Blockchain Development with Hyperledger

Asset definitions

We now come to the first really significant definition–the letter of credit asset:

 asset LetterOfCredit identified by letterId {   o String letterId   --> Customer applicant   --> Customer beneficiary   --> Bank issuingBank   --> Bank exportingBank   o Rule[] rules   o ProductDetails productDetails   o String [] evidence   --> Person [] approval   o LetterStatus status   o String closeReason optional }

Let's spend a little time on this definition, as it's both central to understanding the business network, and Hyperledger Composer in particular.

First, note the asset keyword. It indicates that what follows is a data structure that describes an asset. It's just like a type definition in a normal programming language, but with some special characteristics ...