S2 or S II may refer to: Science and technology S2 (star), a star in the Milky Way galaxy S/2007 S 2, a natural satellite of Saturn S2 impact (ie, "Spherules 2"), major impact of early Earth S2 m
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 0x532832a07919ca3eb9ab81f6a7c326b6c3deee95218bf3efa84b85e2106f0d09. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/faa7a6e3-af89-44a2-b089-421d814da589.json and https://artists.proofprofile.net/proofs/artist/faa7a6e3-af89-44a2-b089-421d814da589.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).