Questions tagged [blockchain]
A blockchain is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Each block typically contains a hash pointer as a link to a previous block, a timestamp and transaction data. By design, blockchains are inherently resistant to modification of the data. A blockchain can serve as an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way.
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Bitcoin Hash (Merkle) Tree implementation in Java
I'm learning about how full nodes can send a Merkle root + a list of hashes, so that a light client can verify a transaction.
I couldn't find any good resources on how to implement it. I just knew ...
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Grokking the basics of BlockChain with Python
As I was streaming I had a brilliant visitor suggest we write a blockchain in Python.
So we did.
Note that there is no validation or voting simulated here.
Here's the results, in ...
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A register of government decrees, authenticated with blockchain and public key cryptography
The full repo is here, but I'll post the most important extracts below.
Background
I'm trying to get the hang of blockchain and public key cryptography, so I thought it would be fun to create a ...
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Solidity: verifying primality certificates, bounty for large primes
This is my first smart contract, and it isn't finished yet, but the remaining bits are complicated enough that I'd like to make sure I'm on the right track first. My concerns are:
At line 117, is the ...
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Bash bitcoin blockchain explorer
I wrote a little bash script that displays the transaction info in json:
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Blockchain implementation in F#: Wallet
Introduction
This is Part 3 of my F# blockchain implementation. Previous parts:
Block and Blockchain
Transactions
Code
In this part I am implementing a wallet functionality. The code is based on a ...
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Blockchain implementation in F#: Transactions
Introduction
This is Part 2 of my F# blockchain implementation. Previous parts:
Block and Blockchain
Code
This time I am tackling transactions. The code is based on a JavaScript blockchain ...
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Blockchain implementation in F#: Block and Blockchain
Some time ago I started writing a blockchain implementation for learning purposes. I used this article as reference. Originally I wrote the code in C# but recently I have rewritten everything to F#. ...
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Solidity code for TimeBasedWill (smart contract)
Following is a TimeBasedWill I have written in Solidity to be built on the Ethereum Blockchain.
I have tested the code using Remix IDE.
I would like to get your comments and opinions about security ...
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Implementing blockchain block in C++11
I want to rewrite blockchain source code from Golang to C++11. Please, review my code and help me to improve it.
Source in Golang:
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A blockchain implementation in 207 lines of code
There is a blockchain class with minimal functionality inspired by naivechain. It has template data and hash function parameters:
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Customizable Blockchain's block structure
I'm creating a new open-source blockchain framework for .NET Core and .NET Standard. But I have some questions about how to make block structure to be customizable and look beautiful.
Let's begin ...
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Listens for custom messages on the production Bitcoin blockchain
The application listens for OP_RETURN messages on the Bitcoin blockchain and prints them to standard output. OP_RETURN is a custom transaction locking script that can store data, but nothing beyond ...
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