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 0x90b54a7da0caae12542ba64b32caee3834e81f276654097b5d9a5ffcae4a899d. 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/159d687d-d896-4a83-8d0a-b1aa0a947e58.json and https://artists.proofprofile.net/proofs/artist/159d687d-d896-4a83-8d0a-b1aa0a947e58.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 0x9978defe562fc6599d67dcd0aad1ba3e52ccadbd4a948c99104fdbccf95d560d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNJX2000177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d631f47ae76e9d2b62b10fd55afec1146f99f6e902dc97ba69b000cca6f6779. 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/QZNJX2000178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0d361e293ec9031e636de3ff8349b64c5afcb1d18acdcf44ae7910b1964fbe. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNJX2000179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84bd44794daa8f9c951b6d2ea6bada98a9fd0c4a1f262584e6e4d68afbfdd91. 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/QZGLS1962350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798d77084261fc8fb53e3211e5917362dc8ddba858b2396cfcfba5963a3505e5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJX2000180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff9507c2a5107d592f516c047c56f39632c934bb59fe6c21230d6ab549f70b1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGLM2064523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d49728639d29d316ad4af12a60331865a1066c177ec9c3072749fd1cdadf03. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNJX2000181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2c44e59437d784bdb4f01e03c92acfa29e0829e8eb74c6ab4bb68f9583ca8e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNJX2000182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a0b0f422ff00b5c4f13d31c7cdb78a441150d195920e332bb5a44371c7e822. 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/QZGLM1986903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031ca4735b75946fa0618fe914b163c76bc86a93fe05e6bb2d231cdfb0613560. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BKJ262300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8141d57848ca85c50ec340b434393d39c74822bcbaf807c077a5b97be69215. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BKJ262300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce369858d52fd0626396b5f82d63e68ecd3a76e11b5264284c7c0f14fe4ff7d0. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BKJ262300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976ed52883a8b8ef25de209aef460603b9d3c4f21f6d1ab665ae1302025bf062. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BCDJQ2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146daf5721517659a9f5554059a88aef9af61beb97e7e338f1b965e5f5119b77. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCDJQ2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6029462ffa475099a9fffe96c4a0f1ec9eb59d573da5ac7e2a22b3d2abc5282e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BCDJQ2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9d4330ecf165acb19650bf521df3ef2cbf8ab7a5648a368441a94dee3d3540. 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/BCDGA2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff9507c2a5107d592f516c047c56f39632c934bb59fe6c21230d6ab549f70b1. 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/QZGLM2064523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a0b0f422ff00b5c4f13d31c7cdb78a441150d195920e332bb5a44371c7e822. 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/QZGLM1986903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84bd44794daa8f9c951b6d2ea6bada98a9fd0c4a1f262584e6e4d68afbfdd91. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZGLS1962350.