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 0x7256e38d7979b4afbf5de00dd7e090f26c1223555d4f7a3ef20cc35199a34505. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca4f0063-55ae-4a96-8a6f-b475fb0238ad.json and https://artists.proofprofile.net/proofs/artist/ca4f0063-55ae-4a96-8a6f-b475fb0238ad.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 0xcd7b08e07e8c25a94f2b3aed57ab8b64e0847222610d2ec22a88b9a3c67c8be1. 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/QZRP52344188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d936b732c6f24252266fb2a105979063b6dc8308530ecf1b2afcbfe6c5b478c. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFG2363522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d0be5fd370b1dcee10c74e5dc86582bc4b241f7771801e52014e6f7734d721. 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/QZFZ32499223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b524bdb2cf00df2f62c04f28b1ed4b74a4372fd36e2bf56918c80e2fb0bac17. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA52490676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b524bdb2cf00df2f62c04f28b1ed4b74a4372fd36e2bf56918c80e2fb0bac17. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZDA52490676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a74b64ecc5f395a71e963f0f006d4ffde239a46e69657bdbf8e40309473c834. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZMEM2415962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a74b64ecc5f395a71e963f0f006d4ffde239a46e69657bdbf8e40309473c834. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMEM2415962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf008a59cbf51ce987dafb0441ff2e6f081cb4be2af8d3d8f9c6ddbe8be2dd388. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWZ2485799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32b647d6423f8ea1076e633457eef02d816848119318d95fe0fd591caaeb080. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFH2459726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32b647d6423f8ea1076e633457eef02d816848119318d95fe0fd591caaeb080. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFH2459726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfda96f7e586bacf6eb6accc19e882f28da1292cda65e891bafcaf5b18b8453. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFX2410937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cfbfe67509d25defbae0c8984591b6250b0200afe637cfe74b43033e940cfa. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3EZ2426813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af400de5926574a5f74a39c01f7a0de6eafc521075c1d0e7f4ec760f9bc641c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZDA82514517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06244ac8c0307bb4d527cd2b1250cdde0f679a2a69d16da42cc7fbe398683f67. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZK6Q2531704.