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 0x81031e853d8e1bb3a638cf2c117cc876aacc22bc92ed97eaededb8701c01e56c. 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/3c6f5db8-62ea-41d8-91b9-ea7b2d28cc36.json and https://artists.proofprofile.net/proofs/artist/3c6f5db8-62ea-41d8-91b9-ea7b2d28cc36.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 0xe9d4f404e6bf6ae4bcbc397acd1d61184f09801b63e9278532dc8f7533d9a6bb. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTAS2352427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e694e5b822929effb2c48b7834ce65b6dd9cfc66f11ee8c26edee62fa8a15ab. 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/QZTAT2323544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c3bca4d54f932fb76a47c40ee1384f9a4e9e968f2a3f348ff88457b1aa596e. 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/QZTAT2322770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa7bb3e32ac0f47e59979b9e30df9dbecd0419405ddfa5475c47f3031863702. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAT2322771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3799da7dba9570d19028cc3a1d1b455f7b32b5bc821184a4a8bda9053cb1632. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTAT2322772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f790a6f5d460e3d85714853a110f6e97c7202201f5f6296c92ba3ff1e4916a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAT2321997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4a1152523f721beb6c20dd452faf8f02855c683a960bd85912e4c37175861e. 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/QZTAT2322785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceb6afa99f150846177deee11b79db22920f502e5653f2a035243771b7a69ef. 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/QZTAT2322787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf2b26d68265da06d616b2f80a6356df4ded15c7215482ba85ec5bf2d340eb4. 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/QZTAT2322788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600064c5a5c0825006bff7608a3b867fdacd57f74ff431b0817c8d9e26c6df1e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAT2322789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b6c400269b3d0b6c15724446af41c6c00b9c782f0ee0fa3b7f420eda553933. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTAT2322794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d23e3093acc3d5b815363f4f4f32e95f9d638e9b2b728562f62a8f2ebc8079. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTAT2322796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c97a4fbb0e5cecd857026e265832efa66ea457a31eb8dde5fc3f47ae16e85fe. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEP2423197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddedf77dc0a1dd88bf2015196f2191b74b49d10a6199143ac7bf443f66589c7. 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/QZMEP2417397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7a582c4c0f56609f2a34edce4dd0f557b6740ee388e76b8de80751fe19f574. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEP2417400.