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 0x2b36b7e7d685c00af28f2e3eba6f37f6883d11dbfdac9f20a7b5dd4a6d1df13e. 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/b36be0ae-eceb-45fb-8c4c-f1495af5a14d.json and https://artists.proofprofile.net/proofs/artist/b36be0ae-eceb-45fb-8c4c-f1495af5a14d.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 0xa5a2411bac267360006761d0660eff6173853fc449795a7efeddb9018d858bc8. 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/GBSMU3997782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cbf1011eb6ec3cbd52ddad1b1feb05ffbd0175520e9b18393c6efb5cb03fcd. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GBSMU3997783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b07d006b6131e69c5b65206e1e3417e7c7d6fd1cd9f611da52556eda174ae61. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T05:31:28Z), 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/GBSMU3997785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21974cfc09e1a1d3acd6eddbaf67585d767ad0fd65a23dca665b614dc6259d8. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/GBSMU3997786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165bc30a465459d15620e6455c2b1b376ae98b2485c8b8f1eef95c208189eb05. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GBSMU3997787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82be65f592844f9721466f415a32d393d25bcb08148b85135125514b929be38. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:06:18Z), 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/TCADQ1863075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3081bb0ce234684f5197cb964412df0ca529736ae22569c677efa2cb286dc0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBKPL1969985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8086c5dec73b14161ad0c9cf5efefdc4dfb15dc9773ee3ff7f7a002a8f7f0ebf. 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/GBKPL2292389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28071b19226a01f1c6fa75ed59df698eaba654912c37694e73a3290d722396d3. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:28:11Z), 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/GBKPL2202564.