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 0xdaec23c586bd149c7663932065bf13fb230d23aa9b90af46f7b19401954d9f8d. 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/36f9df3b-1fe8-49d7-a80a-8b8fe979b62e.json and https://artists.proofprofile.net/proofs/artist/36f9df3b-1fe8-49d7-a80a-8b8fe979b62e.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 0xbf09a3160398dbcf1cb6f77f3fb3e8679539080153786bbbd643187fb0369794. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN52008275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16cc429ea13250f15650377b719f95f5596e08b728cd16e4437285b0cea77257. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHN52044450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4817884be16be85eed39301c70e2f01180876557e26b9fa139183988e6383f6. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZK6M2056718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c9433fd84f4713ba88431209b084a284b6b885ff83fffa74eae632f06776a5. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZDA72167284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5fa243502cf50862dcc3834d71ce174917cd110a77a5742e7ad0321fde3822. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZDA72167283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c9433fd84f4713ba88431209b084a284b6b885ff83fffa74eae632f06776a5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZDA72167284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4864d3be60cc30c5ada608a2ed7654c68b0bc18445fc4d5dfec462ad00ef8c5. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHN32427358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7436c57ed3ad7f3433d3f27d01a82d2b7126d9f7c6713c605a2c724787b2e23. 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/QZHN32427359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bfd79367e6d5bc7865ad8cd4a188935d06aee53ecfb575fb56ef01a4cb6059. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CA5KR2337536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0f05d488ceb61c55810133cd207c345e438d04ae5a0599fade0fe7080563c8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN32427360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bab4af9ff5b2a79baf9116db90eceb3790c6027a1aa8bf64e0d5d31bf0921ff. 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/QZHN32427361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebfd11d9e466f466abc0609fe5bb046932449d5a3d117e30d2cf611d4e0348d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZHN32427362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054b0d3c6fdc98efbfce736a7dc049972c6a3104cc2ec0f8010ac7dfa339b4aa. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZHN32427363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ac2ec6378d38f596f200773ee2f9fe8c28ac3b80567f093db4d753dc930f1b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAT2390590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd601cfdf1cb1dfaedad554397dcd177bd898c75def439ecdaaea6bc3b94d2f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHNA2121826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7981539bac21572958257417cbfd99bf37fe04c51ba31e1709888898fa7ae320. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHNA2121827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b18edd50e7c0e3b1ce4664c81157d1426aef0af4436579abaad032b0ca0c36. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZDA82510549.