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 0xb570229916d178ffdbaacb6ece286026ca239199ed2109f1c626b54a5330730d. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b708562-9b86-4cf1-aab5-b3fbfd8d0302.json and https://artists.proofprofile.net/proofs/artist/0b708562-9b86-4cf1-aab5-b3fbfd8d0302.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 0xff92b7c69330388ca7963dca718e7c1bff388692197daf8c0e609b7d4f7d4b18. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/USLQZ0800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07abc238b7ee982adb2b64ef0cc5718c4fbe77ea0f56c146b5231fd8bef5b0a. 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/USLQZ0800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7303ea94882b38c03612ac08c7468086d5c152ed4890ebc94a930f94e4b54b. 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/USLQZ0800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25700970888ea01cecd82afbf89e5721e07d2b00f763a485a79c686680cdec50. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/USLQZ0800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3758a996f7f372085c6132b2f59f4af006be6c67d341a1f950a667304a2306. 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/USLQZ0800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad23e1c2ee5878723c41d8490e855fb358224e59dc58985d277c14977a088e2. 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/USLQZ0800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548139561af4d4035b45e49a2ee86889d6ba7db4df61e108b7d97e5139af552f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USLQZ0800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8e5339d86a9ad8818ab7ef4a4f37285ac218a6e4c768232639a24f15fe445a. 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/USLQZ0800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ed6c9117112b8ce448826019c18cc994526b586c9f9f87e9860da528bc1a79. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USLQZ0800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5062a11a43ddde81caf04c1a4b3bd75ea657d6dcbe299c43b27ba95c5e123e9. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USLQZ0800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b211baac10254891b156c6311d72b95fd12682bc5d057ea514a12dea95f4ae. 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/USLQZ0800032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c10917efabefa2df74e5000976a4fde8f45705ff4203096809313265ea666de. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USLQZ0800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55de32c8db253eb28779b463048002422f033ba5c2ec32732c8f04637fd85a14. 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/USLQZ0800036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0733b18272661b32873015397f02f0223abb80272c2982f807c86e91762d76. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USLQZ1402149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46847ea573b5f0135092449bd04b9763103949d56e586801b5f4030982e3773. 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/USLQZ1402150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286addd8fb60b06452abb0362d2c570472715d00f04878f4ecb96c0cbf733806. 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/USLQZ1402153.