Double X Posse, also known as Double XX Posse, was an American 1990s hip hop group from Jersey City, New Jersey. Their debut album Put Ya Boots On (1992), spawned two successful singles. The first and
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 0xaf6220377f52465dc2b32c16d85034ec88d5f4e01a6b65d9600b0c26fbef328b. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1a35468-e7ce-4dcc-92c8-a56bbdaa5cdd.json and https://artists.proofprofile.net/proofs/artist/b1a35468-e7ce-4dcc-92c8-a56bbdaa5cdd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.