Bader is a German occupational surname derived from the German word "Bad" meaning "bath". It originally referred to the owners or attendants of bathhouses, who subsequently took on other tasks includi
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 0x31a10ebfeeadeaae49d88705eae74ae0f45b5927db60d399547b82d033bdd220. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f7998b8-6a5b-479c-98e3-2b584fbe73fa.json and https://artists.proofprofile.net/proofs/artist/0f7998b8-6a5b-479c-98e3-2b584fbe73fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).