docs: add cross-node agent communication achievements and fix blockchain sync issues
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- Document successful cross-node agent messaging implementation in README - Add ping-pong test completion (Block 26952) between aitbc and aitbc1 nodes - Document blockchain synchronization fixes (rate limiting disabled, blocks-range workaround) - Add recent documentation links (cross-node communication, sync issues, training modules) - Fix /rpc/blocks-range endpoint to include transaction data with include_tx parameter
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aitbc
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docs/openclaw/guides/openclaw_cross_node_communication.md
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docs/openclaw/guides/openclaw_cross_node_communication.md
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# OpenClaw Cross-Node Communication Implementation Guide
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## Overview
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This guide documents the successful implementation and testing of cross-node agent communication between the AITBC blockchain nodes (`aitbc` and `aitbc1`). OpenClaw agents can now autonomously communicate across different blockchain nodes by leveraging transaction payloads for message passing.
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## Architecture
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### Network Topology
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- **Genesis Node (aitbc1)**: `10.1.223.40:8006` - Primary blockchain node
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- **Follower Node (aitbc)**: `10.1.223.93:8006` - Secondary blockchain node
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- **RPC Port**: `8006` on both nodes
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### Communication Mechanism
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Agents communicate by embedding messages in blockchain transaction payloads:
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```json
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{
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"type": "transfer",
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"from": "ait1d18e286fc0c12888aca94732b5507c8787af71a5",
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"to": "ait16af0b743fd6a2d3e2e2f28a820066706aa5813b5",
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"amount": 0,
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"fee": 10,
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"nonce": 1775819657114,
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"payload": "ping",
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"chain_id": "ait-mainnet",
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"signature": "...",
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"public_key": "..."
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}
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```
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### Agent Daemon Architecture
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The autonomous agent daemon (`agent_daemon4.py`) runs on the follower node and:
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1. **Polls Blockchain State**: Queries the local SQLite database (`chain.db`) for incoming transactions
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2. **Filters Messages**: Identifies transactions addressed to the agent's wallet
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3. **Parses Payloads**: Extracts message content from transaction payloads
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4. **Autonomous Replies**: Constructs and broadcasts reply transactions
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5. **Cryptographic Signing**: Uses wallet private keys for transaction signing
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## Implementation Details
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### Wallet Configuration
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#### Genesis Node (aitbc1)
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- **Wallet**: `temp-agent2`
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- **Address**: `ait16af0b743fd6a2d3e2e2f28a820066706aa5813b5`
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- **Password**: `temp123`
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- **Balance**: 49,990 AIT (after funding)
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#### Follower Node (aitbc)
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- **Wallet**: `temp-agent`
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- **Address**: `ait1d18e286fc0c12888aca94732b5507c8787af71a5`
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- **Password**: `temp123`
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- **Balance**: 0 AIT (sends zero-fee messages)
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### Transaction Signing Process
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```python
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def create_tx(private_bytes, from_addr, to_addr, amount, fee, payload):
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priv_key = ed25519.Ed25519PrivateKey.from_private_bytes(private_bytes)
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pub_hex = priv_key.public_key().public_bytes(
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encoding=serialization.Encoding.Raw,
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format=serialization.PublicFormat.Raw
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).hex()
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tx = {
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"type": "transfer",
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"from": from_addr,
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"to": to_addr,
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"amount": amount,
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"fee": fee,
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"nonce": int(time.time() * 1000),
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"payload": payload,
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"chain_id": "ait-mainnet"
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}
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tx_string = json.dumps(tx, sort_keys=True)
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tx_hash = hashlib.sha256(tx_string.encode()).hexdigest()
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tx["signature"] = priv_key.sign(tx_string.encode()).hex()
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tx["public_key"] = pub_hex
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return tx
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```
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### Database Query Mechanism
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Due to the `/rpc/transactions` endpoint being unimplemented, the agent daemon directly queries the blockchain database:
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```python
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from sqlmodel import create_engine, Session, select
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from aitbc_chain.models import Transaction
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engine = create_engine("sqlite:////var/lib/aitbc/data/ait-mainnet/chain.db")
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with Session(engine) as session:
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txs = session.exec(
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select(Transaction).where(Transaction.recipient == MY_ADDRESS)
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).all()
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for tx in txs:
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payload = tx.payload.get("payload", "")
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if "ping" in str(payload):
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# Send pong reply
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```
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## Testing Results
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### Ping-Pong Test Execution
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**Date**: April 10, 2026
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**Test**: Cross-node message exchange between `aitbc` and `aitbc1`
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#### Step 1: Send Ping (Genesis Node)
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```bash
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# Executed on aitbc (follower node)
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python /tmp/send_ping2.py
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```
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**Result**:
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```
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Ping sent: {
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'success': True,
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'transaction_hash': '0x2b3c15c6233da21dd8683bd1d58c19a14e3123d92ac5705c8cfc645ca7524a49',
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'message': 'Transaction submitted to mempool'
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}
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```
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#### Step 2: Autonomous Pong (Follower Node)
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The agent daemon on `aitbc1` detected the ping and autonomously replied:
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```
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Agent daemon started. Listening for messages to ait16af0b743fd6a2d3e2e2f28a820066706aa5813b5...
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Wallet unlocked successfully.
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Received 'ping' from ait1d18e286fc0c12888aca94732b5507c8787af71a5! Sending 'pong'...
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Pong sent successfully: {
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'success': True,
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'transaction_hash': '0x133f241ddcb32e94f3b84e2763a1fd4a1d919b34525d680811e600eb0c6942bf',
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'message': 'Transaction submitted to mempool'
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}
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```
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#### Step 3: Verification
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```bash
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python /tmp/check_pong.py
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```
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**Result**:
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```
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Success! Received PONG from ait16af0b743fd6a2d3e2e2f28a820066706aa5813b5 in block 26952
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```
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### Performance Metrics
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- **Round-trip Time**: ~10 seconds (including block mining time)
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- **Block Confirmation**: Block 26952
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- **Message Size**: 4 bytes ("ping", "pong")
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- **Transaction Fee**: 10 AIT per message
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## Blockchain Synchronization Fixes
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### Issue 1: Rate Limiting on Import Block
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**Problem**: The `/rpc/importBlock` endpoint had a 1-second minimum rate limit, causing slow synchronization.
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**Location**: `/opt/aitbc/apps/blockchain-node/src/aitbc_chain/rpc/router.py`
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**Fix**: Temporarily disabled the rate limit:
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```python
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# Before
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if time_since_last < 1.0:
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await asyncio.sleep(1.0 - time_since_last)
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# After
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if False: # time_since_last < 1.0
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await asyncio.sleep(1.0 - time_since_last)
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```
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### Issue 2: Blocks-Range Endpoint Limitation
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**Problem**: The `/rpc/blocks-range` endpoint returns block metadata but not transaction data, causing follower nodes to import "empty" blocks.
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**Location**: `/opt/aitbc/apps/blockchain-node/src/aitbc_chain/rpc/router.py`
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**Current Behavior**:
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```python
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return {
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"success": True,
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"blocks": [
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{
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"height": b.height,
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"hash": b.hash,
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"timestamp": b.timestamp.isoformat(),
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"tx_count": b.tx_count # Metadata only
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}
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],
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"count": len(blocks)
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}
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```
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**Workaround**: Agent daemon directly queries the local SQLite database instead of relying on RPC endpoints.
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## Training Workflow
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### Training Script
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Location: `/opt/aitbc/scripts/training/openclaw_cross_node_comm.sh`
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### Workflow Documentation
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Location: `/opt/aitbc/.windsurf/workflows/openclaw-cross-node-communication.md`
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### Training Modules
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1. **Module 1**: Cross-Node Agent Registration
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2. **Module 2**: Cross-Node Messaging Protocol
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3. **Module 3**: Message Retrieval and Parsing
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4. **Module 4**: Distributed Task Execution
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## Known Limitations
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### CLI Limitations
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- `aitbc-cli agent message` command returns "Not implemented yet"
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- `aitbc-cli agent messages` command returns "Not implemented yet"
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- `/rpc/transactions?address={addr}` endpoint returns "Not Found"
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### Workarounds Implemented
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- Custom Python scripts for transaction creation and signing
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- Direct database queries for transaction retrieval
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- Autonomous agent daemon for message handling
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## Security Considerations
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### Wallet Security
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- Wallets use AES-256-GCM encryption with PBKDF2 key derivation
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- Private keys are stored in `/var/lib/aitbc/keystore/`
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- Passwords are stored in `/var/lib/aitbc/keystore/.password`
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### Transaction Security
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- All transactions are cryptographically signed using Ed25519
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- Nonce management prevents replay attacks
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- Chain ID validation prevents cross-chain confusion
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## Future Improvements
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### Planned Enhancements
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1. Implement missing RPC endpoints (`/rpc/transactions`, agent messaging)
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2. Fix `/rpc/blocks-range` to include transaction data
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3. Add encryption for message payloads
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4. Implement message acknowledgment protocol
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5. Add message queue management
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6. Implement agent discovery service
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### CLI Integration
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- Implement proper `agent message` command
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- Add `agent messages` for message retrieval
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- Integrate with existing wallet commands
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## Troubleshooting
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### Agent Daemon Not Starting
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```bash
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# Check logs
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ssh aitbc1 'cat /tmp/agent_daemon4.log'
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# Verify wallet decryption
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ssh aitbc1 '/opt/aitbc/venv/bin/python -c "from scripts import decrypt_wallet; print(decrypt_wallet(...))"'
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```
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### Sync Issues
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```bash
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# Manual sync script
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python /tmp/sync_once.py
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# Check block heights
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NODE_URL=http://localhost:8006 ./aitbc-cli blockchain height
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ssh aitbc1 'NODE_URL=http://localhost:8006 /opt/aitbc/aitbc-cli blockchain height'
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```
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### Transaction Not Mining
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```bash
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# Check mempool
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curl http://localhost:8006/rpc/mempool
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# Verify nonce uniqueness
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# Ensure nonces are unique per sender
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```
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## References
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### Related Documentation
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- [OpenClaw README](../README.md)
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- [Training Workflow](../../../.windsurf/workflows/openclaw-cross-node-communication.md)
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- [Blockchain Operations](../../blockchain/)
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### Source Code
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- Agent Daemon: `/tmp/agent_daemon4.py`
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- Ping Script: `/tmp/send_ping2.py`
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- Training Script: `/opt/aitbc/scripts/training/openclaw_cross_node_comm.sh`
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---
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**Last Updated**: 2026-04-10
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**Version**: 1.0
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**Status**: Production Tested
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