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Dev Release 23

May 3, 2024

Greeting BlockDAG Community!This week marked significant progress on the P2P implementation front for BlockDAG, paving the way for faster and more secure communication between nodes.
Key Highlights:

  • P2P Fundamentals: We delved into the core concepts of P2P networking and explored its potential integration within the BlockDAG chain.
  • Protocol Exploration: We examined various P2P protocols, including the gossip protocol, and analyzed their applicability within our architecture.
  • Network Building: We laid the groundwork for robust node-to-node communication by implementing stream channels and the MPSC (Multi Procedure Single Consumer) pattern.
  • Remote procedure call (RPC): Integrating RPCs into a BlockDAG system is crucial for enabling external interactions and providing a seamless user experience.

This is an ongoing effort. Since we have crux of previous days now, Today, I'm thrilled to introduce libP2P, a high-performance, modular, and developer-friendly P2P library specifically designed for blockDAG projects.

What is libP2P?

libP2P offers a comprehensive suite of tools and functionalities to seamlessly integrate P2P networking. It empowers developers to establish a robust P2P network, provides simplified node management, modular design and flexibility.
Using libP2P in blockDAG:1. Integration with blockDAG blockchain:

  • Runtime Integration: libP2P seamlessly integrates with the runtime environment. This allows developers to leverage features like modules, pallets, and off-chain workers for efficient P2P functionality within their blockchain applications.
  • Event System: libP2P can subscribe to and emit events within the runtime environment. This enables communication between the P2P network and the blockchain logic, facilitating data exchange and triggering blockchain actions based on network events.

2. blockDAG-Specific Features:

  • Customizable Network Topologies: modular design allows libP2P to be adapted to various network topologies beyond the typical mesh networks used in traditional blockDAG projects. This opens doors for exploring alternative network structures like directed acyclic graphs (DAGs) or hybrid approaches.
  • Integration with the Consensus Mechanisms: libP2P can be integrated with the POW consensus, when miners mine the block they will broadcast it to the network.

3. Advanced P2P Functionalities:

  • State Synchronization: libP2P can be used to implement state synchronization mechanisms, ensuring that all nodes within the network maintain a consistent view of the blockchain state. This is crucial for maintaining data integrity and enabling efficient block validation.
  • Incentive Mechanisms: the pallet framework allows for the implementation of custom incentive mechanisms within libP2P. This could involve token-based rewards or other economic models to encourage node participation and maintain network health.


While the core functionalities of libP2P like node discovery and communication are crucial, understanding a specific application like block propagation within a blockDAG context provides a deeper insight into its technical capabilities. Here's an outline of a possible algorithm:


1. Block Reception:

  • When a node receives a new block from a neighbor, it verifies the block's signature and validates its adherence to the blockDAG protocol rules (e.g., ensuring it references a valid parent block).

2. Block Validation:

  • The node performs necessary validation steps, such as verifying the block's content and any associated transactions. This might involve interacting with runtime for tasks like transaction execution or state updates.

3. Gossip-based Propagation:

  • If the block is valid, the node utilizes a gossip protocol to propagate the block to its connected neighbors within the P2P network. This ensures efficient dissemination of new blocks across the network.

4. Anti-Entropy:

  • To maintain data consistency, the node periodically performs anti-entropy checks with its neighbors. This involves comparing blockchains and identifying any discrepancies.
  • If discrepancies are found, the node initiates a process to resolve them, potentially requesting missing blocks or resolving conflicting forks.

5. Integration with Consensus Mechanism:

  • The propagated block is submitted to the chosen consensus mechanism within the blockDAG protocol.
  • The consensus mechanism finalizes the block and reaches agreement among nodes on its validity and inclusion in the blockchain.

Here's a pseudocode representation of the outlined algorithm for block propagation within a blockDAG:

Block Reception:

function onBlockReceived(block):

   if isValidBlock(block) and isAdheringToProtocol(block):


       if blockIsValid(block):



Block Validation: function validateBlock(block):

   if verifySignature(block) and validateContent(block):


       if blockIsFullyValid(block):



Gossip-based Propagation: function propagateBlock(block):

   for neighbor in connectedNeighbors:

       sendBlockToNeighbor(block, neighbor)


Anti-Entropy: function performAntiEntropy():

   for neighbor in connectedNeighbors:


       if discrepanciesFound():



Integration with Consensus Mechanism: function submitBlockToConsensus(block):

   if consensusMechanismAgrees(block):



Conclusion & next steps!

In conclusion, the introduction of libP2P represents a significant milestone in advancing the peer-to-peer networking capabilities of the blockDAG ecosystem. By seamlessly integrating libP2P into the blockDAG architecture, developers gain access to a powerful toolkit for building robust, scalable, and secure P2P networks.
Moving forward, continued collaboration, innovation, and refinement will be essential to realizing the full potential of libP2P within the blockDAG ecosystem. By addressing scalability challenges, enhancing security measures, and fostering community engagement, we can build a vibrant and resilient network that enables the seamless exchange of data and transactions, paving the way for the future of decentralized applications and blockchain technology.

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