Dos or DOS may refer to: Computing Disk operating system List of disk operating systems called DOS DOS, common shorthand for MS-DOS and compatible operating systems Data over signalling (DoS), mu
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 0xc8913727a9270e9f4b1df402c698a0e638129379e9a6eefff2f382cd547aab27. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/191e1873-f839-493c-95a5-5c92ee02a05b.json and https://artists.proofprofile.net/proofs/artist/191e1873-f839-493c-95a5-5c92ee02a05b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).