merkle-tree | Contains implementation of merkle tree

by gomathi Java Version: Current License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(3)Vulnerabilities Install Support

kandi X-RAY | merkle-tree Summary

merkle-tree is a Java library. merkle-tree has no bugs, it has no vulnerabilities, it has a Permissive License and it has high support. However merkle-tree build file is not available. You can download it from GitHub.

Merkle tree(Hash trees) is used in distributed systems(and many other places) to detect differences between two large datasets by using minimal network transfers. More information is avaiable in wikipedia. ![Image of merkle tree] ([Amazon Dynamo] (has used that in its implementation. There are even few [opensource] (implementations available. In one of my projects, we replicate some users' data acros multiple locations asynchronously. Replica nodes can differ from primary node's data for various reasons. So we needed a system where it can detect inconsistency between primary and replica with minimal overhead, and also synchronize the replica's data if needed. Even though there are many opensource implementations of merkle tree available, those are main memory based, do not retain anything between process restarts. So I have implemented a merkle-tree based system, which provides a way to persist partially built merkle tree on disk, and also some sophisticated functionalities, which can be customized further. In the following design I will use the term HashTree instead of Merkle-tree. Both terms refer to same idea. There are two main components,.

Support

Quality

Security

License

Reuse

Support

merkle-tree has a highly active ecosystem.

It has 9 star(s) with 3 fork(s). There are 2 watchers for this library.

It had no major release in the last 6 months.

merkle-tree has no issues reported. There are no pull requests.

It has a negative sentiment in the developer community.

The latest version of merkle-tree is current.

Quality

merkle-tree has no bugs reported.

Security

merkle-tree has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

merkle-tree is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

merkle-tree releases are not available. You will need to build from source code and install.

merkle-tree has no build file. You will be need to create the build yourself to build the component from source.

Top functions reviewed by kandi - BETA

kandi has reviewed merkle-tree and discovered the below as its top functions. This is intended to give you an instant insight into merkle-tree implemented functionality, and help decide if they suit your requirements.

Creates a database and synchches for the primary store
Update the local subtree with the given node id
Sync the segment with the given segment id
Synchronized
Returns a list of dirty segments in the database
Generate a base key with the given tree ID and tree ID
Handles a rebuild hash tree request
Submits a new rebuild response to the hash tree
Removes the element from the queue
Process a rebuild hash tree response
Gets a single segment
Returns the segment data
Get the value associated with the key
Compares this SegmentData with the specified object
Clear all tokens
Sort hash tree
Deletes the specified tree
Stops the hash trees
Clear all set bits
Compare this name to specified server name
Compares this segment with the specified hash
Sets the value of the given field
Compares this key with the specified value
Compare two RebuildHashHashTreeResponse objects
Sets the specified field value

Get all kandi verified functions for this library.

merkle-tree Key Features

No Key Features are available at this moment for merkle-tree.

merkle-tree Examples and Code Snippets

No Code Snippets are available at this moment for merkle-tree.

Community Discussions

Trending Discussions on merkle-tree

apksigner --v4-no-merkle-tree option does not exist

A simple merkle-tree implementation in java

How can merkle trees help validate the content of a block in a blockchain

QUESTION

apksigner --v4-no-merkle-tree option does not exist

Asked 2021-Mar-04 at 20:53

The Android developer documentation explained that there is an option --v4-no-merkle-tree but the option does not exist. I'm doing this way to sign via CMD

...

ANSWER

Answered 2021-Mar-04 at 20:53

This is a documentation error. The flag does not exist nor has ever existed.

Edit: Now removed from documentation.

Source https://stackoverflow.com/questions/66460734

QUESTION

A simple merkle-tree implementation in java

Asked 2019-May-31 at 01:14

I am attempting to write a very simple merkle-tree implementation in Java.

I am using the values of the txids in block 170 on the bitcoin blockchain for reference, so I can see what the correct result should be.

The txids corresponding with that block are as follows:

...

ANSWER

Answered 2019-May-31 at 01:14

You're not understanding what a byte[] is in Java. The strings in your example are "hex" representations of a byte[]. See How do I initialize a byte array in Java?

Source https://stackoverflow.com/questions/56386764

QUESTION

How can merkle trees help validate the content of a block in a blockchain

Asked 2018-Oct-20 at 06:01

To my understanding the merkle-tree can be used to separate the actual transactions (or other content) of a block and its validation process, by recursively applying hash functions to the blocks content.

This makes it possible to implement simplified payment validation (or the validation of any other data within a block).

The linked definition states that SVP is a

[...] method for verifying if particular transactions are included in a block without downloading the entire block.

If the merkle tree is a method to check if a specific transaction was part of a block, this implies that we do not "trust the block" and are thus checking if the hash of the searched transaction is part of the tree. If we do not trust the block (or the original validator of the block) how come we trust the merkle tree, which could also be faked (or could it not?).

Are we "just" relying on the fact that has values are pseudo random and that it would be hard to create a fake tree with the same root-value, but one different node value?

Thanks!

...

ANSWER

Answered 2018-Oct-20 at 06:01

Understanding Merkle Tree
Merkle tree allows us to mutliplex a number of transactions in a single block of the ledger. Every leaf node of the tree is representative of a single transaction. Whereas all other nodes are hashes of their children.

What is the benefit of this ?
The transaction block will need to store only the root of a Merkle Tree. The purpose that SPV states is that any client who is transacting on the chain can just store the path of hashes from the root to their transaction instead of storing the whole ledger, which can be very large in size.

We do not trust the block ?
Once your transaction is processed, you can verify that it has been added to the ledger by tracing the path from root provided in the block to the leaf node that is your transaction. So you verify to ensure if your transaction was actually processed or not.

Can it be faked ?
No. Once a block is accepted onto the main chain, which is usually the addition of about 5 or 6 more blocks in bitcoin, your transaction is irreversible. The very concept of blockchain is that the ledger is immutable. This means that the root of merkle trees are also permanently stored in the ledger and cannot be modified. Now to keep track of your transaction, you can just store the headers and the path from root to your transactions.

Source https://stackoverflow.com/questions/52896276

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install merkle-tree

You can download it from GitHub.
You can use merkle-tree like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the merkle-tree component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

Find more information at: