### Docker Deployment for Blockchain Nodes

Source: https://context7.com/dvf/blockchain/llms.txt

Guides on deploying multiple blockchain nodes using Docker containers. This facilitates isolated network testing and simplifies the management of distributed environments.

```bash
# Build the Docker image
docker build -t blockchain .

# Run multiple nodes on different ports
docker run --rm -p 5000:5000 blockchain
docker run --rm -p 5001:5000 blockchain
docker run --rm -p 5002:5000 blockchain
```

--------------------------------

### Running Multiple Blockchain Nodes (Bash)

Source: https://context7.com/dvf/blockchain/llms.txt

Instructions for setting up and running a distributed blockchain network using multiple nodes via the command line. Includes starting nodes on different ports and registering them.

```bash
# Terminal 1: Start first node on port 5000
pipenv run python blockchain.py -p 5000

# Terminal 2: Start second node on port 5001
pipenv run python blockchain.py -p 5001

# Terminal 3: Start third node on port 5002
pipenv run python blockchain.py -p 5002

# Register nodes with each other (from node 5000)
curl -X POST -H "Content-Type: application/json" -d '{
  "nodes": ["http://localhost:5001", "http://localhost:5002"]
}' http://localhost:5000/nodes/register

# Mine some blocks on node 5001
curl http://localhost:5001/mine
curl http://localhost:5001/mine
curl http://localhost:5001/mine

# Sync node 5000 with the network (will adopt the longer chain from 5001)
curl http://localhost:5000/nodes/resolve
```

--------------------------------

### Get the Full Chain

Source: https://context7.com/dvf/blockchain/llms.txt

Retrieves the complete blockchain including all blocks and their transactions. Returns the chain array and its length, useful for verifying the blockchain state or implementing consensus.

```APIDOC
## GET /chain

### Description
Retrieves the complete blockchain including all blocks and their transactions.

### Method
GET

### Endpoint
/chain

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```bash
curl http://localhost:5000/chain
```

### Response
#### Success Response (200)
- **chain** (array) - An array of block objects representing the blockchain.
- **length** (integer) - The total number of blocks in the chain.

#### Response Example
```json
{
  "chain": [
    {
      "index": 1,
      "timestamp": 1506057125.900785,
      "transactions": [],
      "proof": 100,
      "previous_hash": "1"
    },
    {
      "index": 2,
      "timestamp": 1506057130.123456,
      "transactions": [
        {
          "sender": "0",
          "recipient": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
          "amount": 1
        }
      ],
      "proof": 35293,
      "previous_hash": "a1b2c3d4..."
    }
  ],
  "length": 2
}
```
```

--------------------------------

### Get Full Blockchain - REST API

Source: https://context7.com/dvf/blockchain/llms.txt

Retrieves the entire blockchain, including all blocks and their transactions. This endpoint is crucial for verifying the current state of the blockchain and for implementing consensus mechanisms.

```bash
# Get the full blockchain
curl http://localhost:5000/chain

# Response:
{
  "chain": [
    {
      "index": 1,
      "timestamp": 1506057125.900785,
      "transactions": [],
      "proof": 100,
      "previous_hash": "1"
    },
    {
      "index": 2,
      "timestamp": 1506057130.123456,
      "transactions": [
        {
          "sender": "0",
          "recipient": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
          "amount": 1
        }
      ],
      "proof": 35293,
      "previous_hash": "a1b2c3d4..."
    }
  ],
  "length": 2
}
```

--------------------------------

### Register Nodes

Source: https://context7.com/dvf/blockchain/llms.txt

Registers new nodes in the blockchain network for distributed consensus. Accepts a list of node addresses and adds them to the network. Required for multi-node setups where chains need to synchronize.

```APIDOC
## POST /nodes/register

### Description
Registers new nodes in the blockchain network for distributed consensus.

### Method
POST

### Endpoint
/nodes/register

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **nodes** (array of strings) - Required - A list of node addresses to register.

### Request Example
```json
{
  "nodes": ["http://192.168.0.5:5000", "http://192.168.0.6:5001"]
}
```

### Response
#### Success Response (200)
- **message** (string) - Confirmation message.
- **total_nodes** (array of strings) - A list of all currently registered nodes.

#### Response Example
```json
{
  "message": "New nodes have been added",
  "total_nodes": ["192.168.0.5:5000", "192.168.0.6:5001"]
}
```
```

--------------------------------

### Python Blockchain Operations

Source: https://context7.com/dvf/blockchain/llms.txt

Demonstrates core blockchain operations in Python, including registering nodes, resolving conflicts via longest-chain consensus, validating the chain, and getting block hashes.

```python
blockchain.register_node('http://192.168.0.5:5000')
blockchain.register_node('http://192.168.0.6:5001')
print(f"Registered nodes: {blockchain.nodes}")

replaced = blockchain.resolve_conflicts()
if replaced:
    print("Our chain was replaced by a longer valid chain")
else:
    print("Our chain is authoritative")

is_valid = blockchain.valid_chain(blockchain.chain)
print(f"Chain valid: {is_valid}")

block_hash = Blockchain.hash(blockchain.last_block)
print(f"Last block hash: {block_hash}")
```

--------------------------------

### Register Nodes - REST API

Source: https://context7.com/dvf/blockchain/llms.txt

Adds new nodes to the blockchain network, enabling distributed consensus. This endpoint accepts a list of node addresses and is essential for multi-node blockchain setups to synchronize their states.

```bash
# Register peer nodes
curl -X POST -H "Content-Type: application/json" -d '{
  "nodes": ["http://192.168.0.5:5000", "http://192.168.0.6:5001"]
}' http://localhost:5000/nodes/register

# Response:
{
  "message": "New nodes have been added",
  "total_nodes": ["192.168.0.5:5000", "192.168.0.6:5001"]
}
```

--------------------------------

### Node Registration and Management

Source: https://context7.com/dvf/blockchain/llms.txt

APIs for registering new nodes to the network and resolving chain conflicts.

```APIDOC
## POST /nodes/register

### Description
Registers a list of new nodes with the blockchain network. The nodes are expected to be in the format 'http://<ip>:<port>'.

### Method
POST

### Endpoint
/nodes/register

### Parameters
#### Query Parameters
None

#### Request Body
- **nodes** (array of strings) - Required - A list of node URLs to register.

### Request Example
```json
{
  "nodes": ["http://localhost:5001", "http://localhost:5002"]
}
```

### Response
#### Success Response (200)
- **message** (string) - Confirmation message indicating the number of new nodes added.
- **nodes** (array of strings) - The current list of registered nodes.

#### Response Example
```json
{
  "message": "2 new nodes have been added: http://localhost:5001, http://localhost:5002",
  "nodes": ["http://localhost:5000", "http://localhost:5001", "http://localhost:5002"]
}
```

## GET /nodes/resolve

### Description
Initiates the consensus algorithm to resolve any chain conflicts across the network. It ensures that all nodes have the longest valid chain.

### Method
GET

### Endpoint
/nodes/resolve

### Parameters
None

### Request Example
(No request body or parameters for this GET request)

### Response
#### Success Response (200)
- **message** (string) - Indicates whether the chain was replaced or is already authoritative.
- **chain** (array of objects) - The current valid chain adopted by the node.

#### Response Example
```json
{
  "message": "Our chain is authoritive",
  "chain": [
    {
      "index": 1,
      "timestamp": 1500000000.0,
      "transactions": [],
      "proof": 100,
      "previous_hash": "1"
    }
  ]
}
```
```

--------------------------------

### Transaction and Block Creation

Source: https://context7.com/dvf/blockchain/llms.txt

APIs for creating new transactions and mining new blocks.

```APIDOC
## POST /transactions/new

### Description
Creates a new transaction to be included in the next mined block.

### Method
POST

### Endpoint
/transactions/new

### Parameters
#### Query Parameters
None

#### Request Body
- **sender** (string) - Required - The address of the transaction sender.
- **recipient** (string) - Required - The address of the transaction recipient.
- **amount** (number) - Required - The amount to be transferred.

### Request Example
```json
{
  "sender": "sender_address",
  "recipient": "recipient_address",
  "amount": 50
}
```

### Response
#### Success Response (200)
- **message** (string) - Confirmation message indicating that the transaction will be included in a block.
- **index** (number) - The index of the block where the transaction will be included.

#### Response Example
```json
{
  "message": "Transaction will be in block 2"
}
```

## GET /mine

### Description
Mines a new block containing any pending transactions and adds it to the chain. This process involves finding a valid proof-of-work.

### Method
GET

### Endpoint
/mine

### Parameters
None

### Request Example
(No request body or parameters for this GET request)

### Response
#### Success Response (200)
- **message** (string) - Confirmation message indicating a new block has been forged.
- **index** (number) - The index of the newly mined block.
- **transactions** (array of objects) - The list of transactions included in the new block.
- **proof** (number) - The proof-of-work number found for this block.
- **previous_hash** (string) - The hash of the previous block in the chain.

#### Response Example
```json
{
  "message": "New Block Forged",
  "index": 2,
  "transactions": [
    {
      "sender": "sender_address",
      "recipient": "recipient_address",
      "amount": 50
    }
  ],
  "proof": 35293,
  "previous_hash": "0000abcde12345..."
}
```
```

--------------------------------

### Mine a New Block

Source: https://context7.com/dvf/blockchain/llms.txt

Performs proof-of-work mining to create a new block. The miner receives a reward of 1 coin for successfully mining the block. Returns the newly forged block with its index, transactions, proof, and previous hash.

```APIDOC
## POST /mine

### Description
Performs proof-of-work mining to create a new block. The miner receives a reward of 1 coin for successfully mining the block.

### Method
GET

### Endpoint
/mine

### Parameters
#### Query Parameters
None

#### Request Body
None

### Request Example
```bash
curl http://localhost:5000/mine
```

### Response
#### Success Response (200)
- **message** (string) - Confirmation message.
- **index** (integer) - The index of the newly mined block.
- **transactions** (array) - A list of transactions included in the new block.
- **proof** (integer) - The proof-of-work value for the new block.
- **previous_hash** (string) - The hash of the previous block.

#### Response Example
```json
{
  "message": "New Block Forged",
  "index": 2,
  "transactions": [
    {
      "sender": "0",
      "recipient": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
      "amount": 1
    }
  ],
  "proof": 35293,
  "previous_hash": "a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456"
}
```
```

--------------------------------

### Chain Information

Source: https://context7.com/dvf/blockchain/llms.txt

APIs for retrieving the current state of the blockchain.

```APIDOC
## GET /chain

### Description
Retrieves the entire blockchain, including all blocks and their contents.

### Method
GET

### Endpoint
/chain

### Parameters
None

### Request Example
(No request body or parameters for this GET request)

### Response
#### Success Response (200)
- **chain** (array of objects) - An array representing the blockchain, where each object is a block.
- **length** (number) - The current number of blocks in the chain.

#### Response Example
```json
{
  "chain": [
    {
      "index": 1,
      "timestamp": 1500000000.0,
      "transactions": [],
      "proof": 100,
      "previous_hash": "1"
    },
    {
      "index": 2,
      "timestamp": 1500000100.0,
      "transactions": [
        {
          "sender": "sender_address",
          "recipient": "recipient_address",
          "amount": 50
        }
      ],
      "proof": 35293,
      "previous_hash": "0000abcde12345..."
    }
  ],
  "length": 2
}
```
```

--------------------------------

### Mine New Block - REST API

Source: https://context7.com/dvf/blockchain/llms.txt

Initiates proof-of-work mining to create a new block. The miner receives a reward, and the new block includes its index, transactions, proof, and previous hash. This is a core operation for adding new data to the blockchain.

```bash
# Mine a new block (triggers proof-of-work algorithm)
curl http://localhost:5000/mine

# Response:
{
  "message": "New Block Forged",
  "index": 2,
  "transactions": [
    {
      "sender": "0",
      "recipient": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
      "amount": 1
    }
  ],
  "proof": 35293,
  "previous_hash": "a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456"
}
```

--------------------------------

### Python Blockchain Class Implementation

Source: https://context7.com/dvf/blockchain/llms.txt

The core Python implementation of the blockchain, including methods for block creation, transaction management, proof-of-work mining, and consensus. Initializing the class automatically creates the genesis block.

```python
from blockchain import Blockchain

# Create a new blockchain instance (genesis block created automatically)
blockchain = Blockchain()

# Add a new transaction
block_index = blockchain.new_transaction(
    sender="sender_address_here",
    recipient="recipient_address_here",
    amount=100
)
print(f"Transaction will be added to block {block_index}")

# Mine a new block using proof-of-work
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
print(f"New block mined: index={block['index']}, proof={block['proof']}")
```

--------------------------------

### Create a New Transaction

Source: https://context7.com/dvf/blockchain/llms.txt

Submits a new transaction to be included in the next mined block. Requires sender address, recipient address, and amount. Returns the block index where the transaction will be recorded.

```APIDOC
## POST /transactions/new

### Description
Submits a new transaction to be included in the next mined block.

### Method
POST

### Endpoint
/transactions/new

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **sender** (string) - Required - The address of the transaction sender.
- **recipient** (string) - Required - The address of the transaction recipient.
- **amount** (integer) - Required - The amount to be transferred.

### Request Example
```json
{
  "sender": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
  "recipient": "a1b2c3d4e5f6789012345678abcdef12",
  "amount": 5
}
```

### Response
#### Success Response (200)
- **message** (string) - Confirmation message indicating the block index where the transaction will be added.

#### Response Example
```json
{
  "message": "Transaction will be added to Block 3"
}
```
```

--------------------------------

### C# Blockchain Class Operations

Source: https://context7.com/dvf/blockchain/llms.txt

A .NET blockchain implementation with REST API support. It allows creating transactions, mining blocks, retrieving the full chain, registering nodes, and running the consensus algorithm.

```csharp
using BlockChainDemo;
using Newtonsoft.Json;

var blockchain = new BlockChain();

int blockIndex = blockchain.CreateTransaction(
    sender: "sender_address",
    recipient: "recipient_address",
    amount: 50
);
Console.WriteLine($"Transaction will be in block {blockIndex}");

string mineResult = blockchain.Mine();
Console.WriteLine(mineResult);

string chainJson = blockchain.GetFullChain();
Console.WriteLine(chainJson);

string[] nodes = { "localhost:5001", "localhost:5002" };
string registerResult = blockchain.RegisterNodes(nodes);
Console.WriteLine(registerResult);

string consensusResult = blockchain.Consensus();
Console.WriteLine(consensusResult);

var webServer = new WebServer(blockchain);
```

--------------------------------

### JavaScript Blockchain Class Operations

Source: https://context7.com/dvf/blockchain/llms.txt

Implements a Node.js blockchain using the crypto module. Supports adding peers, creating new blocks, mining with proof-of-work (default and custom difficulty), and hashing blocks.

```javascript
const Blockchain = require('./blockchain');

const blockchain = new Blockchain();

blockchain.addPeer('192.168.0.5:5000');
console.log('Peers:', blockchain.getPeers());

const lastBlock = blockchain.lastBlock();
console.log('Last block:', lastBlock);

blockchain.newBlock(lastBlock.hash);
console.log('New block created, chain length:', blockchain.chain.length);

const minedBlock = blockchain.mine();
console.log('Mined block hash:', minedBlock.hash);
console.log('Nonce:', minedBlock.nonce);

const easierBlock = blockchain.mine(null, 2);

const hash = Blockchain.hash(lastBlock);
console.log('Block hash:', hash);

const isValid = Blockchain.powIsAcceptable(hash, 4);
console.log('POW valid:', isValid);

const nonce = Blockchain.nonce();
console.log('Random nonce:', nonce);
```

--------------------------------

### Create New Transaction - REST API

Source: https://context7.com/dvf/blockchain/llms.txt

Submits a new transaction to be included in the next mined block. It requires sender, recipient, and amount, and returns the index of the block where the transaction will be added. This is fundamental for recording value transfers.

```bash
# Create a new transaction
curl -X POST -H "Content-Type: application/json" -d '{
  "sender": "d4ee26eee15c4b8a9c586b0e1e2d3f4a",
  "recipient": "a1b2c3d4e5f6789012345678abcdef12",
  "amount": 5
}' http://localhost:5000/transactions/new

# Response:
{
  "message": "Transaction will be added to Block 3"
}
```

--------------------------------

### Resolve Conflicts (Consensus)

Source: https://context7.com/dvf/blockchain/llms.txt

Implements the consensus algorithm by querying all registered nodes and replacing the local chain with the longest valid chain found in the network. This is how blockchain nodes agree on the authoritative state.

```APIDOC
## GET /nodes/resolve

### Description
Implements the consensus algorithm to synchronize the local chain with the longest chain in the network.

### Method
GET

### Endpoint
/nodes/resolve

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```bash
curl http://localhost:5000/nodes/resolve
```

### Response
#### Success Response (200)
- **message** (string) - Indicates if the chain was replaced or if the local chain is authoritative.
- **new_chain** (array) - The new, longer chain if the local chain was replaced.
- **chain** (array) - The local chain if it was already the longest.

#### Response Example (Chain Replaced)
```json
{
  "message": "Our chain was replaced",
  "new_chain": [...] 
}
```

#### Response Example (Local Chain Authoritative)
```json
{
  "message": "Our chain is authoritative",
  "chain": [...] 
}
```
```

--------------------------------

### Resolve Conflicts (Consensus) - REST API

Source: https://context7.com/dvf/blockchain/llms.txt

Implements the consensus algorithm by querying all registered nodes to find and adopt the longest valid chain. This ensures all nodes agree on the authoritative state of the blockchain.

```bash
# Resolve conflicts and synchronize with the network
curl http://localhost:5000/nodes/resolve

# Response when chain was replaced:
{
  "message": "Our chain was replaced",
  "new_chain": [...] 
}

# Response when local chain is authoritative:
{
  "message": "Our chain is authoritative",
  "chain": [...] 
}
```

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