Understand the behavior of Bitcoin RPC calls and corrupt the status of the chain

As an enthusiastic taxpayer to the Blockchain community, it is likely not alien to the complexities of Bitcoin’s decentralized architecture. However, when it comes to monitoring and indexation of local nodes, a problem has been disconcerting many developers: the status of the chain after numerous calls from RPC (remote procedure call).

In this article, we will deepen the details of why this is happening, will explore possible causes and provide guidance on how to mitigate the problem.

What is happening with RPC calls?

When making an RPC calling authserviceproxy.batch (), Bitcoin’s Daemon (the process that manages the block chain) receives a list of transactions to execute. These transactions are verified by the network and are added to the block chain.

Every time you make an RPC call, its node (local node or remote node) starts a new connection with the bitcoin server. This creates a new set of RPC connections, which can lead to a scenario known as “RPC Outing”. The key problem here is that each RPC call creates a temporary connection with the network, which can make the status of the chain corrupt.

The problem: corrupt the state of the chain

Imagine that you are playing a game in which you have a copy of the board. When another player (the devil) makes a movement (called RPC), he must update his own copy of the board to reflect the change. If you do not update your copy, both players end with different boards.

Similarly, when RPC calls are made, each node has its own copy of the status of the chain. However, if multiple nodes make RPC calls simultaneously, they can overwrite the changes of others, corrupting the state of the chain.

Causes and contributing factors

There are several reasons why this problem could be happening:

• Insufficient registration : If your local node is not configured to record the calls RPC or resulting transactions, you will not know what is happening in real time.

• RPC Overhead : The overload of making an RPC call can lead to temporary connection losses or waiting times, which can make the status of the chain corrupt.

• Network instability : network interruptions, such as connection drops or package loss, can affect the accuracy of the copy of your local chain state node.

• Incorrect configuration

  

  : If your local node is incorrectly configured (for example, using an outdated rpcuser o’rpccommmon), you can not correctly synchronize other nodes.

Solutions and solutions

To mitigate the problem, consider the following:

• Enable the registration : Configure the record to trace the calls RPC and the resulting transactions.

• Use a more robust RPC library : Consider using a library aslibp2p-xmlrpco'bip20-RPC which provides better errors management and connection administration.

• Configure your local node correctly : Be sure to use the rpcuser,rpccommmon 'correct and any other required authentication credential.

• Implement synchronization mechanisms : Use tools such asrsyncto synchronize your local node data with other nodes on the network.

By understanding the root cause of the problem, implementing these solutions and testing them thoroughly, it will be on the way to solving the corruption of the state of the chain after numerous calls from RPC.

Python Script example

` Python

import authserviceproxy

Configure record

logging.basicconfig (level = logging.info)

Def get_rpc_calls () ::

Simulate some RPC calls

rpc_call1 = authserviceproxy.batch (‘gettransaction’, {‘index’: 1, ‘transactionid: 123})

rpc_call2 = authserviceproxy.batch (‘gettransaction’, {‘index’: 2, ‘transactionid’: 456})

return [rpc_call1, rpc_call2]

Def Main () ::

Get RPC calls

calls = get_rpc_calls ()

Record the results

To call calls:

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