BDK may refer to: Big Daddy Kane, an American rapper. Black Disciple Killer, term popularized by Lil JoJo in his song 3HunnaK Bruderschaft des Kreuzes, a professional wrestling stable in Chikara Buduk
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 0xc1244c3569cee504d2d1cf97241100e25bf88e0d16ed00d05e28288b6520093b. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4a5e6eb-f17b-4eaa-8bda-35c3bde2b44b.json and https://artists.proofprofile.net/proofs/artist/f4a5e6eb-f17b-4eaa-8bda-35c3bde2b44b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).