LOS, or Los, or LoS may refer to: Science and technology Length of stay, the duration of a single episode of hospitalisation Level of service, a measure used by traffic engineers Level of signific
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 0xd55f8dbb46454e7289ae0ea05e51e57a076347108d7bc59f9cc5a6b20c585d3f. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7991d887-b302-4976-9180-fb44920643e0.json and https://artists.proofprofile.net/proofs/artist/7991d887-b302-4976-9180-fb44920643e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).