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Detecting the use of input competitor in MemPool TX using the Bitcoin Core and Rest RPC **
As a developer who works with Bitcoin, you are probably familiar with the challenges of monitoring MEMPool for signed but unconfirmed transactions. One of these challenges is to detect the use of the input competitor in these transactions by other users. In this article, we will explore how to achieve this detection using Bitcoin Core’s API Rest (RPC).
Bottom
In Bitcoin, a transaction consists of a list of inputs and exits. Each input is associated with an exclusive address and each exit is linked to several entries through the coinbase field in the transaction header. To detect the use of the competitor of an input, we need to monitor transactions that update Mepool.
Rest Code
To solve this problem, we will write a rust client to interact with the Bitcoin Core RPC API. We will define a MEMPOOL structure to represent the state of the MemPool and a transaction structure to maintain the transaction data.
`Rest
Use bitcoin :: core :: {network, version};
Use Bitcoin :: REST :: Client;
#[Derive (network, debug)]
STRUCT MEMPOOL {
Transactions: vec ,
}
Impliol {
FN GET (& self) -> Result <vec , bitcoin :: error :: error> {
Customer :: New (” .get_network (network :: test) .Send ()?;
Leave mut txs = vec! [];
For transaction in self.transations.iter () {
txs.push (transaction.clone ());
}
OK (TXS)
}
}
Structure transaction {
Inputs: VEC ,
Outputs: vec ,
}
`
Input and exit structures
We will define two structures to represent the input and output data, respectively.
`Rest
#[DERIVE (DEBUG)]
Structure input {
Address: String,
}
#[DERIVE (DEBUG)]
Structure output {
Index: U16,
VALUE: U256,
}
`
Customer Implementation
To interact with the Bitcoin Core RPC API, we will create a client who can seek the state of Mempool. We will use the Bitcoin box: rest to establish a connection to the server and send requests.
`Rest
Use bitcoin :: core :: {network, version};
Use Bitcoin :: REST :: Client;
Impliol {
FN GET (& self) -> Result <vec , bitcoin :: error :: error> {
Leave the customer = client :: new ( “) .get_network (network :: test) .Send ()?;
Leave mut txs = vec! [];
For transaction in self.transations.iter () {
txs.push (transaction.clone ());
}
OK (TXS)
}
}
`
Detecting the use of the competitor
To detect the use of the competitor of an input, we will ite the transactions and check if any output is linked to multiple entries. If this link is found, it indicates that an input has bone used in another transaction.
`Rest
Impliol {
Fn detect_comurrent_use (& self) -> bool {
For transaction in self.transations.iter () {
For transaction output.outputs.iter () {
If output.Value!
Leave inputs = transaction.inputs.clone ();
for input in inputs.iter () {
Leave index = input.address.to_string ();
For other_input in outputs.iter () filter (| o.address == input.address) {
If others_input.Value! = 0 &&!
Return True;
}
}
}
}
}
}
False
}
}
`
Testing and running the code
To test our code, we will create a simple test set using position Test. We will define an MEMPOOL structure with an a a”get method that returns an empty vector.