2S or 2s may refer to: Science 2s electron in an atomic orbital 2S, a protein-folding intermediate with two disulphide bonds Transportation 2S gondola lift 2S, a series of Toyota S engines Bi
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 0xaa9ec25ed07969fda8f341a05d28ee1ba0404efb9affa8f2dc1375f441055ec9. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ec691d2-bad9-4de3-82c4-8c359abf0820.json and https://artists.proofprofile.net/proofs/artist/2ec691d2-bad9-4de3-82c4-8c359abf0820.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).