https://github.com/izqui/blockchain

A basic blockchain implementation written in Go
https://github.com/izqui/blockchain

Last synced: about 1 month ago
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A basic blockchain implementation written in Go

• Host: GitHub
• URL: https://github.com/izqui/blockchain
• Owner: izqui
• Created: 2014-08-13T18:55:50.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2014-08-28T18:38:05.000Z (almost 10 years ago)
• Last Synced: 2024-04-14T18:03:39.352Z (3 months ago)
• Language: Go
• Homepage:
• Size: 2.77 MB
• Stars: 836
• Watchers: 77
• Forks: 244
• Open Issues: 5
• Metadata Files:
  • Readme: README.md

Lists

• awesome-blockchain - **Go**: _Having fun implementing a blockchain using Golang_
• awesome-blockchain - **Go**: _Having fun implementing a blockchain using Golang_
• awesome-stars - izqui/blockchain - A basic blockchain implementation written in Go (Go)
• awesome-block - **Go**: _Having fun implementing a blockchain using Golang_
• awesome-blockchain - **Go**: _Having fun implementing a blockchain using Golang_

README

        
# Blockchain

Having fun implementing a blockchain using Golang.

Using [Minimum Viable Blockchain](https://artsec.hackpad.com/Blockchains-and-Bitcoins-mR2wlQ4KbVQ)

### Keys

The Blockchain uses ECDSA (224 bits) keys. 

When a user first joins the blockchain a random key will be generated.

Keys are encoded using base58.

Given x, y as the components of the public key, the key is generated as following:

```

	base58(BigInt(append(x as bytes, y as bytes)))

```

### Proof of work

In order to sign a transaction and send it to the network, proof of work is required. 

Proof of work is also required for block generation.

### Protocol

The blockchain runs on port `9191` and uses TCP to handle connections among peers.

##### Message

* Message type (1 byte)

	```

	const (

		MESSAGE_GET_NODES = iota + 20

		MESSAGE_SEND_NODES

		MESSAGE_GET_TRANSACTION

		MESSAGE_SEND_TRANSACTION

		MESSAGE_GET_BLOCK

		MESSAGE_SEND_BLOCK

	)

	```

* Options (4 bytes): Data specific

* Data (n bytes): Data specific

##### Transaction

	

* Header: 

	* From (80 bytes): Origin public key

	* To (80 bytes): Destination public key

	* Timestamp (4 bytes): int32 UNIX timestamp

 	* Payload Hash (32 bytes): sha256(payloadData)

	* Payload Length (4 bytes): len(payloadData)

	* Nonce (4 bytes): Proof of work

* Signature (80 bytes): signed(sha256(header))

* Payload data (Payload Length bytes): raw data

##### Block

* Header:

	* Origin (80 bytes): Origin public key

	* Timestamp (4 bytes): int32 UNIX timestamp

	* Previous block (32 bytes): sha256(previous block header)

	* Merkel Root (32 Bytes): sha256(transaction hashes)

	* Nonce (4 bytes): int32 UNIX timestamp

* Signature (80 bytes): signed(sha256(header))

* Block transactions