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 0x087831c9987cc4873638c6e17e06171214d15421280e91371c390da0bfb9f75c. 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/2abd4422-4036-41e2-b0b8-d5432ff320d0.json and https://artists.proofprofile.net/proofs/artist/2abd4422-4036-41e2-b0b8-d5432ff320d0.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 0xce238c6e891d7f12710078e167906555707f760de47278289331bb3d0c2340d5. 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/AUV401108394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac56cb86c661757530a4a99695595558939cc5eedf8b2e7367ce039a651e3bfa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/AUV401108395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0445f9b96121c9b42502fddcdab234d6d7a13cb7ed45aa88aa490b9f6ba1f3e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/AUV401108396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fa45c46d0ef1be7fdef5f382f60d294e3fc0ec3a6104639386333e812ff1eb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/AUV401108397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780c016079ee92f307853ddce3c9795a74d4a442bc830378ce9b8837795e41f2. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/AUV401108398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0346b6df63f06a8a44cfdce94b0064c6d548eb6a8a7fea73af8568ebc6e63875. 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/AUV401108402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc4600bfe8a7b5d179f73ddeeb2b9e3945652d2a6f0b2b5c44fd0afea43bf30. 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/PHU011515004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1ad102d368d9db2cf97f26d04eea58dbaef337d334c111a7c6a8e5239b4364. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/USHM21310872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7152792dae30b58198d9a519b8df485ac33fb18f3dbfdbf8562555280017bd26. 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/USHM21310874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2376da10cf04c8a259aabcb073a9fc157e5e3f4e21ca3216f25223b2f3bf832. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USHM21575591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f8ab2235ee42ff529ad3b56199de9740f6824f2f16755d75f089da0a613422. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USEVG2000019.