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 0x525d6dceb084a67e8c7bdfde698b78aa605fe0ea6dba8b822ee6ded81cfddc0e. 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/0d4882a0-e598-4e42-a5b7-2824f82261a7.json and https://artists.proofprofile.net/proofs/artist/0d4882a0-e598-4e42-a5b7-2824f82261a7.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 0xa6089233d38829a65d683a921e9d30d764cf3af6886ce7151d911bdb1555e390. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYY2112703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255b442a90d103ec0d37b84812b1dbf1d98b5981d91d2e296a941d902532fdd3. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZFYY2112704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddc9744030c12d8f6a557663379e5ac15731b62f9b1c7937148bd5811fc29f3. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:55:33Z), 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/QZFYY2112705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b557ba196a60a5cae09608507e701551599ce7602ee7036ac5352a328e4aa7d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:00:22Z), 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/NLM971900154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401b38887e03800f7958d56d4bd8e22cc3f9e4ff1240d5da818ff0fd020901dc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNWQ2017975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5170826a37802c19aebc2fc31c151a741e827fac3fca86a81632cec227e15e. 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/QZNWQ2017976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcd55a9168965f46ec12f6bf761f7725d5750545de9ea01e153c953fbcf16ed. 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/QZNWQ2017977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc502545294b5be73423fbb566e3e85af76ee8655674a2717bc59b2b555f76acf. 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/USYBL2102219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9cdaeaafd6add0f684ad9c29d533942d602f29c72715657a6033f5db151133. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USYBL2102220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0844ca367e4638187d08f41a2e5de68b91052b3b617f621bf9e377f424ce415. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USYBL2102224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790c00bf4b08e719976d0dbfabf20eafa2b9db8cec9a44438bd11111288c3fc8. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:34:26Z), 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/USYBL2102217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819ccf77d6f954d9de17909b579a67a1e5ca7121fb3cbad5658766df6b23ff27. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:28:37Z), 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/QZDA52413033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16de7a04db080be6613bfa08d03f543b3d7be0a5d88dcb05b54e50b9e1fc837. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:15:00Z), 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/QZDA52413034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe397ad6cb46b74604e07bc3da784560f69ff12afb0abd6f97f6bb93159df1917. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZDA52413035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda169fdd2b3e2830c0daa09e563e895477786bbe1da63563c0619679d37eb13. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZDA52413037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a0533e54ff52fc11be8a2e6d8adbefa982a75c10831eb12774478606d228c8. 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/DEY472377631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc37e1a30dabcb5e8a396f6c01d14f6872ddb3b215015c86999aa3c64738ca73. 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/DEY472172788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588631c13c10b8aa6f2f237ab4e56c382fc1b5c36074c2ee89205c0e85f0c7de. 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/NLM792300199.