# Blockchain Node – Task Breakdown

## Status (2025-12-22)

- **Stage 1**: ✅ **DEPLOYED** - Blockchain Node successfully deployed on host with RPC API accessible
  - SQLModel-based blockchain with PoA consensus implemented
  - RPC API running on port 9080 (proxied via /rpc/)
  - Mock coordinator on port 8090 (proxied via /v1/)
  - Devnet scripts and observability hooks implemented
  - Note: SQLModel/SQLAlchemy compatibility issues remain (low priority)

## Stage 1 (MVP) - COMPLETED

- **Project Scaffolding**
  - ✅ Create `apps/blockchain-node/src/` module layout (`types.py`, `state.py`, `blocks.py`, `mempool.py`, `consensus.py`, `rpc.py`, `p2p.py`, `receipts.py`, `settings.py`).
  - ✅ Add `requirements.txt` with FastAPI, SQLModel, websockets, orjson, python-dotenv.
  - ✅ Provide `.env.example` with `CHAIN_ID`, `DB_PATH`, bind addresses, proposer key.

- **State & Persistence**
  - ✅ Implement SQLModel tables for blocks, transactions, accounts, receipts, peers, params.
  - ✅ Set up database initialization and genesis loading.
  - ✅ Provide migration or reset script under `scripts/`.

- **RPC Layer**
  - ✅ Build FastAPI app exposing `/rpc/*` endpoints (sendTx, getTx, getBlock, getHead, getBalance, submitReceipt, metrics).
  - ✅ Implement admin endpoints for devnet (`mintFaucet`, `paramSet`, `peers/add`).

- **Consensus & Block Production**
  - ✅ Implement PoA proposer loop producing blocks at fixed interval.
  - ✅ Integrate mempool selection, receipt validation, and block broadcasting.
  - ✅ Add basic P2P gossip (websocket) for blocks/txs.

- **Receipts & Minting**
  - ✅ Wire `receipts.py` to coordinator attestation mock.
  - ✅ Mint tokens to miners based on compute_units with configurable ratios.

- **Devnet Tooling**
  - ✅ Provide `scripts/devnet_up.sh` launching bootstrap node and mocks.
  - ✅ Document curl commands for faucet, transfer, receipt submission.

## Production Deployment Details

- **Host**: Running on host machine (GPU access required)
- **Service**: systemd services for blockchain-node, blockchain-rpc, mock-coordinator
- **Ports**: 9080 (RPC), 8090 (Mock Coordinator)
- **Proxy**: nginx routes /rpc/ and /v1/ to host services
- **Access**: https://aitbc.bubuit.net/rpc/ for blockchain RPC
- **Database**: SQLite with SQLModel ORM
- **Issues**: SQLModel/SQLAlchemy compatibility (low priority)

## Stage 2+ - IN PROGRESS

- 🔄 Upgrade consensus to compute-backed proof (CBP) with work score weighting.
- 🔄 Introduce staking/slashing, replace SQLite with PostgreSQL, add snapshots/fast sync.
- 🔄 Implement light client support and metrics dashboard.