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 0xbff8a57c1ca9af752e06821e3fdee95be45e5dad7607ab75edddd2b2e5fff4d5. Chain 2 (Bitcoin): anchored in block 953939 (2026-06-16T11:40:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/210a604e-8e45-48c0-8d16-4f3f5d49eeda.json and https://artists.proofprofile.net/proofs/artist/210a604e-8e45-48c0-8d16-4f3f5d49eeda.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 0x4673ba2dcd833bdb6c4d05c5ea9df32755e5a16b78e553079752a38b52ae7b9a. 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/QZNWZ2542685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73aa931e2b928b0486ae232e70a518c64313c8d112efcda5c1fea9b61f6cd93. 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/QZRP52530501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb69f7505d50c1fabfbab36e3e67ef34acb8af7619fc2453213dae690088805f. 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/QZWFF2511995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5c7aee6951b903f0c4e2c07e7b55097dc94180f411cf52d141523ad6e235e8. 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/QZWFR2565141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77b035486201cabfc127fd9dff1793e21494e8fddc6baee4dfb326eaea0e847. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7M2575165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14abaf9242834a65f6f71ce2dedb486bb886a204c5a28d7882d9807e92d3b32c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7N2528293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c2602feaef7a97c389375e4187590c41191949972033b60d991c8a6ecd96bb. 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/QZZ7Q2592122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff1323df15a5b32bf0cd13a9084c9e5d0d6f35c0a6e54ecf629789e2817c9ab. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ7X2534704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061ec17c3af68825e013e9deb3921a3c889fae523ffb50438311ba7088eaad94. 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/QZZ7X2540796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bef8aecf6dcb613f17fc21b21dc7ddec5b0926a8fa056dee1674b0a40ca367. 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/QT3EX2540946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd032a0c8f22f4c762533332fa2233baae5d5764e30541fcc5734c9874f4be. 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/QT3EY2561392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e2827cfe18a32f5e0ba091d3aecb1006f9e6ada4eff218cc2ba02a57074e59. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QT3FG2547466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ff566e19ac34a7761177243d36a95f74365033e8132d8f7b3d79fb6194db7c. 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/QT6E82567741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3520ed9a3dcb7bad56bbc2b793d4975ff71d07b9063ecda4891c12aaae838d7. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QT6EC2549684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3d54c85af869f76ca3170c88532aafc9204203efb4135299649f8cfd12c180. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QT6EC2530390.