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 0x0305eae1d775d392c9088f49ed561e0d6a75c122e609bf8240401c7c78e42f47. 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/0452ec97-a45f-4181-9d21-cf76c19f4fd9.json and https://artists.proofprofile.net/proofs/artist/0452ec97-a45f-4181-9d21-cf76c19f4fd9.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 0x76037bbe8b6a24eb79d90592e782232928214b6d79c1fd3845f267cb008cd536. 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/ITZB51810193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda27c3066111207b041004f6cc912831cce0c95550a152a60d0cdbd5f78af389. 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/ITC471720001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71190c2a79d16d7be956e231743a6b43a94231eca7eb13485dadd9b4becce18. 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/ITC471720005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692d3fdc3c09db796e1e375992a38b919ce0823c7f42847f6bcf3c7318cffb23. 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/ITC471720006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc903478963c6bbced31c63b196a18c83945a47c6c62e60857e6a694df81303c8. 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/ITC471720007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2f9b0899acdf09c231ca325d168a6b111544f539732f99efa504765ac78fcc. 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/ITC471720009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abd1f444a14b77563999cd0b36de38b8e1f27c7403891f7fe91079164ece8e5. 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/ITC471720016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccf1245f953827b636e33cdaafb35cbacc7adb018d3fcf26f2c389af6ac2bae. 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/QZFZ32037949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205a64efa1524b18ffbcc14c27327dba35bba2eb004fbfb1a20422a22b46e57c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ITC471520260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc01de0a780a854014e6397a61e99e667bb9af410ea835175b96e4e6aa01e6cd. 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/ITC471520265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344ca8c704f0e6b41ef6a25c84b7ef3e5de1bd5f79641b78c0e578b797be0133. 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/QZHN92560902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d42f3cc4ded6c2600f5bb9f5b887012f82f6974fcfe8499f47cacd5d46596a4. 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/QZHN92560903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fecdeccd2d5b5fe43f6e6403105bc3fa664ac14807865200f7a3e01299790c7. 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/QZHN92560904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9139e269a6e97aa81ae626defe0fa42bd02d062d4a4a943b70acc89899920532. 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/QZHN92560905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdfab6d47fa8b42fc910a589da4b76edaf9408933ed580c958328c106d066a8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN92560906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1db2749e01670d8a509af499304119844ff3683836fc61506f7701cfef7579. 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/QZHN92560907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2faeb01fcfb766c3a88214305e91ae383438313d6860c6b7fb927a26824a89e. 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/QZHN92560908.