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 0x41a4a2da344044e4b6df62987a248bb9bb89ef927412215509d5cbc89e34307b. 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/34d2ce8c-c696-4e1e-b0b3-554f92a03f83.json and https://artists.proofprofile.net/proofs/artist/34d2ce8c-c696-4e1e-b0b3-554f92a03f83.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 0x7a2c9b94c5927dd9075c47e707ca725e0fa3f53b968fe7b529315e2c3c79137c. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/NLPM11512195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e7a4bb2898cd591fd121f05f7d952fd264a68cdf615ec54e714067e72d54d5. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLPM11512196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe041d0e751025323f1f12736af6f22f6a717125f70b32d5813affd6504e3b395. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLPM11512197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb31df908ee61208843e9ce9e9e109452d9c1dae35524d9c6b4163e6e1464120. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLPM11512198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9963c27622faace87d3484da441cf36ab38471bf568a27780f83de59407fc3b5. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FR6V81974146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720bfca879abe7f92bd3a9d9bdaf591b5e2db9bab4bb6b0b1083e9bc78697a4e. 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/NLPM11403022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0cb0d2c5ff1a1cc8461f8623f8314277342d355f8efdbd68cda22717e8d584. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLPM11403023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebef45be1a9def59e53da28646c5a97626dac07a1ea8be2b3316157d903b7a9. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/NLPM11403024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c743bdbd0eb17b6f0b84b5347d06edd6300ea1c6c0bb237fe789ea0f108d17b. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/NLPM11512454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234aa3903035fb363f71b3cd6e0ced06f20ebe5ed82a2aa77ea3c0a84dcce6ce. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/NLPM11512455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8a99b7f685f851b2c96511454fa2c8a9f2c227bb9031ad375a1f5b32f6e799. 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/DEXC82100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a3faf463b1cefeb88912fd09e666e7aaac937da212b58168918f47304d5420. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/DEXC82100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a4e5bf1e6ae84d59e79cdb9f4e77bf3c3f757f7205889b8cad4f25802c7bb5. 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/FR9W12008411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e56f2d639a7c87de2a231aaa67e880424f59e83073e77d2d1673bcffdcb091. 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/FR9W12008408.