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 0x5547cb6c0f0e6c7d426cfb42909d0c2f18b6a10069e469c2bb87dc2886808f4c. 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/8672f4a4-dc23-49e6-b863-d39f2402f801.json and https://artists.proofprofile.net/proofs/artist/8672f4a4-dc23-49e6-b863-d39f2402f801.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 0x70650f7bfe4470ecbbe0d08d6803faf663994c7da4fa00ca82d38a7a65ed7146. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/DEZC62053729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd0c0b33c8951395118d08ca9ab9a089b9d32e09b173393bc80f1a708f17189. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEZC62106447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16cb002498fd10e60a8607ced3bcdba0dee2d0ef1f94ee9770448bf738b0230. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZTAX2205606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676b2da4e9cdfab64b1b67f759347c7de9dba1226b9d0f80daf4bf4bf9c9f877. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/DEZC62215616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5761603e4651db7fc7c591a354690d49e7b99f74f4e2207845ee07c6d4c99957. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DEZC62215617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9daaf7f379745ad0fc071d06ae03e6f082a1a27fe8969f80260f4bc18c0369ba. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/DEZC62337402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7a1467f0667b16d738d1c922d0cca9a1973608689e3ecc12ace18c16753f55. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DEZC62340299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d35f7c74bc5c5b3e9d2859b643e0f56b024c6c29cf9fc8d46207435c39bcd42. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DEZC62348988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506a1119f7ff6a7919b3f0c3ede5e8500c95d802602c764fa4e640e588334c7c. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/DEZC62498821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d8882f376289e2a4c1465f68e4e781f0328024a5f6636b7691b9cac4329793. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEZC62407877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187746b32c3fa74e762abbca2b6370044bc84e40b5eb8e510646146aa4bb7dcd. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEZC62415896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf29106a568f046536fb1ecff0fd3c931209962122783c494104676d2261486d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEZC62418355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187746b32c3fa74e762abbca2b6370044bc84e40b5eb8e510646146aa4bb7dcd. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DEZC62415896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bcb61ada43c657e1957babb89f7b30bfab100352cf368bc12cb6bd2a2bd0bf8. 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/DEZC62418356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ec2c235c8d9c4992101cf34b2c5f459f93f67dec029f5f09b21fd847a16a96. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEZC62434695.