Could you clarify what you mean by “BTC script”? Are you referring to:
1. Bitcoin Script – the low-level programming language used in Bitcoin transactions (used to define conditions for spending BTC)?
2. A trading bot script for Bitcoin (e.g., in Python)?
3. A script to monitor BTC price or wallet balances?
4. A mining script?
5. Something else?
Let me know what you’re looking for so I can help you better.
Great! Here’s a breakdown of different BTC-related scripts across categories. Let me know which ones you'd like in more detail or need help with setting up:
1. Bitcoin Script (Scripting Language Used in Transactions)
Bitcoin uses a stack-based, Forth-like language for writing locking (scriptPubKey) and unlocking (scriptSig) scripts.
Example: Pay-to-PubKey-Hash (P2PKH) Script
• Locking Script (scriptPubKey):
• OP_DUP OP_HASH160 <PubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
• Unlocking Script (scriptSig):
• <Signature> <PublicKey>
This script structure verifies that the spender has the correct private key.
2. BTC Price Monitor (Python Script)
Here’s a simple Python script to get real-time BTC prices using an API:
import requests
def get_btc_price():
url = "https://api.coindesk.com/v1/bpi/currentprice/BTC.json"
response = requests.get(url)
data = response.json()
price = data['bpi']['USD']['rate']
print(f"Current BTC Price: ${price}")
get_btc_price()
3. BTC Trading Bot Script (Python + CCXT)
Install the ccxt library:
pip install ccxt
Basic market buy example (Binance):
import ccxt
exchange = ccxt.binance({
'apiKey': 'YOUR_API_KEY',
'secret': 'YOUR_API_SECRET',
})
symbol = 'BTC/USDT'
amount = 0.001 # BTC amount to buy
order = exchange.create_market_buy_order(symbol, amount)
print(order)
4. BTC Wallet Balance Checker (Python + bitcoinlib)
Install:
pip install bitcoinlib
Code:
from bitcoinlib.wallets import Wallet
wallet = Wallet.create('MyTestWallet')
print(wallet.info())
5. Bitcoin Mining Script (for educational purposes)
Basic conceptual script (not profitable or practical):
import hashlib
import time
def mine(block_number, transactions, previous_hash, prefix_zeros):
prefix_str = '0'*prefix_zeros
nonce = 0
while True:
text = str(block_number) + transactions + previous_hash + str(nonce)
new_hash = hashlib.sha256(text.encode()).hexdigest()
if new_hash.startswith(prefix_str):
print(f"Successfully mined with nonce: {nonce}")
return new_hash
nonce += 1
mine(1, 'tx1', '0000000000000000', 4)
Want me to build out one of these into a full project, or are you interested in something more specific like smart contract-like scripting (via Bitcoin Script or Taproot)?
Nice—let’s dive into Bitcoin Script, the low-level language used in Bitcoin transactions.
What is Bitcoin Script?
• A stack-based, non-Turing-complete language.
• Used to define the spending conditions of a transaction output.
• Scripts come in two parts:
o scriptPubKey (locking script): defines how the BTC can be spent.
o scriptSig (unlocking script): provides the data to satisfy the scriptPubKey.
Common Bitcoin Script Types
1. Pay-to-PubKey-Hash (P2PKH)
Most common type.
• scriptPubKey (output):
• OP_DUP OP_HASH160 <PubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
• scriptSig (input):
• <Signature> <PublicKey>
How it works:
1. OP_DUP duplicates the public key.
2. OP_HASH160 hashes it (RIPEMD160(SHA256)).
3. Compares it to <PubKeyHash>.
4. Verifies the signature with OP_CHECKSIG.
2. Pay-to-Script-Hash (P2SH)
More flexible: locks funds to a script hash.
• scriptPubKey:
• OP_HASH160 <ScriptHash> OP_EQUAL
• scriptSig:
• <Data...> <RedeemScript>
This allows complex conditions (like multisig) to be hidden behind a simple hash.
3. Multisig Script
e.g., 2-of-3 multisig
• scriptPubKey:
• OP_2 <PubKey1> <PubKey2> <PubKey3> OP_3 OP_CHECKMULTISIG
• scriptSig:
• OP_0 <Signature1> <Signature2>
(OP_0 is a quirk in OP_CHECKMULTISIG implementation.)
Script Execution Model
Bitcoin Script runs like a stack calculator:
• Push values or operations.
• Operations manipulate the stack.
• If the final result is true, the transaction is valid.
Script Examples in Hex
A basic P2PKH output script might look like:
76a914<PubKeyHash>88ac
Where:
• 76 = OP_DUP
• a9 = OP_HASH160
• 14 = 20-byte push
• 88 = OP_EQUALVERIFY
• ac = OP_CHECKSIG
Want to Try It Out?
You can simulate Bitcoin scripts using tools like:
• BitcoinJS Playground
• Script Debugger
• Or even write a simple interpreter i
n Python.
Want a hands-on demo of how a Bitcoin Script runs step-by-step, or a Python simulation of how the stack gets evaluated?
