D-Engraver provides blockchain-based remote deal-closing platform "HashSign" for B2B, B2C business, that can turn the cost of physical signature, search, and recreation process into zero. Hashtag platform allows dealing parties to accomplish high-security digital signature and ID tracing solution with complete business flows and full visibilities by timeline. More importantly, the signed agreement, 3D facial records and digital signature will be encrypted and stored on blockchain using our patent blockchain technology. Any information could be concurrently rolled back on this evidence chain by multiple operators along the timeline to different historical states, without any cost of affecting the current system data. 

https://hashsign.d-engraver.hk/auth