Frobel, Fröbel, or Froebel may refer to: People Doug Frobel (born 1959), major league baseball player Friedrich Fröbel (1782–1852), German (Thuringian) pedagogue who laid the foundation for modern
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 0x6f21e64add9d166420e26c7b051688fddc965e727c11608e8a855c65cfc544cf. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/721ebc6b-3b10-4935-b541-2a3c7b994485.json and https://artists.proofprofile.net/proofs/artist/721ebc6b-3b10-4935-b541-2a3c7b994485.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).