thumb|250px|KrAZ-6140TE semi-trailer truck (left) and KrAZ-65032 dump truck (right) at a 2006 show KrAZ (, Kremenchutskyi Avtomobilnyi Zavod, Kremenchuk Automobile Plant, also , AvtoKrAZ) is a factory
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 0xd33e7435fd5ea9e02cd32e7f9e3a751e727869957c70f21b69f2d66595fcde26. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c087ad74-9bec-4275-90b1-a1958373bd6a.json and https://artists.proofprofile.net/proofs/artist/c087ad74-9bec-4275-90b1-a1958373bd6a.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 0xaa85e480b8fc19118f9279c238f9538e93a213edf35b50984cf8a3dcfd4e9faa. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USA2P1941520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4896b755f8e1c7efdca74143c02de89961aa2558d21fbe4b64879658dec9f2ef. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USA2P1929980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0528403440cc614862582b3241a621358daf0cc1506f1f488b4b2cb984a045b9. 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/USA2P1944680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7375d267c0f313fa8d157113c3425f5ab91ccb4ba0cbd8fcfbf494f3de2a2ab5. 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/USA2P1944681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5192a975123fd90f04747dc061db897839a9f971934a9d3c1d67f7fc9fb68d4. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USA2P1944682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe174ff187f278c02bfb18e4991d1c95d60c06c8c50217e6b7c67fb4a31cb6112. 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/USA2P1938026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa85e480b8fc19118f9279c238f9538e93a213edf35b50984cf8a3dcfd4e9faa. 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/USA2P1941520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b90ad483ccf7aa7d2e30db0b7c6a4c99ebe4aa283f2aea02ae1de7fa36992ed. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USA2P1944683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f793fe2328b469d1c014f5f58aa45df4c0adaa5277be5216b4ab6a9369e26a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USA2P1944684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860b88d7cbf1cded628fcef7029b048f7da86b542774bcce43e06800524189e8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USA2P1944685.