Brooklyn is the most populous of the five boroughs of New York City, coextensive with Kings County, in the U.S. state of New York. Located at the westernmost end of Long Island and formerly an indepen
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 0x5d69d29d73f045783e03cfb73525ab1952388b8640f00fa1bc8399a9f487a8e0. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3e2b548-bb51-4451-92d5-b25a82d29d86.json and https://artists.proofprofile.net/proofs/artist/c3e2b548-bb51-4451-92d5-b25a82d29d86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).