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 0x3bf65629ba335d7f4abff3fe5cd78fc53592336fd505201bbbaa6b25e8d09d57. 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/19be3b1c-d21c-402b-a48c-fbacbf415e36.json and https://artists.proofprofile.net/proofs/artist/19be3b1c-d21c-402b-a48c-fbacbf415e36.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 0x8cfb42e15fb0325c00b4ab299b320b8e5dd30ebf19ad7d7356bc14d896ac7347. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZTAW2322334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4793b6ab39a9c646e366c988eaad99a6cd2758ae98608f0662e0fd5c19547f02. 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/QZTAW2322336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dbdad0cd9ca1010372ddc58175de120d2c084d550c38eaf8ce005a064dcdeb. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZTAW2322337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe905c628f1aceba233d0d568fccb428e21a00bc793ada5af14d800425b6b2457. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7L2494006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10473281dedbffbc2d8e299384ca9d0358cc371d750243a65d0429aa015febd6. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZZ7L2494007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8083ffdf9270eea322659f4a34092dfe70799ba6e035ebf4bb644c92a73c6149. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZZ7L2494008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e4b7136408336c07b4d761b40da9963987afebf9434717c814f873e98079e8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZZ7L2494009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289c26017c5511a64d9ec8ca4dcdf8040f257fc0d87204217aac905a925466c8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT6EC2559491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369d0e7a3d1b0eb32555adb4760a6fa391410d56b7eba979f029f45ca871ae58. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QT6EC2559492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528b989c4c7c0deb3c1a648fa5a32b2c2a9eeb6de543068f7eaedbfee44fa95d. 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/QT6EC2559493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ff7d58913e5f6cdda549111df615e7fc81cd317ec93b3227e3be2bdfbdc47a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT6EC2559495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf594f6cabbb27ee03044fd5d64ab7bad3eca3100ae563e0777e190b249e2fc68. 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/QT6EC2559496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc1fd3577eaadcf01712adc73a46bd164b69d815b9cef039bd601e99a5990d3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT6EC2559497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9b5ef808b42b5fc26657270dcbced0f051439458c7d9332bb94978e5b88120. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT6EC2559498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d10e24e3e69af92964a0aa8e189fdeed27d36686662a788540d2acaaff01f7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT6EC2559499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f43beabdcd43b7d0469615a3c9fa03c1394445251b89a909a1cc6aa7d3439b. 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/QT6EC2559500.