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 0xaf3e797aa22b1477a2aea801c26ea5267eb25e6473cf85005b231037f3b727f0. 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/238e0d9f-20da-43f3-9369-0ee103ddd126.json and https://artists.proofprofile.net/proofs/artist/238e0d9f-20da-43f3-9369-0ee103ddd126.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 0x8dab01f259bfd92d0c063d7804bded2fe1656c1bddd036c26c640bdb5615a3ad. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMBZ92069844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f568bf23111b26251431644ee18685ed287ca6b2802643d67141273378248b. 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/QM6P42176325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6794ed03a6ca448a4fe589858de5b193dd6b87c09bb41db8c9ebb9b6ca329e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM6P42176326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024f90785b06c713b756fe25f0ab24650dbed4ff120c08aa7cd5c54f3d3d5306. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM6P42176327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5729bc496730fdce7f4f92daac1a51b7e274d07e674afb0df4ccbad20e0f3a94. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTB22233414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf786a4833bd033b159aba77c988f54a1707f6f87283df33a846eff59b8aca3a8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTB52257683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9b34acdf8b50a08b9df16b46f4d5fb2bc46cd343eac97f22c09c810e5dca5a. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZFZ22326629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316fc48882bd8c420c7cc6f2555af127af020f3fb86102112c50b81346bc04c5. 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/QZDA82330147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4fa6b4d358da7898032ec7e36b4e99e39d6a935db1a7b5f27f3522d6f8acc6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZDA82343507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a74a208956f60ed218babe2fcc46fa3077d6efe62f53ecf47236524ad84a8a. 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/QZDA82343508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7094af0bf466f883f826cf5272272fa8e5678255e8b408778b91a8c910364bbd. 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/QZDA82343509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e37ccc63a40b7ace042515f7d8d8192b9126ab2d5f10077f51c2b28029cdb8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZDA82329790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39f6c8c7465fe7c878c8eaf8d2c303b2d9819926e2d2c376d293149327ed519. 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/QZDA82343510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3070f05073632a338a56af0c69dd02c1ba3f99835695e240488fd6836c8f8b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZDA82343511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d2e4203063088ccda8b0ef16dc40afa1f488fc7e75da793168aa7689e8def7. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZHNA2535271.