LogStore blockchain integration

This folder contains a simple Solidity contract LogStore.sol and Python tools to compile, deploy, and interact with it via Web3 and a FastAPI wrapper.

Files added:

• LogStore.sol - Solidity contract storing logs
• deploy.py - compile & deploy to testnet
• send_log.py - sign & send addLog transactions
• app.py - FastAPI app exposing endpoints (needs CONTRACT_ADDRESS set)
• requirements.txt - Python dependencies
• .env.example - example env variables

Quick start (PowerShell):

1. Create virtual env and install:

python -m venv .venv; .\.venv\Scripts\Activate.ps1; pip install -r requirements.txt

2. Copy .env.example -> .env and fill RPC_URL and PRIVATE_KEY. For Sepolia use Infura or Alchemy RPC.

3. Deploy contract:

python deploy.py

This prints the deployed address. Save it to .env as CONTRACT_ADDRESS and also writes ABI file manually if needed.

4. Run FastAPI server:

$env:CONTRACT_ADDRESS="0x..."; uvicorn app:app --reload

5. Send a log via script:

python send_log.py "Test message"

Notes:

• Keep your private key secret. For production use a secure signer or a wallet.
• ABI is expected at LogStore.abi.json after compile; deploy.py prints ABI and address.