bsv is a library for managing user keys, building and signing bitcoin transactions (including inputs, outputs and scripts), signing generic data, encrypting generic data, or doing anything that a client-side web wallet is likely to need to do.
It is not necessary to use bsv to use Money Button. However, advanced applications will often want to do sophisticated low-level Bitcoin operations that need a library for that purpose.
The most important use of bsv for Money Button apps right now is to write OP_RETURN data to the blockchain.
To add bsv to your application, you can either use node.js or web browsers.
In node.js, first install the library using yarn:
yarn add bsv
npm install --save --save-exact bsv
And then add to your code:
let bsv = require('bsv')
In a web browser, we recommend using webpack and React. However, a good way to get going quickly is to use unpkg. Add this to the top of your HTML in the head tag:
Please be sure to always specify the exact version of the library. In the above example, we are using v0.30.0. You can always find the latest version number on npm.