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 0x7cd4b23995119cffe0621c1314eee5d6aa5de6551ae7154fb32bebe6457887c7. 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/83d8505f-ad27-412a-904b-3a2455f09588.json and https://artists.proofprofile.net/proofs/artist/83d8505f-ad27-412a-904b-3a2455f09588.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 0x1c3d084ce1ef786ea3cb8a77e249397a54a340bcc173114a30c7d7009fa8e097. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZNMU2359315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb351e20e1b25704ed9f71efbabb98cbeab9122746fa45b9312920c0dd03c21. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZNN22326999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76407b423e3172652a8f9dcba07f43f3cd5ff967a0ecf41cfb1c0d964237ee02. 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/QZLL92421720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfdaa868557dd22f6763da8303de581f9173ab1640a7a392c21c86846fcbce7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEV2423932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2096f7471a81fe7fb8d44a346b8c52da17734db4ac2058be1226410ee93f13bc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZMEV2423933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c8826d948c2e0bd9dd40d34d14465726f9c20b7fc8efe29a6492c2cc4dea0d. 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/QZMEV2423935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46aa235d45f5846fa78dca183b8afab3d9fb4b9ad419c3fd4d3afe18781613b. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZMEV2423938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c1a347981b13130ea7703d98023edc4f7ebbcebffa33212f04894fdec04d70. 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/QZMEV2423939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0089c53aaedcc32fe6ca969fcf9da8b4303769bfb2783f3323f1078108c42ec7. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZMEV2423942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb161d13bc833e178cf2e3528acc44142bbfbb2719351baa972dcb2ea4880c6b1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNB82418088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22cf9051b09ab8723eb74a1b3ca0a5cbed90a5192cf9b95593cb96df31680c86. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNMU2449879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c494af044fe5f614480631a708b4f0a8ecb9e282f7c27642dee504f5d6b1bc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNMU2449880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ba8eccc9fce90a5f6c0792493c47a8886f2b757a3d544ee8408549741429b6. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZNMU2449882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f17e8ae8e3289f39a3c6f4c9eaeb156ba9f30e260db608eea232d607669aa38. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZNMU2449883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b51e235a60b3db9afb0306d2ef078206570e07c99079018b640668315656c5. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZNMU2449885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaae23dc0967a9eb33b5972228ef51479afd9ffac7d19dbe439580a2f114dabf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNMU2449886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdaa9770270793600b575b8c897c55eadec37d6279f284bd142e55f9362c744. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZDA62337159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc340b4859f3193603a96794c54efef36b564fa9c756b79cbbc576f2c2c0c00. 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/QZDA62337170.