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 0x798b4e6ff08dad136e7b4f255b29264cc19debbd47fdf4cb88bf5b998cde50eb. 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/37a0a814-146b-490b-ad2e-b367d23a97c4.json and https://artists.proofprofile.net/proofs/artist/37a0a814-146b-490b-ad2e-b367d23a97c4.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 0xcf66f19d0828fafc92cb97db23f55915c6da0b1cbdbd3fbf49b041de532c60aa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2476624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ec55367bf0bb39730eaff6494383d069e3587e18ad48e103cf616856c884cb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAJD2457477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0587cc75a75ba6c00c5b149283db0491797ed34d21c53098ccc8dca5a25e6b95. 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/QZWFW2466120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa3f5b97619bc65cf97546302d84b6bdb0d377ae724f17635d80e5173955f14. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWX2452402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7775aaa7eb473027f5e6414020c10b0e27ee882224f7ab3d25f30ad8636072eb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6L2491134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c9805b06e0cb9ef9ab62235f05ffbca1f7d717552695d640980fd25955dddd. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHNC2409262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fedd0f2cd25bd34a10b55876eeb5c88a21a33dbd4e25cdc20752c9250e187c. 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/QZFYX2486775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd12680dce5206af5ce1da83c83852c9f7adab136acf08b3dcfec3ca86031af4. 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/QZWFM2308816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b6d48ce252020b8d6f88d41c4f5cc2d487c17301b1082580a189407777d08f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTBD2385341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd15fe9660fb38bf0de8747ae5286b4b6b75c908e366969db5fe17a75804cbb. 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/QZFYZ2386419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9d5d53d085fecaef96bee887cd432dcf2dc3f7f3a2734ef81b352e5199c134. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ72311830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eefba3e0cea69d2358e1b3480a968055ced4cd3111b92acc4cf3cbbffb2779b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ72311816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471f5a8c0db317d006936ec049fbe73bbf249f1f6b99db82a1891ea565b0f714. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZFZ22282138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcade61d5cfdb922e0efbb3054f5da678e5d5309416c872d2a9955fbd6b98e19e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFF2459430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a837bed3c1f5c6f8f5aa86d0f2c1a491376b8e482071104d37d3fb55c0fda3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES82492644.