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 0x980e4b3f40a6e543d15ececa6c2cb951dcebb3fa63c447901f6c4e09f50ad826. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55796d0b-0948-4d69-ad85-16839c0d1f9d.json and https://artists.proofprofile.net/proofs/artist/55796d0b-0948-4d69-ad85-16839c0d1f9d.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 0x6faf85df5654fd76442e5d191941f9c816ddc40696f40f82343510a415e671f7. 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/QZZ7N2434104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc207d45d14a5b9cb4aafeaf4a82c2bc75d73ce63d8f7a9c77711546f4c78e368. 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/CAENV1819459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cd2e51c764dc69e6a990574419b806a1d6d4a7fc4c27f5e5243567ba74a82c. 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/QZFYY2162142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798173a3783955c7356b74bff76302b9867f18764d70d2d9612ffb9a4c630a82. 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/QZZ7N2434105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9537af5a86944553544df99e83cc18a68f253640bf5bcdf555753a2b1d75bb39. 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/QZZ7N2434106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692adc819b86cb689dbca7f08b4ad04083b2c85323b8e69ca9ff1e8c6f19f499. 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/QZZ7N2434107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb0f34e59f1f159a0c0d40845a8f5e7c254132364d4819a725e3cb6597c5534. 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/CAENV1828898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ff049f9485abd19ea00378b39709d843bb7e4010bb8f8e2650e2337703576. 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/QZZ7N2434108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb88f4d938a80232f864f9bad5265cf269b3bc652f2aeff042cf4055ade3ded4e. 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/QZTB22332250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491a9baaa4e2eb7a694616a01503a7c6b4cdf56ad069000495b2bd8ea5f470e4. 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/QZZ7N2434109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae7574891cc8b255d28bcbcbff5b9e18f9e126fc04f1c18d615a54c1f39a55d. 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/QZZ7N2434110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfc49a382343785680ed0520b1f3b85c1938d85584c0a3b6fe0c5dede05f281. 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/QZZ7N2434111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2863416d5354091b9a67cd230b297e81ea254ad80ea4315fe4109314b5816e. 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/QZZ7N2434112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594728186ebfe0675ab6f1c31edbb6774d7a337e4273236697425d065110115b. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZZ7N2434113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc025ba73565a3f815c42f90050ca6b383637f70f21e1d11cd794591f72f5923b. 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/QZZ7N2434115.