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 0x13007461e648c85afe587ceb5c9edee31af66159877d7049d34d8a5c70f20bac. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15fcb66d-78df-4c87-b9e1-c8533c50e38f.json and https://artists.proofprofile.net/proofs/artist/15fcb66d-78df-4c87-b9e1-c8533c50e38f.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 0xf110fbde0e2709a046c1fd896969208ed42ca07d2a1f3e45e9e0d8e1b07a9892. 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/QZTAX2279065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5a86c42f9105b56043aa9e845e9fb0517fb7e82ff35916eead4210ebea4c7d. 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/QZFZ72595200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6186ed244c5412c77dbf14eb322eb3f826b5c49e3bc8fc288d968ebbb6924634. 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/QZFZ72595201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d61c2e526eb528cca910b06840f8535960f4296eb939db6b99b64e6a61aff7. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFZ72595202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe514e64e8fe77ea6fa51b079d0ac60eb43fe3a30e8fb13fed3617d92412aaea9. 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/QZFZ72595203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf9ac6c61cb4bcfe22f79ea9bd66b717c2d941f7208b74ceaac753e26ff3555. 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/QZFZ72595204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ad342298e98fafb874b1548d95ef1219cc86e607f2bcbf78b0d1c5c8b5f922. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZFZ72595205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacd9f43883b2d796803d8fa2dbf16d284c9317b183d3f2d759d1654b48321a6. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFZ72595206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6013e76deaf0cf6cbb1a4b84c9e60e7235fac20f1219e4ca909d35a35d9a7433. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZFZ72595207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5a86c42f9105b56043aa9e845e9fb0517fb7e82ff35916eead4210ebea4c7d. 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/QZFZ72595200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6186ed244c5412c77dbf14eb322eb3f826b5c49e3bc8fc288d968ebbb6924634. 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/QZFZ72595201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d61c2e526eb528cca910b06840f8535960f4296eb939db6b99b64e6a61aff7. 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/QZFZ72595202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe514e64e8fe77ea6fa51b079d0ac60eb43fe3a30e8fb13fed3617d92412aaea9. 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/QZFZ72595203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf9ac6c61cb4bcfe22f79ea9bd66b717c2d941f7208b74ceaac753e26ff3555. 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/QZFZ72595204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ad342298e98fafb874b1548d95ef1219cc86e607f2bcbf78b0d1c5c8b5f922. 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/QZFZ72595205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacd9f43883b2d796803d8fa2dbf16d284c9317b183d3f2d759d1654b48321a6. 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/QZFZ72595206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6013e76deaf0cf6cbb1a4b84c9e60e7235fac20f1219e4ca909d35a35d9a7433. 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/QZFZ72595207.