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 0x63d1a422c99450d21e9588fae7f3c58453df090ba01024d5c6e8182dd1fd7ba2. 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/c4b86e91-f0b6-49ab-a0e8-876962df9327.json and https://artists.proofprofile.net/proofs/artist/c4b86e91-f0b6-49ab-a0e8-876962df9327.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 0x1e9830c2bb8067d61f187d870090eec9c5121316b64ae7e19f05236bccceec01. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWS2416130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af5c762755e3a1ad7570a3ac47fdd77dab488b6a861021254c7471aba3ca465. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6P2371997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6d7b1262ec4e980060e317e048ecfbd6f00affbcccb4c9b10638d44e121332. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTB82390653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbb533b540232aa5cf3a02d11f44290297095519a85a3581def0d265989c0f7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB82390654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d9d57f66816ffc63f67397d9cdcdd59f2e446c7d97472f3f446d820c70166d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB82390655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66ba08b4e41abc5938ec288554dd19090681271289e82a3d7fbc8873bc005e9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82390656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe459dd9be8cb1cf3c913f9a9b2458370acb38c56d66bcdcf6ffa2000686585e6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB82390657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fdd86bb52103867c5562fc33283378f3368d3f9435c423f38b4795f6e3ead8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHN92399663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d55ac601ff313afdfc42423bd5c99a968ea325276c4a763ec9f9631136a13d5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB82390658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845221f5b3cbb6b203f312e5a9c2c5204cb8e6bc8c1c09e0efe14f9ac934fe47. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82390659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2996302a0460c62997ce1de3fced23714af0a3a7f0d18195d98a43f39778e169. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEN2386454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7b2641b7d71e69ae21d046474ec6824675282cb8aedfaae9da5dc25d4bf626. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82390660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673ef87fbc32fbaa15b9223e172b9479ac4f4cc82728a819c9cca43db409ba9f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB82390661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48e855d2d957032d0c4539fb6f8fe67bcf224c467c395ef342364e8814f7daa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82390662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8452348b1fd99a247a00b17fc9100cca33c2b7d0369dabc07ec2174c0c5447. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB82390663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671baa2658690673a3ffdc71c49eaaac83ff1a6118cb71e557cb6488e443bf44. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FIBAR2300009.