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 0x32adf7ff7c8dc9af86f5480a0b196e1e20153c399d66e6dcc3d12af2c71de725. 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/36a990a0-debf-4321-90a1-1412d80383bb.json and https://artists.proofprofile.net/proofs/artist/36a990a0-debf-4321-90a1-1412d80383bb.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 0xf0c983243ad85264743e4129ef23c6c991d5269a0fc931782149c615ee403f16. 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/EEMI11900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e72d65430b1ec4148be1267adf21cb287b915a5c97506c8f4c1e2410d2407b. 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/EEAI12300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ae2b7b7b67647fed4cb061fcf7e406226b70ac5c9758ffd46a8e6cd5ebb296. 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/EEAI12300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3639103657ffcc55e234d143e04a87d13b52b3b88ec34bfc9bceb13e83172eff. 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/EEAI12300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e0fdd821f9665d41fc728728fde001dc5404fb937e2009d61154cc467c9473. 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/EEAI12300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602dc999cc6e161f4c3487f480e75a157424aa6ff5e3b39152bc7133bdcfa54b. 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/EEAI12300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc7aad8b36ba3fbe7566a143fbcaf0fd21050f24ac97c36d1a9c28793925e64. 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/EEIA11400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e6dcbcc29ec364a86c8a1383cc426a84a777d32ed0dd8b05e6142ca5a02b4b. 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/EEIA11000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84117ff5bc90aadefd7370527d6b79f9c64c6c4befcc0ed0870e41de43c7641. 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/EEIA11000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf76b238cb2147e8cb091e9e3bab36c5fffabff9c758c9f0983419d2fb2cfe92. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:02:29Z), 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/EEAI12300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d31831e9f5568c94ca0e7be47e3a0fc6baaccb530b194c3e59e7254a911b2b. 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/EEAI12300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ba1d3d0c0ef42b09a196969080d254f6d6905f770eb12466ae54e56b7e0ff6. 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/EEAI12200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931ac5c9a5259fe5e4312be0e1dfced1cb62ac34c271ba48f622613fb7d65ad1. 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/EEAI12100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468d06f92bd72515971b30b12efbe5f393d4fdf742068725660bb3d88548166e. 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/EEIA11700001.