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 0x38fd875535132b141964ec350e214b0533646a3a706251cc85b9c5e9c0797c69. 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/6369998b-1083-47c7-bfde-f43b1b77b4ed.json and https://artists.proofprofile.net/proofs/artist/6369998b-1083-47c7-bfde-f43b1b77b4ed.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 0x5e10df008019a23a5789fdc5fbbd5c83c13cfcc5d30abff8bd98cacc67367ee2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWS2452704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b17d17346293e8f0511d848002c8c0611c9f6fb282c087278c79e81ddb01cb. 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/QZRP42473806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82fd1263cf05220db50cba59ba9345470827a7a48adf32ea60fa813a1e3c4d2. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZTAZ2423035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b30dba205125ebeebc5d0d9ee6f2b1c1ec212879d5e70fab6f4efaa03fc80a. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZTAU2415850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1460024df201362749bb9632c37174a06ae6135c87d8de5cc28cc206e8ab98b8. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GBLLT2423331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbb7e8b46a9b99f7698cd7e0a1b8f556023e08424ce2e60e7ec0017059f9a26. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB22425145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7545fe057aae028ed4aeaa609039bef5e1e500d476f098c49588ec44994a1f0c. 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/QZTB22421625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e415655798128acb1b7516fdc79ad073da0dcceac92d456349cffc7f631a3b4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GBLLT2423752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671c169a88728e5dda36668061ac2636bbbdc55760a74a48a088a7c8a3901fa0. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZTB22485860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3b18349068d5d03062704eda589eb7c0a6e373d428eb954f9c8b8556e63273. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZTB22447716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e033096b20fa94321237fa893ce10ff1652c1f890de4cf447b52e81c92982f2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTB22448299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1654b2232bbcfbf0ceb23dcb786a284db2b201bb3b59d05fe469bdb45d561285. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GBLLT2423766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4988c0a565a647ddfe044bbc2bad2a06ab2900525c94d962765cd878cac423ae. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/GBLLT2423767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136cdedea3ade7bfa4cf857381c87afcbe50f7bc2a4276952820fa8a087aea3b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFM2480475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4982551eea119cb5b5c15920b601bd32cc10871a831acc1b6d76735dd72ee332. 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/QZWFP2457336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfba0b3221996d6f65bc4564b42d2242f413a2a30dd02f21320f3e77816f63a2. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZZ762452621.