20736353905e1c. 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/QZNWU2050936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c24588faf5c53b8f4b1d0b616f128fdeaaeed58142b69188b1be7213c59292d. 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/QZNWU2050937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff6388fa99912c6db2fed16353107cd1fb0e7be43c9f946536900d43d407837. 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/QZNWU2050938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac10a8b547bd21478803dbef0272c351b4672893fd4eb18fc787f99e5a9ed49. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZNWU2050939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedda1dd3aa8d848ee152b519fd489c30b17104898cbc9a214da0b9abd9ebadd5. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ES71G2231612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34a3e8e4cdff90e2434a960d3efd72557d0cfc4faabf756677e147683c71ec1. 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/QZGLM2540893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa2a9628651d07fecac744f671319eecbcc4ca2c120357de04e0531e76d0253. 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/QZGLM2540894.