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Creating a Self-Verifying Client (SPV) on Ethereum: A Step-by-Step Guide

As a self-node, you can use an SPV client to verify and download blocks from the Ethereum network without relying on centralized exchanges or nodes. This allows for greater control and flexibility in your blockchain research.

This article will walk you through the steps required to create and sync an SPV client with the Ethereum network.

What is a Self-Verifying Client (SPV)?

A Self-Verifying Client (SPV) is a software component that acts as an intermediary between a user’s client and the Ethereum network. Using an SPV client, you can verify the integrity of blocks without a centralized node.

Step 1: Download the Ethereum Blockchain

Before creating an SPV client, make sure you have downloaded the latest blockchain data to the Ethereum network. You can download block headers and transaction hashes using tools like “geth” or “ethers.js”.

Here is an example of how to create a basic SPV client using the geth command:

Create a new directory for your SPV client
mkdir etc

Install geth
npm install -g geth

Download the latest blockchain data for Ethereum
geth downloadblockchain --datadir ./data

Step 2: Configure the Bloom Filter

To configure the Bloom filters, you need to create a “bloomfilter.json” file in your ./data/ directory. This file stores information about the addresses you want to verify.

Create the following files:

{
"addresses": {
"0x1234567890abcdef": true,
"0x234567890abcdef1": false
}
}

This specification tells “bloomfilter.json” to mark the address “0x1234567890abcdef” as validated.

Step 3: Connecting to the peer network

To synchronize with peers, you need to create an SPV client with the node protocol of your choice (e.g. JSON-RPC or Websocket). This allows you to connect to multiple nodes and verify blocks independently.

Here is an example of using ethers.js:

const ethers = require('ethers');
// Create a new Ethereum provider instance
const provider = new ethers.providers.JsonRpcProvider('
// Configure the SPV client with your desired node protocol (e.g. JSON-RPC or Websocket)
const spvClient = new ethers.SpvClient(provider, {
// Set the bloom filter configuration to 0x1234567890abcdef
bloomFilter: {
addresses: [
'0x1234567890abcdef'
],
value: true
}
});

Step 4: Download all block headers since the last checkpoint

Once your SPV client is configured and connected to the peer, you can start downloading block headers since the last checkpoint.

Here is an example of using “geth”:

Download all block headers since the last checkpoint
geth downloadblockchain --datadir ./data --maxBlockNumber 1000000

Step 5: Re-request each block…

To ensure that your SPV client is working properly, you need to re-request each block. This ensures that the client has received all blocks since the last checkpoint.

Here is an example of using ethers.js:

// Download all block headers since the last checkpoint
geth downloadblockchain --datadir ./data --maxBlockNumber 1000000
// Re-request each block...
const geth = new ethers.SpvClient(provider, {
// Set bloom filter definition to address 0x1234567890abcdef
bloomFilter: {
addresses: [
'0x1234567890abcdef'
],
value: true
}
});
// Reload all block headers since the last checkpoint
geth downloadblockchain --datadir ./data --maxBlockNumber 1000001

By following these steps, you can create a self-verified client (SPV) on Ethereum and ensure the integrity of blocks without relying on centralized nodes.

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