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 0xbbacb740a041d39872fd07f893d82d247b8b4b7d40e34a93bccb37432aec47ea. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5522896-888b-4352-9fbc-30d43cbec474.json and https://artists.proofprofile.net/proofs/artist/a5522896-888b-4352-9fbc-30d43cbec474.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 0x55ef2e0092f2a6c76df2d3a657dd3918fc8be938d8f8bcec4c5e4aa3145fe39c. 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/QZTBC2488622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a07f5f06bb3dc29c476ee686cbe8c3fc0c729489ac3e23258788c926b95b13. 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/QZTBC2488624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5533e8b408e35168dd2c452c092e161b1fe2f2357856b94a2b6fbe745b93aa. 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/QZTBC2488627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00be33e99ef9dcce3824f894889a6c69920d5a12a708596a4aa25a1b94ccac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7N2488089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4f4340f6bd16c4aa10897fce74ba177f9c53d36e25c8e8b032b87d61329545. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6J2560364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd203e5ceeb3778056ca671fd5dd7b62df088b61b2b4bef103e2bb7a4f464215b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:49:51Z), 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/QZK6J2560367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75339ec67a0859e7ff9db5ad3186bdbf626b5a5bb1264f7b329dd7b813865dff. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6M2598093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e43508fc216cef30d49ba544f5e4997f3de1f3f28a15c5731d8b61800cbddfe. 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/QZK6M2598094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412b7335bcee0b2150cd9eb6ea44b6713e72dcd332350d4cc33d7a23cecf24a9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAS2551149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fefad4f4ca69d19590a98e4e3418ac05b8aee5a7ac458db838b8277b314802. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:46:58Z), 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/QT3FB2528870.