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In a new [link url=http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=6&f=G&l=50&co1=AND&d=PG01&s1=blockchain&OS=blockchain&RS=blockchain target=_blank] patent[/link] Walmart describes the decentralized blockchain technology for its delivery drones. If a drone wants to pick up a parcel at a docking station, authentication is ensured via a blockchain ID. The database safely stores all relevant pieces of information about a parcel.