Drain may refer to: Objects and processes Drain (plumbing), a fixture that provides an exit-point for waste water or for water that is to be re-circulated on the side of a road Floor drain Drain
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 0xdafcd839e58bbefe9ccc5dfbb60f9ee97804240291c8b96d25816a6aee413320. Chain 2 (Bitcoin): anchored in block 954002 (2026-06-16T20:47:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/324e77cc-a3e0-4a84-9303-4e8d4bd0149a.json and https://artists.proofprofile.net/proofs/artist/324e77cc-a3e0-4a84-9303-4e8d4bd0149a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).