Several companies have filed patents in the US for Blockchain technology recently, from Chinese company Lenovo's patent application in February for
Blockchain document verification to PayPal's patent application earlier this month for a system to speed up crypto trading transaction times.
Office Applications Verify Docs On Bitcoin, Ethereum Stampery, which provides
verification of
documents against both the Bitcoin and Ethereum
blockchains, will be accessible for verifying emails without users leaving Outlook itself.