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 0x909a34348221b130e34cdaa8e6f054f7d09d2701b94f41a243c5286feaafc992. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fee6f69-16d6-4552-bacf-ed1601842023.json and https://artists.proofprofile.net/proofs/artist/2fee6f69-16d6-4552-bacf-ed1601842023.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 0x7966184ecc9844487ed2fd12eb4f098465779bf7408e85fa0a9f9c179c24cfaf. 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/QZNWT2158857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cc3b8480ae374879bdb07516a09a0047ba92253ce12f4e77b57a1de84d3a90. 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/QZMEP2162380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23886fd1841bea71cbd23918970bf1e174857c83bd1f0f7abb882f91820c49d8. 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/QZFZ72209657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bb1d1732b20a3da2923468de35516220acfab52d2fc0c1a75e16615d3b1def. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/QZHN62299698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f18d8bab9460b1f0b06b5830201756fdcbe1052cf411fcbdbd5975d34894661. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAS2138365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe1ffdce51f14aa31db2f2c46ce07be654629719adc2fac906592863249a6ad. 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/QZHNC2333790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49e09903b4f22cf359f081f43d80f3946a42e6cd52f99281186b9a7674856f1. 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/QZHNC2333791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f7d904791417f4040db41ee9464c92e898a71681ba4475c2605f216fb0a704. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZFYX2461874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a983dbf888edf8ec0558a0366e4a160df21727dc0442244db2b0e1a1a2d035. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFYX2461875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41c96e56812c59dfd8a2173b5ea30e2977dc3568bb2405c44e592520ab34e03. 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/QZK6G2364361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bb1d1732b20a3da2923468de35516220acfab52d2fc0c1a75e16615d3b1def. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZHN62299698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f18d8bab9460b1f0b06b5830201756fdcbe1052cf411fcbdbd5975d34894661. 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/QZTAS2138365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cc3b8480ae374879bdb07516a09a0047ba92253ce12f4e77b57a1de84d3a90. 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/QZMEP2162380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2aec4b434efa4bb529a43b630b4b265a0117ee65d6e64b634bec6c23e8ff7b. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/QZES91991307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb869ab2741b332daf31e2adfeaf89c1d43c1463333443465045860e6b0c2d31e. 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/QZES91991308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ed7f840d8967e6e47510b9d9031367177041a6b1eba149ff2113a400a13f20. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZES71943754.