Tanzer or Tänzer is a surname; Tänzer meaning "dancer" in German. Notable people with the surname include: Andreas Tanzer (born 1989), German ice hockey player Jacob Tanzer (1935–2018), American at
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 0xb2887417f09632db946c7eeaf0f4447c486ea7f02bd811e823bc627bc15bc20f. Chain 2 (Bitcoin): anchored in block 953681 (2026-06-14T19:31:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63d77644-7986-4b9e-85a7-bf30457cf120.json and https://artists.proofprofile.net/proofs/artist/63d77644-7986-4b9e-85a7-bf30457cf120.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).