SEM or Sem can refer to: Computing Search engine marketing, promoting websites by increasing their visibility in search engine results Security event manager, a security log tool used on data ne
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6ed4e60705ffafd52036bd9f8d1626128602f758ef92c641bcf862b8073edd. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f8db07a-6d89-4516-a777-ecba599afa91.json and https://artists.proofprofile.net/proofs/artist/8f8db07a-6d89-4516-a777-ecba599afa91.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).