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Dev Release 19

April 29, 2024

Greetings community!

Hope you all had a great weekend
This week at BlockDAG project, we're obsessed with pushing the boundaries of blockchain technology. One key area of focus is the power of peer-to-peer (P2P) networks to unlock true scalability and usher in a new era of decentralized applications. By the end of day we came up with an example implementation that we're excited to share with community through today's dev release. Let's jump in!

The Power of P2P

Traditional blockchains often rely on centralized servers or complex mining mechanisms, creating bottlenecks that hinder transaction speed and network efficiency. P2P networks offer a revolutionary alternative. In a P2P blockchain like blockDAG, each node acts as both a client and a server.

Technical Underpinnings

BlockDAG's P2P network leverages several key algorithms to achieve its impressive performance:

  1. Gossip Protocols: These protocols enable efficient message propagation across the network. Nodes share information with their peers, ensuring all participants are updated on the latest transactions. Popular gossip protocols used in P2P blockchains include:

 a. Binary Gossiping Protocol (BGP): BGP leverages a push-based approach, where nodes actively push messages to a randomly chosen subset of their peers. This code snippet (in Python) demonstrates a simplified example of BGP message broadcasting:

def broadcast_gossip(self, message):
  # Select a random subset of connected peers
  peers = random.sample(self.connected_nodes, k=self.fanout)
  # Send the message to each selected peer
  for peer in peers:

b. Directed Acyclic Graph (DAG) Gossiping Protocol: This protocol leverages the structure of the blockDAG itself for message propagation. Nodes only share transactions with their parents in the DAG, reducing message redundancy and improving efficiency.

2. Consensus Mechanisms:  These algorithms ensure agreement among nodes on the validity of transactions and the current state of the ledger. In blockDAG, you might consider employing a variant of Byzantine Fault Tolerance (BFT) consensus, specifically designed for asynchronous networks with potentially faulty nodes.

3. Cryptography:  Robust cryptographic primitives are essential for securing communication and transactions within the P2P network. blockDAG can utilize elliptic curve cryptography (ECC).

4. Digital Signatures: Transactions are signed with the sender's private key using ECC, ensuring authenticity and preventing unauthorized modifications.
Key Management: Public-key cryptography (ECC public keys) can be used for secure communication and identity verification between nodes.

Building on blockDAG's P2P Network

BlockDAG's P2P network, coupled with our innovative Directed Acyclic Graph (DAG) technology, unlocks a new level of potential for developers. Unlike traditional blockchains with linear chains, blockDAG enables parallel transaction processing, significantly boosting throughput for your dApps
To implement the P2P network part we have come with an example implementation as per our understanding so far.

Here's a high-level algorithm outlining a possible approach to implementing a P2P network in BlockDAG:

1. Node Initialization
Each node maintains a local copy of the blockDAG ledger.
The node establishes a P2P connection pool to manage connections with other nodes in the network.
The node implements a gossip protocol (e.g., Binary Gossiping Protocol or DAG Gossiping Protocol) to receive and propagate information about new transactions and DAG structures.


2. Transaction Broadcasting
When a new transaction originates at a node, it is digitally signed using the node's private key.
The signed transaction is broadcasted to the node's connected peers via the gossip protocol.


3. Transaction Validation
Upon receiving a transaction broadcast, a node performs validation checks to ensure:
The transaction is well-formed and follows the protocol's defined structure.
The digital signature on the transaction is valid, confirming the sender's identity.
The transaction adheres to any predefined business rules or tokenomics within the blockDAG network.


4. Consensus Mechanism
Validated transactions are relayed to other nodes through the gossip protocol.
Nodes achieve consensus on the validity of transactions and the current state of the ledger using a Byzantine Fault Tolerance (BFT) consensus variant suitable for asynchronous P2P networks. This ensures all nodes agree on the accepted transactions and the DAG structure.


5. Ledger Update
Once consensus is reached on a transaction's validity, the transaction is added to the local copy of the blockDAG ledger on the node.


6. Network Maintenance
The node continuously monitors the health of its connections within the P2P pool.
It may discover new nodes through gossip protocol messages and establish connections with them to improve network resilience.
Nodes with suspicious behavior or prolonged inactivity might be removed from the connection pool to maintain network integrity.

Conclusion & next steps!

These will be the rough implementation of P2P networks in BlockDAG project, as the week pass by we'll come up with more technical algorithms and pseudo codes around this implementation. P2P networks represent the cornerstone of a future-proof blockchain ecosystem. By leveraging this powerful technology and the technical algorithms that underpin it, blockDAG empowers developers to create a new generation of scalable, secure, and efficient dApps.  Stay tuned for more concrete implementation in BlockDAG

We're also thrilled to announce a game-changer for mobile mining: The X1 Miner application is blasting off on the Play Store on June 1st. 

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