As technology develops, the
Internet of Things (IOT) becomes a topic that
is being mentioned over and over again. Many
things can be done online. One of them is
document signing activity. A company named
“XYZ” wanted to build a prototype
application using a framework that can build
and develop a multiplatform app that can be
used to sign a document and secure it with
digital certificates, and the transaction activity
is recorded and can be verified through a
blockchain system. This study aims to find out
how to apply blockchain system in a series of
digital signing activities, how are the concept
and how to verify a transaction that already
recorded in a blockchain system, and also how
to make a prototype that easy to develop
further for other platforms. In the end, the
application can be made easily using Expo,
Node.Js, and the process for recording and
verifying transactions can be done easily with
the help of Hyperledger Iroha