BD, Bd or bd may refer to: In arts and entertainment B. D. (Doonesbury), a major character in the Doonesbury comic strip Bande dessinée (or "bédé"), a French term for comics Bass drum, in sheet
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf504dfadcdb61b8c64d8ab9fb33a49cb09626f8deb001c72ba24c22f5d6c4f. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aeff5369-466c-4d02-9384-b5b24490c948.json and https://artists.proofprofile.net/proofs/artist/aeff5369-466c-4d02-9384-b5b24490c948.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).