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 0x928353b87622bddc3d0668ef7322279725fb2056c75183939a1738a0f93e1077. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8faaa643-5d0e-47f8-9a36-95f5c0d6e52a.json and https://artists.proofprofile.net/proofs/artist/8faaa643-5d0e-47f8-9a36-95f5c0d6e52a.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 0x55dc68cb4288b8f76a168d754355f97709dc8282b8c083c0ba629f2931db4306. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:06:44Z), 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/QZMEN2375201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317182c26d3d5d5c68c241c1ffef0de2bb99abd6c968b761693f51052c4e37bb. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QM24S2307100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3b4e767066af18f829e2eaf3a04c72b90ef85ba69a152dad8b5572e64a7df3. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:54:27Z), 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/QM24S2307094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c3893ea1795314bd6ff907b0d88559f8239e9b22f16eb23e94f6a717d791d4. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QM24S2307093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749268720c3f5c399b064e01fc492736fa39ef9f71f7b96de6cc62f891ec75a2. 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/QM24S2403890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ccf0f062f7cd42e3cd67645d8e8fce51251b77ca6ec54902b78757f83c9d19. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QM24S2505662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60bb0d6e9399f59fceaccc07d106638c31e1e56dc35514e118688e2a7c4a28ad. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM24S2505661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c300402e201492ebee5af25ee7a6c210bb3adddfb3860978e49cbb7b60172b. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T15:04:37Z), 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/QM24S2505660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba09bbe1484842f36d6155ac92517f4d5ca318a383c40c43f7de217dc8d49a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM24S2505659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2bf4dbe0c025e343ae1ac6a8a62fa925fb1f8c4e88716ce4c2fa38379c1f6f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM24S2505658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfb6ebba1c0f28c6c0182808cb6fea82a784ad954854fc81681e0a1b2104fba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM24S2505657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c170603bab1fc5093e9c21a3c4657a1e3f418bd44a50dae11c2adca825b7711. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:44:52Z), 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/QM24S2505656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba40fecb5c4907a8f04b7d628920e9c5f3f3b5e8bc04950eb23bedb302bf62c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM24S2505655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c20b1fee97dde387a56e797b71be46345afeccb7f1898bacf24665dba29f60. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:44:27Z), 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/QM24S2505654.