Plenum Byzantine Fault Tolerant Protocol
Plenum is the heart of the distributed ledger technology inside Hyperledger
Indy. As such, it provides features somewhat similar in scope to those
found in Fabric. However, it is special-purposed for use in an identity
system, whereas Fabric is general purpose.
Technical Overview of Indy Plenum
Refer to our documentation site at indy.readthedocs.io for the most current documentation and walkthroughs.
Please find the general overview of the system in Overview of the system.
Plenum's consensus protocol which is based on RBFT is described in consensus protocol diagram.
More documentation can be found in docs.
- Please have a look at aggregated documentation at indy-node-documentation which describes workflows and setup scripts common for both projects.
Indy Plenum Repository Structure
- the main codebase for plenum including Byzantine Fault Tolerant Protocol based on RBFT
- basic crypto-related code (in particular, indy-crypto wrappers)
- Provides a simple, python-based, immutable, ordered log of transactions
backed by a merkle tree.
- This is an efficient way to generate verifiable proofs of presence
and data consistency.
- The scope of concerns here is fairly narrow; it is not a full-blown
distributed ledger technology like Fabric, but simply the persistence
mechanism that Plenum needs.
- state storage using python 3 version of Ethereum's Patricia Trie
- secure transport abstraction
- it has ZeroMQ implementations
- key-value storage abstractions
- contains leveldb implementation as the main key-valued storage used in Plenum (for ledger, state, etc.)
- Plenum makes extensive use of coroutines and the async/await keywords in
Python, and as such, requires Python version 3.5.0 or later.
- Plenum also depends on libsodium, an awesome crypto library. These need to be installed
- Plenum uses ZeroMQ as a secure transport
- A shared crypto library
- It's based on AMCL
- In particular, it contains BLS multi-signature crypto needed for state proofs support in Indy.
- Bugs, stories, and backlog for this codebase are managed in Hyperledger's Jira.
Use project name
- Join us on Jira's Rocket.Chat at
#indy-node channels to discuss.
How to Contribute
How to Start Working with the Code
Please have a look at Dev Setup in indy-node repo.
It contains common setup for both indy-plenum and indy-node.