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 0x49696c0608a316c361cf9a98c23fab7e58a5a737d5df7e4f3e974cb40e0ccd3d. 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/4a294966-d753-494e-a38d-2784349ad6dd.json and https://artists.proofprofile.net/proofs/artist/4a294966-d753-494e-a38d-2784349ad6dd.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 0xf0fcf480c2c6252da6ef493c4ca89d39a71d755ac8b7ae44d79d22cd7a1b4113. 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/USLZJ2327279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cc69664453531f0f512c8ae9dc3fc2cef58a3dbcb67a9746277c3c633d39af. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/GBRKQ2302886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c3f022f700cbdb7534acbeddf32f8af973244dca38cb54eba81e1e018156df. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBRKQ2382102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213e5ca6953cdb109ce88e9a257cc7ab1ed19b086b0471e426f78d1b2bc0dd83. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GBRKQ2382103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79801a28e927931649aee40ccf1782f95142475a6f69cbed82196fa71dc71f7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTRX2323988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5231f53bb9aac8b95b18b02b2a97a20bf6e5b2b44a5e229211a3cb9789ffe06. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTRX2323989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fa143755fedcec1d6ff4b689945430714850f40388c4a0252932a67d0abf30. 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/QZTRX2323992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27c8db4b8f8b18f210996c64af24effebeb7dbcb3dcc1a14b96ae7badd2b621. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZTRX2323995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbb4dacb48e71875d5e2c8833d886714747e8b7146b1072cb5442e0b38ec49e. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZTV32312584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfe6db3e3e44bbabde3a0460dfa0165a8671a1c03c524e00fcbffa6574c8be1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTV32312586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d6fc30b98ae1a784e34b62d3ff2add2662ad8106a7d5b051b114ad0f21ecc6. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTV32312587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59ac38662626418c58e4c09ed54fa02d3a8659e3b33b11065aa7587ecd7aa29. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZ5FN2422796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677c08f273f644d4d9501f9ef2336d7a10b7b1014963d0491f2f213dd9addf33. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZ5FN2422797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d326027f0c3d782f47f5a5570c404b884c6ec6b2a0b756c992012b62ceeae2a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZ5FN2422798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f7710a1cd316f225ddce90bc7f2e879dabbbd5a67cfdebb13edb1661b62585. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USLZJ2471383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bdf26cd8ff4608ff599b58e4a819351749cbcf0705302a0f57d5ab0331b6aa9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USLZJ2471384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190a4fb793590db1d25b8341b3ee4e62c2413e3f5ce557c855787e5878901440. 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/USLZJ2471385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9aadd5eb6b89e71fcfa88d2b774182d5756ac53a1fe404c662088557acf910. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USLZJ2471382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf1d662c97a2d9c2e85a6dc20449fa31919ac1017bda96a712008dd0e0b6dbd. 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/QZTV32417512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2195de056a9df2753ac894a9b34a0400ad7b2e5c740f9d77837f78f8536d8b. 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/QZTV32417514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb046fcc34ea7dc6110f5590b20988eb1f91f73e2523b9f9618e48f7f7dbd987c. 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/QZTV32417515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b422980dfca6458207bdce7e5d00b950a9ea55d4b0c879d6a9b23b7355e647. 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/QZZ8A2483185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b24510068ad1d1e2568666b8f5e9d30598f1f98ada95f73fa7dd04265fe9a1. 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/UKZGC2501643.