Null may refer to: Science, technology, and mathematics Astronomy Nuller, an optical tool using interferometry to block certain sources of light Computing Null (SQL) (or NULL), a special marker 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 0x34c2b7d8f4567f1d9a937e9b7df869eb9504bedd5f6f8306cccdbd5f3da8b991. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20f4cf13-c35f-4269-881c-bd1ba4e9afc5.json and https://artists.proofprofile.net/proofs/artist/20f4cf13-c35f-4269-881c-bd1ba4e9afc5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).