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 0xcc4e3b2b645252840743ebe38134f87d3365d3028c31dd81e74d8bc90230b321. 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/2921e4f2-edfc-4591-afd6-8285543333d9.json and https://artists.proofprofile.net/proofs/artist/2921e4f2-edfc-4591-afd6-8285543333d9.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 0x5b3ae1ce5307ed52cf490f802b0e2c5ccdf6ef1dedab6e35ccf13c2b73a584e0. 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/US23A1563888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b7cd988347d6d4205bb43d9a97af640bb1607eb51af13170dd326caa8bf60c. 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/US23A1563890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1a6120a038a505e9e0c9e8ad88b914a37f069e48bfc0647aaf320ab9bc1e96. 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/QZ5AB2307393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6af7e97d19cd1f1965291493ba695421904b0e861f29168cc74b4c54abe9cdd. 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/US23A1563892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9e5108b809770382dfa4aa399570af8e7919e745a2fa3e6bd6fe4403b0034a. 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/US23A1563893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf8711602c6f9149f11bc2f3f3eaf9e9f69c8e16f29df55ec89ebeb054157a5. 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/US23A1563894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadaffe57504f7f6f6269215bf3a593f92a52cfabf3176f5a3eb433973f54b3d7. 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/QZW9M2233092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa816bd3b77174eef1a7545f547673868dfda33ed258f0e82632f46d2819c2f2c. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/TCAID2478554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf051728c6046eaa31c015a29c336fdd59cb504aac999769d808d5f34a7b4b7ca. 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/QM6N22372332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222b15ef21b5fd5f2ba769b3e1a89736fffdcf1d55fd93764a31793324331869. 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/QM6N22373025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11afbd27b41e69061adc9c5e5770d16e4509cfce0f24dc34b23739ddf16c1b83. 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/QM6N22377724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53796032e47374a84eaae2596dbf1749bb5ea3e4ee9fb67eabc7ef1bde3002c. 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/QM6N22372901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9abda5c758f52b11ee45ffcdba75a0c0b26a1524275328919c8a10d3c2699e9c. 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/TCAFC2091169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6e1d24fa768ce619cea2decec8913abf660131f421416d11878f96d1ee23b9. 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/QM6P42390313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf99a145bf15989e9201ddf62eafdd8d9dfd2c9df59b5be8b31c5c420aae94a. 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/QMTND2200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7627921f98e097fd994a2516c880b6177a734b4dd67d0b34b9d571bdc26b580. 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/QZQ4X2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf051728c6046eaa31c015a29c336fdd59cb504aac999769d808d5f34a7b4b7ca. 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/QM6N22372332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53796032e47374a84eaae2596dbf1749bb5ea3e4ee9fb67eabc7ef1bde3002c. 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/QM6N22372901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222b15ef21b5fd5f2ba769b3e1a89736fffdcf1d55fd93764a31793324331869. 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/QM6N22373025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11afbd27b41e69061adc9c5e5770d16e4509cfce0f24dc34b23739ddf16c1b83. 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/QM6N22377724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7a70d1b8656ef4ec7f9f9c9b06f08ab7a303e0cbeec7f2880cc43146736d98. 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/QM6N22455628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43119b99fe684833bb8e7cdf894186b89e3e5194b78adde9a12956ef6875862f. 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/QZ5FN2363576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b2c720261e97571ec92bd62a2738ec74a7f0058769d88f1d8e1dbbff949170. 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/QZ5FN2363579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8053c6de38b50383f36448acba0a08ded96c366e28e76fea7298c49d7cf885f8. 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/QZ5FN2363580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b3583feb88e115fe4a605c42b56ea415ac50a75593efb6c924d5cb46aef5e2. 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/QZ5FN2363581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b186041eb6a45fdd48d4aa5c3490e60d68e71a265df1edc2bb3d0c39e657ad. 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/QZ5FN2363583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1dec22f5d88b78560c68863bd2a358507134cc85df54767499bce02617d1e7. 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/QZWDD2294886.