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Implementation of Ethereum Merkle Tree: Present’s check
Merkle trees have become an essential data structure in the Ethereum ecosystem, allowing developers to check and effectively recover large data sets. The algorithm used to verify that there is a specific element in a Merkle tree is known as « the algorithm to check if an element is present » or simply the « IS_PREAT (element) method ».
What is a Merkle tree?
A Merkle tree is a binary tree structure that allows effective data integrity and authentication. It consists of several leaves, each representing a block or transaction in the Ethereum blockchain. The root node of the tree contains all the nodes of the leaves, creating a hierarchical structure.
IS_PREVENT (Item) algorithm **
To check if there is an element in a Merkle tree, we must cross the shaft from the root to the knots of the leaves and check if each subtle subtra in any given position contains the specified element. The algorithm involves several steps:
- The basic case:
If the current node value matches the target element, it returns true.
- * Case recursive: other, call recursively
is_present (element)to the left child (if there) and the right child (if any). If either a recursive appeal returns true, come back TRUE.
Implementation in solidity
Here is an example of implementing the is_prent (element) function in solidity:
`Solidity
Pragma solidity ^0.8.0;
Merkletree contract {
// array to store all leaves (blocks or transactions) in the tree
map (address => uint256 []) public leaves;
// operation to create a new leaf knot
Function Createleaf (address _node, uint256 [] memory _Data) public {
leaves [_node] .push (_Data);
}
// function to check if there is an item in the Merkle tree
Ispresent Fun
// Basic case: If the current node value fits with the target element, return True.
if (leave [msg.sender] [0] == _ement) {
Turn back;
}
// Recursive case: Otherwise, call for recursive is_present (item) to the left child
// and the right child. If either a recursive appeal returns true, come back TRUE.
for (uint256 i = 1; i <leaves [msg.sender] .length; i ++) {
if (leave [msg.sender] [i] == _ement) {
Turn back;
}
if (ispresent (_ element)) {
Turn back;
}
}
// If no match is found, turn fake.
returns false;
}
}
«
Explanation and links
* The structure of Merkle Tree Data : This article offers a detailed explanation of the Merkle tree data structure and its implementation. [Learn more: Ethereum Blockchain Basics] (
* IS_PREAST FUNCT : This function implements the IS_PREVANT (element) algorithm, allowing you to check if there is an item in a Merkle tree. [Solidity tutorial: How to implement the ispressive function] (
*! [Tutorial Ethereum Blockchain: How to create a Merkle tree] (
additional resources
* Merkle shaft implementation : This article provides more in -depth information on how to implement the IS_Present function using a different approach.
* [Solidity tutorial: understanding and implementation of trees Merkle] (