RBK may refer to: NYSE ticker symbol for Reebok sportswear company Robert Bosch Krankenhaus, a charitable hospital in Stuttgart, Germany Rockbank railway station, Melbourne Rosenborg BK (Rosenborg Bal
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 0x3aa588b1ec4b3035c933eac185a11b7e44a9ee7078d007cb06675c9075e45777. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f81a99db-ba89-4212-ba9d-90246e7949e2.json and https://artists.proofprofile.net/proofs/artist/f81a99db-ba89-4212-ba9d-90246e7949e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).