Park Slope is a neighborhood in Brooklyn, New York City, within an area known as South Brooklyn. Park Slope is roughly bounded by Prospect Park and Prospect Park West to the east, Fourth Avenue to the
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 0x03abcf672c67edf217f679c11889424c57892a38d013abf2897962bb1d03cb2b. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0b5b501-bc7e-4b61-b623-ec1612e4793a.json and https://artists.proofprofile.net/proofs/artist/a0b5b501-bc7e-4b61-b623-ec1612e4793a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).