Nightfall or night fall may refer to: Time of day Sunset or sundown, the daily disappearance of the Sun below the western half of the horizon Twilight, the period during which the Sun is at most
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 0x3e266330e80f7f653d3f67ac4e43346e1a9aaa761ae5116f56390980a2b19917. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27041a39-512a-4f8d-bc72-89e332d74871.json and https://artists.proofprofile.net/proofs/artist/27041a39-512a-4f8d-bc72-89e332d74871.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).