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 0x10ce081bf1be36ed647713290742bc1c72f5145ff18c1c64dbaff8461d8c59a6. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67d4f080-0e30-44d1-a3f3-fdbdb233c09f.json and https://artists.proofprofile.net/proofs/artist/67d4f080-0e30-44d1-a3f3-fdbdb233c09f.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 0x02ae5f219df085b1e1f906e272c971b12d5bf04351f9728acf50cb464421f758. 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/GBRKQ2471394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe109b09119b608b319330c8038797fd433153096b79543cb4aa50cdb4155fac9. 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/USCGH2494911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f88e816262b55bbfd5a344cc6b5b84413bb4cab7aff763998f92cc86484442f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM22348693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b68e6a3648b461b72de9c58a410671a3af88d2fcc3562610c4451c828bb8bb7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USDY42343942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643d20af8a816c93ec8d73dc7650d374dfd43c5985aa938c912defd183ffcca7. 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/QZ5FN2380740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bcef671e16d43fd1f967d398e622f290e996ffd06d03edd217c904af59354e. 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/USCGJ2472706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f686b9770eff98a35d98a9c2fd40f87f975575b4f0ebcad2e8e0ab66b515e27. 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/USL4R2309368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623b4ec4aea430b8454da306d91c21b72a58669b1d112fd95325cc4c713ff138. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USMH92351989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c141ef4cb26b0f3b564e4144ecd179803d4cc83d7d5ebc0e827c1b2847b697. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM82498050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70fa3beaa0eb4fd9bfa33d5af56a02df5973694971a24e31729c74bd1182468c. 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/USHM22495885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697566d71fb0ade066b5a679d5933f258c1c4c1979d7c2bd3a2f05ff352c6b66. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USDY42411241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edab56231049f7dd423532355c4f92be6742944c31ac12507c8b64243d998c2. 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/USCGH2472144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2f16ec534eac88b549277b29bf7112ec8832ac3e03a055b5d6e260db86b26c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USCGH2472147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9e641d904ff0e43bcaeaffcafb476b610a80c00557ab7f4590fce4ed3745b2. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/USHM82349799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadeec29a8f0123aaf08317b84dc3a7674671a71c41173465b5000cefa07e03cb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USHM82338248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d15b2c3724d8709fbee1c98efcae3b705ad56948668840292a1e3c4c13eb905. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USCGH2365257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f772376c642bc2bbe86312383a4f2c9d9ec712b265167938cbf237746ece01. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH2329056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283c31ec7354fb2d52637256ecde627e85ed57c6badf91ae028366882264d289. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZZ8B2310285.