EM, Em or em may refer to: Arts and entertainment Music Em, the E minor musical scale Em, the E minor chord Electronic music, music that employs electronic musical instruments and electronic music
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 0x30145e728e123ec53571033546f95b9b765f0786e4ed775b62b4de8f412680a1. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f3194a8-d320-44b3-aa69-418ca3f1b46b.json and https://artists.proofprofile.net/proofs/artist/0f3194a8-d320-44b3-aa69-418ca3f1b46b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).