multichain / smart-filter-examples

Sample code for Smart Filters in MultiChain 2.0

MultiChain Smart Filter Examples

This repository contains some examples of Smart Filters to be used with MultiChain 2.0.

License: Public domain, use as you like

About Smart Filters

A Smart Filter is a piece of code which is embedded in the blockchain, and which allows custom rules to be defined regarding the validity of transactions or data. Smart Filters are written in JavaScript and run within a deterministic version of Google’s V8 JavaScript engine, which is embedded directly within MultiChain 2.0 . This is the same JavaScript engine used in Chrome, Node.js and many other platforms. It offers excellent performance by compiling JavaScript to machine code and optimizing that code as it runs.

For more information and documentation, see Working with Smart Filters.

Smart Filters roadmap

Transaction filters define rules about whether a transaction is valid, by examining that transaction’s inputs, outputs and metadata. These are available since MultiChain 2.0 alpha 5. These examples requires some additional functionality introduced in MultiChain 2.0 alpha 6.

Stream filters define rules about whether the data in a stream item is valid, by examining that (on-chain or off-chain) data together with the item’s publishers and keys. These are available since MultiChain 2.0 alpha 6.

Enjoy and contribute

We welcome pull requests for this repository, containing your own Smart Filters. If the license for your Smart Filter code is anything other than public domain, please make that clear in the submitted file.