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 0x4ee785bed3a2c60c0973ed2654ab295f3a8ceed4d608e32c26b041339c9d4a5b. 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/081b3915-eb1c-4ad0-aa64-ed7fe7b74add.json and https://artists.proofprofile.net/proofs/artist/081b3915-eb1c-4ad0-aa64-ed7fe7b74add.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 0x8a820578862b6215181fe2e35f227e4021658ff1bb6241d239de7495ac3183e3. 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/QZNWV2435372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797c5f827e15d6c6277d35dfda56665d23d830451f9a45a81820ea1c3392f40c. 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/QZNWV2428600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10a4fdbbe53245b77a9d19ae953b8083f3e60262f57078e6a38288b2c61d681. 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/QZES72462915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a8548cfdd5bc8663fcb3b4275b335d58a7e6e0ec93521d8ee24af7e1d1c644. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZFYY2458409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a580b8a798584d266df914a0d09a7d7db02d1916b4648fc5eb8d051a1c3179. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZWFP2394469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a109f594a59688917096d4d3cc2067a820f37dda9188f0952ca360ef9f69d5. 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/QZRP42375474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598144713f6681f7dd750d77515a7e4f696997a6e8841fca4a840de46ec7823d. 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/QZMEP2395323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d555d59223d70f4753989a99918d385e1d205394d07a6f28dcfa4375b765fe. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/QZHN42376156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0925630166eee363bf9349c762683faa8140712c7ee34d4e1f7991c48a7abd9. 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/QZHN32378445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79578608970246c8ccc7886586707228926373075c72f17c03d444941a84a40. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZDA82388952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523b37d8ca96d1a7b59de5d3683d2746a2f38116e91f9b06c19004120ed9c8d6. 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/QZTB82250750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf317fd47b624d3a02fed1a32add96d1a4c304d3b468160da765ccd2eea04833. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWT2266939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6512602fcc5baad07a8990a236d7a34b36caa616fc6ab2ddd166d803b9aead3c. 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/INM432100057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37dd13de894fba72674e9d29ba506d51659b93269fc10531b4a05b52fc8a7da8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCAFC2014117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b971e8b18870368af3aed3592e566592ae1c64e34dbcf1b90f90f1a7225347b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCAEX2011727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c8e937445cf6e0ba3ac363a77c979c1b0b7f98c5c7680a27b3642898c923e5. 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/CAGOO1979474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac183244fadd7de5d87b41ffb3f66342a7684b1bd76cb22bb18fa23c4fee55b5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZDA61991380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84bfcafa24732d82e87b2dd026476c42cc304a555b83354d9534ef1b31b39d3. 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/CAENV1912057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247c048f178f0ab3da31895c885ab2c3211ca6c04c4656d35f8d49f4ac18b116. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZ8LD1997298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd003414b7cbf79a77479cb51cc6a5014330d621bc32b7a212cbd72c6ad642857. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TCAEJ1941174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2559a07dd97ee21779918d1e31e686b12dd541c675af74368e2d1a020996bf84. 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/TCAEJ1941176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b15a144819b4c74c3750f278482dc56110a6a48937ae7d6ff1fea6045a5135. 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/TCAEJ1941259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc581fa8b0b536ee6ec9ea1b6bf64d01098f82257a4b228fe23cc68cad75908d7. 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/TCAEJ1941179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7fd135018f54cf64b0675022052a79c211fd0ab90ad5ee740cba8234e48757. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAEJ1951420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a4bca0f90e780096b8848a20a6c8393a52756177d8f813bf7a6f4fdfc8cdc4. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/TCAEJ1951415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db8f9ed3394e26c93bd9b981b652b52040e4686a3fbcf64f39b9d9326b8b7c2. 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/TCAEJ1941265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96e735d8974b362c56659771a4b34521767e0b9112ddfb715446862cc6c576e. 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/INM432001033.