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 0x8ea53fcfbcf869cd507e2a22c035b62f7dd78faeb5dddd8c2953a31073fb0289. 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/5a007c01-5e02-4310-a6ae-f4023ce669c9.json and https://artists.proofprofile.net/proofs/artist/5a007c01-5e02-4310-a6ae-f4023ce669c9.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 0x2669074b4c66ead0e3c022d5f0c11ac400b42140376283b406dcd0ccf4975310. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTAY2221569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92b488491094b89b4167048820594bb92f6fe94c2426fc1c657176547b3985f. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZES92305863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0ffa579142570453d6bf17581353134c709440022405962d35745a19117cf7. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZES92305865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d02f0e8deeb0e4457e46074b32b140a42d10416f69466a553469e4a6958455. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZES92305866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff84c16cfb4806df9950705c4a9aeb872bff128ac0306d5477882a21579b3ad. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZDA82398835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf7a01dab121fb014993a7e72b13d0ae5683d72c4ef5ec2b514b8cee9f84fad. 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/QZFZ62460871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd21359a0751dd6dc9bb13b27c8ba31a2e0857e8cb31926e91e864f0f850459. 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/QZHN72412048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbab14c66716e29e51780723c96ea03ee0427289e9056de974f4f5b2336c6639. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWZ2428764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c34255f5c6a82a19f5077e69a7c7c3d19bcd0b1fbee4f8dd30666912e8eaaf5. 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/ES6102426201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff40872543e458d03c8a1e0cfb5f0440e5abde3a7a5823a7c86b782a42324b38. 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/ES6102426203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9c4a8f2d5cf766aa851db206163e1656e257a1ec7c59eb6fd6e947ea2fc3de. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES6102426204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfe4ee2209efdadbedae72bdae0c4a73dc2d9fc1f90ffc640888941458a43bd. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ES6102426205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf7a01dab121fb014993a7e72b13d0ae5683d72c4ef5ec2b514b8cee9f84fad. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ62460871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cae5a810e72d134488348d071c0df245807441dbe0ff0c5ab6a444ffa3db9a. 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/ES6102426206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515be6b08d053312cabeaac7324e5c7891828bd7cd9325a827b06006f1446838. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/ES6102528606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c5a19653f9d3e17d3f58841794f478d881d7543edcea340a40774f69311cc1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES6102528601.