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Here is an article on how to use PyCoin, a popular command-line tool for interacting with Ethereum smart contracts, to perform transactions without knowing the public key (address).

Ethereum Transactions: A Quick Guide

When working with Ethereum smart contracts, you will often need to send or receive funds. In this article, we will explore how to use PyCoin, a command-line utility, to perform these transactions.

Prerequisites

Before diving into PyCoin, make sure you have:

• The pycryptodome and pyopenssl packages installed on your system:

sudo apt-get update
sudo apt-get install python3-pycryptodome python3-pyopenssl

• A compatible Ethereum wallet (e.g., Ledger, Trezor, or hardware wallet).

Installing PyCoin

You can install PyCoin using pip, the Python package manager:

sudo pip install pycoin

Basic Transaction Syntax

PyCoin supports various types of transactions, including:

• send to send funds from one address to another.

• receive to receive funds from an address.

Here are some basic examples of PyCoin transactions:

import pycoin as pyc





Create a new wallet (replace it with your current wallet)
pyw = pyc.Wallet()

Get the sender's public key and destination address
sender_pubkey = '0x1234567890abcdef'
destination_pubkey = '0x234567890abfedcba'

Send funds from sender to recipient
tx = pyc.send(sender_pubkey, destination_pubkey, amount=10)

Using PyCoin with a command line utility

To perform transactions using PyCoin from a command line utility like pycoin, follow these steps:

• Install PyCoin:

sudo pip install pycoin

• Create a new wallet (replace it with your current wallet):

pyw = pyc.Wallet()

• Get the sender’s public key and destination address:

sender_pubkey = '0x1234567890abcdef'
destination_pubkey = '0x234567890abfedcba'

• Use PyCoin to send funds from the sender to the recipient:

pycoin --wallet=pyw --txid=your_tx_id --address=recipient_address --amount=10 --signing=sign_with_exponent --signing_secret=

Replace the placeholder with your wallet details, transaction ID, address, amount and signature secret.

Example Use Cases

Here are more examples to illustrate how to use PyCoin:

• Send funds from one sender to multiple recipients:

sender_pubkey = '0x1234567890abcdef'
destination_pubkeys = ['0x234567890abfedcba1', '0x234567890abfedcba2']
txs = [
{'txid': 'your_tx_id', 'signing': ''},
{'txid': 'your_tx_id_2', 'signing': ''}
]
for tx in txs:
pyc.send(sender_pubkey, destination_pubkeys[tx['signing']], amount=10)

• Receive funds from multiple addresses:

sender_pubkey = '0x1234567890abcdef'
addresses = ['0x234567890abfedcba1', '0x234567890abfedcba2']
txs = [
{'txid': 'your_tx_id_3', 'signing': ''},
{'txid': 'your_tx_id_4', 'signing': ''}
]
for tx in txs:
pyc.receive(sender_pubkey, addresses[tx['signing']], amount=10)

Remember to replace the placeholders with your actual wallet data and transaction IDs.

I hope this article helps you get started with PyCoin from a command line utility!

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