Ema or EMA may refer to: Biology and medicine Anti-Endomysial Antibodies test Epithelial membrane antigen European Medicines Agency, a European Union agency for the evaluation of medicinal produ
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 0x7b08dc0e4fbae83742a9e40ce8532069dcb5a73a9e0d2539978d70234f93bcc1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31a25d17-8972-4c1b-92e9-2a10173d70db.json and https://artists.proofprofile.net/proofs/artist/31a25d17-8972-4c1b-92e9-2a10173d70db.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).