diff --git a/aitbc/__init__.py b/aitbc/__init__.py
index 95762d33..ca7bcb2a 100644
--- a/aitbc/__init__.py
+++ b/aitbc/__init__.py
@@ -61,8 +61,52 @@ from .json_utils import (
     flatten_json,
 )
 from .http_client import AITBCHTTPClient
+from .config import BaseAITBCConfig, AITBCConfig
+from .decorators import (
+    retry,
+    timing,
+    cache_result,
+    validate_args,
+    handle_exceptions,
+    async_timing,
+)
+from .validation import (
+    validate_address,
+    validate_hash,
+    validate_url,
+    validate_port,
+    validate_email,
+    validate_non_empty,
+    validate_positive_number,
+    validate_range,
+    validate_chain_id,
+    validate_uuid,
+)
+from .async_helpers import (
+    run_sync,
+    gather_with_concurrency,
+    run_with_timeout,
+    batch_process,
+    sync_to_async,
+    async_to_sync,
+    retry_async,
+    wait_for_condition,
+)
+from .database import (
+    DatabaseConnection,
+    get_database_connection,
+    ensure_database,
+    vacuum_database,
+    get_table_info,
+    table_exists,
+)
+from .monitoring import (
+    MetricsCollector,
+    PerformanceTimer,
+    HealthChecker,
+)
 
-__version__ = "0.4.0"
+__version__ = "0.6.0"
 __all__ = [
     # Logging
     "get_logger",
@@ -120,4 +164,45 @@ __all__ = [
     "flatten_json",
     # HTTP client
     "AITBCHTTPClient",
+    # Configuration
+    "BaseAITBCConfig",
+    "AITBCConfig",
+    # Decorators
+    "retry",
+    "timing",
+    "cache_result",
+    "validate_args",
+    "handle_exceptions",
+    "async_timing",
+    # Validators
+    "validate_address",
+    "validate_hash",
+    "validate_url",
+    "validate_port",
+    "validate_email",
+    "validate_non_empty",
+    "validate_positive_number",
+    "validate_range",
+    "validate_chain_id",
+    "validate_uuid",
+    # Async helpers
+    "run_sync",
+    "gather_with_concurrency",
+    "run_with_timeout",
+    "batch_process",
+    "sync_to_async",
+    "async_to_sync",
+    "retry_async",
+    "wait_for_condition",
+    # Database
+    "DatabaseConnection",
+    "get_database_connection",
+    "ensure_database",
+    "vacuum_database",
+    "get_table_info",
+    "table_exists",
+    # Monitoring
+    "MetricsCollector",
+    "PerformanceTimer",
+    "HealthChecker",
 ]
diff --git a/aitbc/async_helpers.py b/aitbc/async_helpers.py
new file mode 100644
index 00000000..54216147
--- /dev/null
+++ b/aitbc/async_helpers.py
@@ -0,0 +1,190 @@
+"""
+AITBC Async Helpers
+Async utilities for AITBC applications
+"""
+
+import asyncio
+from typing import Coroutine, Any, List, TypeVar, Callable
+from functools import wraps
+
+T = TypeVar('T')
+
+
+async def run_sync(coro: Coroutine[Any, Any, T]) -> T:
+    """
+    Run a coroutine from synchronous code.
+    
+    Args:
+        coro: Coroutine to run
+        
+    Returns:
+        Result of the coroutine
+    """
+    return await asyncio.create_task(coro)
+
+
+async def gather_with_concurrency(
+    coros: List[Coroutine[Any, Any, T]],
+    limit: int = 10
+) -> List[T]:
+    """
+    Gather coroutines with concurrency limit.
+    
+    Args:
+        coros: List of coroutines to execute
+        limit: Maximum concurrent coroutines
+        
+    Returns:
+        List of results from all coroutines
+    """
+    semaphore = asyncio.Semaphore(limit)
+    
+    async def limited_coro(coro: Coroutine[Any, Any, T]) -> T:
+        async with semaphore:
+            return await coro
+    
+    limited_coros = [limited_coro(coro) for coro in coros]
+    return await asyncio.gather(*limited_coros)
+
+
+async def run_with_timeout(
+    coro: Coroutine[Any, Any, T],
+    timeout: float,
+    default: T = None
+) -> T:
+    """
+    Run a coroutine with a timeout.
+    
+    Args:
+        coro: Coroutine to run
+        timeout: Timeout in seconds
+        default: Default value if timeout occurs
+        
+    Returns:
+        Result of coroutine or default value on timeout
+    """
+    try:
+        return await asyncio.wait_for(coro, timeout=timeout)
+    except asyncio.TimeoutError:
+        return default
+
+
+async def batch_process(
+    items: List[Any],
+    process_func: Callable[[Any], Coroutine[Any, Any, T]],
+    batch_size: int = 10,
+    delay: float = 0.1
+) -> List[T]:
+    """
+    Process items in batches with delay between batches.
+    
+    Args:
+        items: Items to process
+        process_func: Async function to process each item
+        batch_size: Number of items per batch
+        delay: Delay between batches in seconds
+        
+    Returns:
+        List of results
+    """
+    results = []
+    for i in range(0, len(items), batch_size):
+        batch = items[i:i + batch_size]
+        batch_results = await asyncio.gather(*[process_func(item) for item in batch])
+        results.extend(batch_results)
+        
+        if i + batch_size < len(items):
+            await asyncio.sleep(delay)
+    
+    return results
+
+
+def sync_to_async(func: Callable) -> Callable:
+    """
+    Decorator to convert a synchronous function to async.
+    
+    Args:
+        func: Synchronous function to convert
+        
+    Returns:
+        Async wrapper function
+    """
+    @wraps(func)
+    async def wrapper(*args, **kwargs):
+        return func(*args, **kwargs)
+    return wrapper
+
+
+def async_to_sync(func: Callable) -> Callable:
+    """
+    Decorator to convert an async function to sync.
+    
+    Args:
+        func: Async function to convert
+        
+    Returns:
+        Synchronous wrapper function
+    """
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        return asyncio.run(func(*args, **kwargs))
+    return wrapper
+
+
+async def retry_async(
+    coro_func: Callable,
+    max_attempts: int = 3,
+    delay: float = 1.0,
+    backoff: float = 2.0
+) -> Any:
+    """
+    Retry an async coroutine with exponential backoff.
+    
+    Args:
+        coro_func: Function that returns a coroutine
+        max_attempts: Maximum retry attempts
+        delay: Initial delay in seconds
+        backoff: Multiplier for delay after each retry
+        
+    Returns:
+        Result of the coroutine
+    """
+    last_exception = None
+    current_delay = delay
+    
+    for attempt in range(max_attempts):
+        try:
+            return await coro_func()
+        except Exception as e:
+            last_exception = e
+            if attempt < max_attempts - 1:
+                await asyncio.sleep(current_delay)
+                current_delay *= backoff
+    
+    raise last_exception
+
+
+async def wait_for_condition(
+    condition: Callable[[], Coroutine[Any, Any, bool]],
+    timeout: float = 30.0,
+    check_interval: float = 0.5
+) -> bool:
+    """
+    Wait for a condition to become true.
+    
+    Args:
+        condition: Async function that returns a boolean
+        timeout: Maximum wait time in seconds
+        check_interval: Time between checks in seconds
+        
+    Returns:
+        True if condition became true, False if timeout
+    """
+    start_time = asyncio.get_event_loop().time()
+    
+    while asyncio.get_event_loop().time() - start_time < timeout:
+        if await condition():
+            return True
+        await asyncio.sleep(check_interval)
+    
+    return False
diff --git a/aitbc/config.py b/aitbc/config.py
new file mode 100644
index 00000000..d61f3261
--- /dev/null
+++ b/aitbc/config.py
@@ -0,0 +1,80 @@
+"""
+AITBC Configuration Classes
+Base configuration classes for AITBC applications
+"""
+
+from pathlib import Path
+from typing import Optional
+from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import Field
+
+from .constants import DATA_DIR, CONFIG_DIR, LOG_DIR, ENV_FILE
+
+
+class BaseAITBCConfig(BaseSettings):
+    """
+    Base configuration class for all AITBC applications.
+    Provides common AITBC-specific settings and environment file loading.
+    """
+    
+    model_config = SettingsConfigDict(
+        env_file=str(ENV_FILE),
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="ignore"
+    )
+    
+    # AITBC system directories
+    data_dir: Path = Field(default=DATA_DIR, description="AITBC data directory")
+    config_dir: Path = Field(default=CONFIG_DIR, description="AITBC configuration directory")
+    log_dir: Path = Field(default=LOG_DIR, description="AITBC log directory")
+    
+    # Application settings
+    app_name: str = Field(default="AITBC Application", description="Application name")
+    app_version: str = Field(default="1.0.0", description="Application version")
+    environment: str = Field(default="development", description="Environment (development/staging/production)")
+    debug: bool = Field(default=False, description="Debug mode")
+    
+    # Logging settings
+    log_level: str = Field(default="INFO", description="Log level (DEBUG/INFO/WARNING/ERROR/CRITICAL)")
+    log_format: str = Field(
+        default="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
+        description="Log format string"
+    )
+    
+    class Config:
+        """Pydantic configuration"""
+        env_file = str(ENV_FILE)
+        env_file_encoding = "utf-8"
+        case_sensitive = False
+
+
+class AITBCConfig(BaseAITBCConfig):
+    """
+    Standard AITBC configuration with common settings.
+    Inherits from BaseAITBCConfig and adds AITBC-specific fields.
+    """
+    
+    # Server settings
+    host: str = Field(default="0.0.0.0", description="Server host address")
+    port: int = Field(default=8000, description="Server port")
+    workers: int = Field(default=1, description="Number of worker processes")
+    
+    # Database settings
+    database_url: Optional[str] = Field(default=None, description="Database connection URL")
+    database_pool_size: int = Field(default=10, description="Database connection pool size")
+    
+    # Redis settings (if applicable)
+    redis_url: Optional[str] = Field(default=None, description="Redis connection URL")
+    redis_max_connections: int = Field(default=10, description="Redis max connections")
+    redis_timeout: int = Field(default=5, description="Redis timeout in seconds")
+    
+    # Security settings
+    secret_key: Optional[str] = Field(default=None, description="Application secret key")
+    jwt_secret: Optional[str] = Field(default=None, description="JWT secret key")
+    jwt_algorithm: str = Field(default="HS256", description="JWT algorithm")
+    jwt_expiration_hours: int = Field(default=24, description="JWT token expiration in hours")
+    
+    # Performance settings
+    request_timeout: int = Field(default=30, description="Request timeout in seconds")
+    max_request_size: int = Field(default=10 * 1024 * 1024, description="Max request size in bytes")
diff --git a/aitbc/database.py b/aitbc/database.py
new file mode 100644
index 00000000..d2d3a4c9
--- /dev/null
+++ b/aitbc/database.py
@@ -0,0 +1,261 @@
+"""
+AITBC Database Utilities
+Database connection and query utilities for AITBC applications
+"""
+
+import sqlite3
+from pathlib import Path
+from typing import Any, Dict, List, Optional, Tuple
+from contextlib import contextmanager
+from .exceptions import DatabaseError
+
+
+class DatabaseConnection:
+    """
+    Base database connection class for AITBC applications.
+    Provides common database operations with error handling.
+    """
+    
+    def __init__(self, db_path: Path, timeout: int = 30):
+        """
+        Initialize database connection.
+        
+        Args:
+            db_path: Path to database file
+            timeout: Connection timeout in seconds
+        """
+        self.db_path = db_path
+        self.timeout = timeout
+        self._connection = None
+    
+    def connect(self) -> sqlite3.Connection:
+        """
+        Establish database connection.
+        
+        Returns:
+            SQLite connection object
+            
+        Raises:
+            DatabaseError: If connection fails
+        """
+        try:
+            self._connection = sqlite3.connect(
+                self.db_path,
+                timeout=self.timeout
+            )
+            self._connection.row_factory = sqlite3.Row
+            return self._connection
+        except sqlite3.Error as e:
+            raise DatabaseError(f"Failed to connect to database: {e}")
+    
+    def close(self) -> None:
+        """Close database connection."""
+        if self._connection:
+            self._connection.close()
+            self._connection = None
+    
+    @contextmanager
+    def cursor(self):
+        """
+        Context manager for database cursor.
+        
+        Yields:
+            Database cursor
+        """
+        if not self._connection:
+            self.connect()
+        cursor = self._connection.cursor()
+        try:
+            yield cursor
+            self._connection.commit()
+        except Exception as e:
+            self._connection.rollback()
+            raise DatabaseError(f"Database operation failed: {e}")
+        finally:
+            cursor.close()
+    
+    async def execute(
+        self,
+        query: str,
+        params: Optional[Tuple[Any, ...]] = None
+    ) -> sqlite3.Cursor:
+        """
+        Execute a SQL query.
+        
+        Args:
+            query: SQL query string
+            params: Query parameters
+            
+        Returns:
+            Cursor object
+            
+        Raises:
+            DatabaseError: If query fails
+        """
+        try:
+            with self.cursor() as cursor:
+                if params:
+                    cursor.execute(query, params)
+                else:
+                    cursor.execute(query)
+                return cursor
+        except sqlite3.Error as e:
+            raise DatabaseError(f"Query execution failed: {e}")
+    
+    async def fetch_one(
+        self,
+        query: str,
+        params: Optional[Tuple[Any, ...]] = None
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Fetch a single row from query.
+        
+        Args:
+            query: SQL query string
+            params: Query parameters
+            
+        Returns:
+            Row as dictionary or None
+        """
+        with self.cursor() as cursor:
+            if params:
+                cursor.execute(query, params)
+            else:
+                cursor.execute(query)
+            row = cursor.fetchone()
+            return dict(row) if row else None
+    
+    async def fetch_all(
+        self,
+        query: str,
+        params: Optional[Tuple[Any, ...]] = None
+    ) -> List[Dict[str, Any]]:
+        """
+        Fetch all rows from query.
+        
+        Args:
+            query: SQL query string
+            params: Query parameters
+            
+        Returns:
+            List of rows as dictionaries
+        """
+        with self.cursor() as cursor:
+            if params:
+                cursor.execute(query, params)
+            else:
+                cursor.execute(query)
+            rows = cursor.fetchall()
+            return [dict(row) for row in rows]
+    
+    async def execute_many(
+        self,
+        query: str,
+        params_list: List[Tuple[Any, ...]]
+    ) -> None:
+        """
+        Execute query with multiple parameter sets.
+        
+        Args:
+            query: SQL query string
+            params_list: List of parameter tuples
+            
+        Raises:
+            DatabaseError: If query fails
+        """
+        try:
+            with self.cursor() as cursor:
+                cursor.executemany(query, params_list)
+        except sqlite3.Error as e:
+            raise DatabaseError(f"Bulk execution failed: {e}")
+    
+    def __enter__(self):
+        """Context manager entry."""
+        self.connect()
+        return self
+    
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Context manager exit."""
+        self.close()
+
+
+def get_database_connection(
+    db_path: Path,
+    timeout: int = 30
+) -> DatabaseConnection:
+    """
+    Get a database connection for a given path.
+    
+    Args:
+        db_path: Path to database file
+        timeout: Connection timeout in seconds
+        
+    Returns:
+        DatabaseConnection instance
+    """
+    return DatabaseConnection(db_path, timeout)
+
+
+def ensure_database(db_path: Path) -> Path:
+    """
+    Ensure database file and parent directory exist.
+    
+    Args:
+        db_path: Path to database file
+        
+    Returns:
+        Database path
+    """
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+    return db_path
+
+
+def vacuum_database(db_path: Path) -> None:
+    """
+    Vacuum database to optimize storage.
+    
+    Args:
+        db_path: Path to database file
+        
+    Raises:
+        DatabaseError: If vacuum fails
+    """
+    try:
+        with DatabaseConnection(db_path) as db:
+            db.execute("VACUUM")
+    except sqlite3.Error as e:
+        raise DatabaseError(f"Database vacuum failed: {e}")
+
+
+def get_table_info(db_path: Path, table_name: str) -> List[Dict[str, Any]]:
+    """
+    Get information about a table's columns.
+    
+    Args:
+        db_path: Path to database file
+        table_name: Name of table
+        
+    Returns:
+        List of column information dictionaries
+    """
+    with DatabaseConnection(db_path) as db:
+        return db.fetch_all(f"PRAGMA table_info({table_name})")
+
+
+def table_exists(db_path: Path, table_name: str) -> bool:
+    """
+    Check if a table exists in the database.
+    
+    Args:
+        db_path: Path to database file
+        table_name: Name of table
+        
+    Returns:
+        True if table exists
+    """
+    with DatabaseConnection(db_path) as db:
+        result = db.fetch_one(
+            "SELECT name FROM sqlite_master WHERE type='table' AND name=?",
+            (table_name,)
+        )
+        return result is not None
diff --git a/aitbc/decorators.py b/aitbc/decorators.py
new file mode 100644
index 00000000..71c880c9
--- /dev/null
+++ b/aitbc/decorators.py
@@ -0,0 +1,185 @@
+"""
+AITBC Common Decorators
+Reusable decorators for common patterns in AITBC applications
+"""
+
+import time
+import functools
+from typing import Callable, Type, Any
+from .exceptions import AITBCError
+
+
+def retry(
+    max_attempts: int = 3,
+    delay: float = 1.0,
+    backoff: float = 2.0,
+    exceptions: tuple[Type[Exception], ...] = (Exception,),
+    on_failure: Callable[[Exception], Any] = None
+):
+    """
+    Retry a function with exponential backoff.
+    
+    Args:
+        max_attempts: Maximum number of retry attempts
+        delay: Initial delay between retries in seconds
+        backoff: Multiplier for delay after each retry
+        exceptions: Tuple of exception types to catch
+        on_failure: Optional callback function called on final failure
+        
+    Returns:
+        Decorated function that retries on failure
+    """
+    def decorator(func: Callable) -> Callable:
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            last_exception = None
+            current_delay = delay
+            
+            for attempt in range(max_attempts):
+                try:
+                    return func(*args, **kwargs)
+                except exceptions as e:
+                    last_exception = e
+                    if attempt < max_attempts - 1:
+                        time.sleep(current_delay)
+                        current_delay *= backoff
+                    else:
+                        if on_failure:
+                            on_failure(e)
+                        raise
+            
+            raise last_exception if last_exception else AITBCError("Retry failed")
+        
+        return wrapper
+    return decorator
+
+
+def timing(func: Callable) -> Callable:
+    """
+    Decorator to measure and log function execution time.
+    
+    Args:
+        func: Function to time
+        
+    Returns:
+        Decorated function that prints execution time
+    """
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        start_time = time.time()
+        result = func(*args, **kwargs)
+        end_time = time.time()
+        execution_time = end_time - start_time
+        print(f"{func.__name__} executed in {execution_time:.4f} seconds")
+        return result
+    
+    return wrapper
+
+
+def cache_result(ttl: int = 300):
+    """
+    Simple in-memory cache decorator with TTL.
+    
+    Args:
+        ttl: Time to live for cached results in seconds
+        
+    Returns:
+        Decorated function with caching
+    """
+    cache = {}
+    
+    def decorator(func: Callable) -> Callable:
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            # Create cache key from function name and arguments
+            cache_key = (func.__name__, args, frozenset(kwargs.items()))
+            current_time = time.time()
+            
+            # Check if cached result exists and is not expired
+            if cache_key in cache:
+                result, timestamp = cache[cache_key]
+                if current_time - timestamp < ttl:
+                    return result
+            
+            # Call function and cache result
+            result = func(*args, **kwargs)
+            cache[cache_key] = (result, current_time)
+            return result
+        
+        return wrapper
+    return decorator
+
+
+def validate_args(*validators: Callable):
+    """
+    Decorator to validate function arguments.
+    
+    Args:
+        *validators: Validation functions that raise ValueError on invalid input
+        
+    Returns:
+        Decorated function with argument validation
+    """
+    def decorator(func: Callable) -> Callable:
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            for validator in validators:
+                validator(*args, **kwargs)
+            return func(*args, **kwargs)
+        
+        return wrapper
+    return decorator
+
+
+def handle_exceptions(
+    default_return: Any = None,
+    log_errors: bool = True,
+    raise_on: tuple[Type[Exception], ...] = ()
+):
+    """
+    Decorator to handle exceptions gracefully.
+    
+    Args:
+        default_return: Value to return on exception
+        log_errors: Whether to log errors
+        raise_on: Tuple of exception types to still raise
+        
+    Returns:
+        Decorated function with exception handling
+    """
+    def decorator(func: Callable) -> Callable:
+        @functools.wraps(func)
+        def wrapper(*args, **kwargs):
+            try:
+                return func(*args, **kwargs)
+            except raise_on as e:
+                raise
+            except Exception as e:
+                if log_errors:
+                    print(f"Error in {func.__name__}: {e}")
+                return default_return
+        
+        return wrapper
+    return decorator
+
+
+def async_timing(func: Callable) -> Callable:
+    """
+    Decorator to measure async function execution time.
+    
+    Args:
+        func: Async function to time
+        
+    Returns:
+        Decorated async function that prints execution time
+    """
+    @functools.wraps(func)
+    async def wrapper(*args, **kwargs):
+        start_time = time.time()
+        result = await func(*args, **kwargs)
+        end_time = time.time()
+        execution_time = end_time - start_time
+        print(f"{func.__name__} executed in {execution_time:.4f} seconds")
+        return result
+    
+    return wrapper
diff --git a/aitbc/monitoring.py b/aitbc/monitoring.py
new file mode 100644
index 00000000..cd4abab9
--- /dev/null
+++ b/aitbc/monitoring.py
@@ -0,0 +1,259 @@
+"""
+AITBC Monitoring and Metrics Utilities
+Monitoring and metrics collection for AITBC applications
+"""
+
+import time
+from typing import Dict, Any, Optional
+from collections import defaultdict
+from datetime import datetime, timedelta
+
+
+class MetricsCollector:
+    """
+    Simple in-memory metrics collector for AITBC applications.
+    Tracks counters, timers, and gauges.
+    """
+    
+    def __init__(self):
+        """Initialize metrics collector."""
+        self.counters: Dict[str, int] = defaultdict(int)
+        self.timers: Dict[str, list] = defaultdict(list)
+        self.gauges: Dict[str, float] = {}
+        self.timestamps: Dict[str, datetime] = {}
+    
+    def increment(self, metric: str, value: int = 1) -> None:
+        """
+        Increment a counter metric.
+        
+        Args:
+            metric: Metric name
+            value: Value to increment by
+        """
+        self.counters[metric] += value
+        self.timestamps[metric] = datetime.now()
+    
+    def decrement(self, metric: str, value: int = 1) -> None:
+        """
+        Decrement a counter metric.
+        
+        Args:
+            metric: Metric name
+            value: Value to decrement by
+        """
+        self.counters[metric] -= value
+        self.timestamps[metric] = datetime.now()
+    
+    def timing(self, metric: str, duration: float) -> None:
+        """
+        Record a timing metric.
+        
+        Args:
+            metric: Metric name
+            duration: Duration in seconds
+        """
+        self.timers[metric].append(duration)
+        self.timestamps[metric] = datetime.now()
+    
+    def set_gauge(self, metric: str, value: float) -> None:
+        """
+        Set a gauge metric.
+        
+        Args:
+            metric: Metric name
+            value: Gauge value
+        """
+        self.gauges[metric] = value
+        self.timestamps[metric] = datetime.now()
+    
+    def get_counter(self, metric: str) -> int:
+        """
+        Get counter value.
+        
+        Args:
+            metric: Metric name
+            
+        Returns:
+            Counter value
+        """
+        return self.counters.get(metric, 0)
+    
+    def get_timer_stats(self, metric: str) -> Dict[str, float]:
+        """
+        Get timer statistics for a metric.
+        
+        Args:
+            metric: Metric name
+            
+        Returns:
+            Dictionary with min, max, avg, count
+        """
+        timings = self.timers.get(metric, [])
+        if not timings:
+            return {"min": 0, "max": 0, "avg": 0, "count": 0}
+        
+        return {
+            "min": min(timings),
+            "max": max(timings),
+            "avg": sum(timings) / len(timings),
+            "count": len(timings)
+        }
+    
+    def get_gauge(self, metric: str) -> Optional[float]:
+        """
+        Get gauge value.
+        
+        Args:
+            metric: Metric name
+            
+        Returns:
+            Gauge value or None
+        """
+        return self.gauges.get(metric)
+    
+    def get_all_metrics(self) -> Dict[str, Any]:
+        """
+        Get all collected metrics.
+        
+        Returns:
+            Dictionary of all metrics
+        """
+        return {
+            "counters": dict(self.counters),
+            "timers": {k: self.get_timer_stats(k) for k in self.timers},
+            "gauges": dict(self.gauges),
+            "timestamps": {k: v.isoformat() for k, v in self.timestamps.items()}
+        }
+    
+    def reset_metric(self, metric: str) -> None:
+        """
+        Reset a specific metric.
+        
+        Args:
+            metric: Metric name
+        """
+        if metric in self.counters:
+            del self.counters[metric]
+        if metric in self.timers:
+            del self.timers[metric]
+        if metric in self.gauges:
+            del self.gauges[metric]
+        if metric in self.timestamps:
+            del self.timestamps[metric]
+    
+    def reset_all(self) -> None:
+        """Reset all metrics."""
+        self.counters.clear()
+        self.timers.clear()
+        self.gauges.clear()
+        self.timestamps.clear()
+
+
+class PerformanceTimer:
+    """
+    Context manager for timing operations.
+    """
+    
+    def __init__(self, collector: MetricsCollector, metric: str):
+        """
+        Initialize timer.
+        
+        Args:
+            collector: MetricsCollector instance
+            metric: Metric name
+        """
+        self.collector = collector
+        self.metric = metric
+        self.start_time = None
+    
+    def __enter__(self):
+        """Start timing."""
+        self.start_time = time.time()
+        return self
+    
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        """Stop timing and record metric."""
+        if self.start_time:
+            duration = time.time() - self.start_time
+            self.collector.timing(self.metric, duration)
+
+
+class HealthChecker:
+    """
+    Health check utilities for AITBC applications.
+    """
+    
+    def __init__(self):
+        """Initialize health checker."""
+        self.checks: Dict[str, Any] = {}
+        self.last_check: Optional[datetime] = None
+    
+    def add_check(self, name: str, check_func: callable) -> None:
+        """
+        Add a health check.
+        
+        Args:
+            name: Check name
+            check_func: Function that returns (status, message)
+        """
+        self.checks[name] = check_func
+    
+    def run_check(self, name: str) -> Dict[str, Any]:
+        """
+        Run a specific health check.
+        
+        Args:
+            name: Check name
+            
+        Returns:
+            Check result with status and message
+        """
+        if name not in self.checks:
+            return {"status": "unknown", "message": f"Check '{name}' not found"}
+        
+        try:
+            status, message = self.checks[name]()
+            return {"status": status, "message": message}
+        except Exception as e:
+            return {"status": "error", "message": str(e)}
+    
+    def run_all_checks(self) -> Dict[str, Any]:
+        """
+        Run all health checks.
+        
+        Returns:
+            Dictionary of all check results
+        """
+        self.last_check = datetime.now()
+        results = {}
+        
+        for name in self.checks:
+            results[name] = self.run_check(name)
+        
+        return {
+            "checks": results,
+            "overall_status": self._get_overall_status(results),
+            "timestamp": self.last_check.isoformat()
+        }
+    
+    def _get_overall_status(self, results: Dict[str, Any]) -> str:
+        """
+        Determine overall health status.
+        
+        Args:
+            results: Check results
+            
+        Returns:
+            Overall status (healthy, degraded, unhealthy)
+        """
+        if not results:
+            return "unknown"
+        
+        statuses = [r.get("status", "unknown") for r in results.values()]
+        
+        if all(s == "healthy" for s in statuses):
+            return "healthy"
+        elif any(s == "unhealthy" for s in statuses):
+            return "unhealthy"
+        else:
+            return "degraded"
diff --git a/aitbc/validation.py b/aitbc/validation.py
new file mode 100644
index 00000000..fde19f89
--- /dev/null
+++ b/aitbc/validation.py
@@ -0,0 +1,245 @@
+"""
+AITBC Validation Utilities
+Common validators for AITBC applications
+"""
+
+import re
+from typing import Any, Optional
+from .exceptions import ValidationError
+
+
+def validate_address(address: str) -> bool:
+    """
+    Validate an AITBC blockchain address.
+    
+    Args:
+        address: Address string to validate
+        
+    Returns:
+        True if address is valid format
+        
+    Raises:
+        ValidationError: If address format is invalid
+    """
+    if not address:
+        raise ValidationError("Address cannot be empty")
+    
+    # AITBC addresses typically start with 'ait' and are alphanumeric
+    pattern = r'^ait[a-z0-9]{40}$'
+    if not re.match(pattern, address):
+        raise ValidationError(f"Invalid address format: {address}")
+    
+    return True
+
+
+def validate_hash(hash_str: str) -> bool:
+    """
+    Validate a hash string (hex string of expected length).
+    
+    Args:
+        hash_str: Hash string to validate
+        
+    Returns:
+        True if hash is valid format
+        
+    Raises:
+        ValidationError: If hash format is invalid
+    """
+    if not hash_str:
+        raise ValidationError("Hash cannot be empty")
+    
+    # Hashes are typically 64-character hex strings
+    pattern = r'^[a-f0-9]{64}$'
+    if not re.match(pattern, hash_str):
+        raise ValidationError(f"Invalid hash format: {hash_str}")
+    
+    return True
+
+
+def validate_url(url: str) -> bool:
+    """
+    Validate a URL string.
+    
+    Args:
+        url: URL string to validate
+        
+    Returns:
+        True if URL is valid format
+        
+    Raises:
+        ValidationError: If URL format is invalid
+    """
+    if not url:
+        raise ValidationError("URL cannot be empty")
+    
+    pattern = r'^https?://[^\s/$.?#].[^\s]*$'
+    if not re.match(pattern, url):
+        raise ValidationError(f"Invalid URL format: {url}")
+    
+    return True
+
+
+def validate_port(port: int) -> bool:
+    """
+    Validate a port number.
+    
+    Args:
+        port: Port number to validate
+        
+    Returns:
+        True if port is valid
+        
+    Raises:
+        ValidationError: If port is invalid
+    """
+    if not isinstance(port, int):
+        raise ValidationError(f"Port must be an integer, got {type(port)}")
+    
+    if port < 1 or port > 65535:
+        raise ValidationError(f"Port must be between 1 and 65535, got {port}")
+    
+    return True
+
+
+def validate_email(email: str) -> bool:
+    """
+    Validate an email address.
+    
+    Args:
+        email: Email address to validate
+        
+    Returns:
+        True if email is valid format
+        
+    Raises:
+        ValidationError: If email format is invalid
+    """
+    if not email:
+        raise ValidationError("Email cannot be empty")
+    
+    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
+    if not re.match(pattern, email):
+        raise ValidationError(f"Invalid email format: {email}")
+    
+    return True
+
+
+def validate_non_empty(value: Any, field_name: str = "value") -> bool:
+    """
+    Validate that a value is not empty.
+    
+    Args:
+        value: Value to validate
+        field_name: Name of the field for error message
+        
+    Returns:
+        True if value is not empty
+        
+    Raises:
+        ValidationError: If value is empty
+    """
+    if value is None:
+        raise ValidationError(f"{field_name} cannot be None")
+    
+    if isinstance(value, str) and not value.strip():
+        raise ValidationError(f"{field_name} cannot be empty string")
+    
+    if isinstance(value, (list, dict)) and len(value) == 0:
+        raise ValidationError(f"{field_name} cannot be empty")
+    
+    return True
+
+
+def validate_positive_number(value: Any, field_name: str = "value") -> bool:
+    """
+    Validate that a value is a positive number.
+    
+    Args:
+        value: Value to validate
+        field_name: Name of the field for error message
+        
+    Returns:
+        True if value is positive
+        
+    Raises:
+        ValidationError: If value is not positive
+    """
+    if not isinstance(value, (int, float)):
+        raise ValidationError(f"{field_name} must be a number, got {type(value)}")
+    
+    if value <= 0:
+        raise ValidationError(f"{field_name} must be positive, got {value}")
+    
+    return True
+
+
+def validate_range(value: Any, min_val: float, max_val: float, field_name: str = "value") -> bool:
+    """
+    Validate that a value is within a specified range.
+    
+    Args:
+        value: Value to validate
+        min_val: Minimum allowed value
+        max_val: Maximum allowed value
+        field_name: Name of the field for error message
+        
+    Returns:
+        True if value is within range
+        
+    Raises:
+        ValidationError: If value is outside range
+    """
+    if not isinstance(value, (int, float)):
+        raise ValidationError(f"{field_name} must be a number, got {type(value)}")
+    
+    if value < min_val or value > max_val:
+        raise ValidationError(f"{field_name} must be between {min_val} and {max_val}, got {value}")
+    
+    return True
+
+
+def validate_chain_id(chain_id: str) -> bool:
+    """
+    Validate a chain ID.
+    
+    Args:
+        chain_id: Chain ID to validate
+        
+    Returns:
+        True if chain ID is valid
+        
+    Raises:
+        ValidationError: If chain ID is invalid
+    """
+    if not chain_id:
+        raise ValidationError("Chain ID cannot be empty")
+    
+    # Chain IDs are typically alphanumeric with hyphens
+    pattern = r'^[a-z0-9\-]+$'
+    if not re.match(pattern, chain_id):
+        raise ValidationError(f"Invalid chain ID format: {chain_id}")
+    
+    return True
+
+
+def validate_uuid(uuid_str: str) -> bool:
+    """
+    Validate a UUID string.
+    
+    Args:
+        uuid_str: UUID string to validate
+        
+    Returns:
+        True if UUID is valid format
+        
+    Raises:
+        ValidationError: If UUID format is invalid
+    """
+    if not uuid_str:
+        raise ValidationError("UUID cannot be empty")
+    
+    pattern = r'^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
+    if not re.match(pattern, uuid_str.lower()):
+        raise ValidationError(f"Invalid UUID format: {uuid_str}")
+    
+    return True
diff --git a/apps/blockchain-node/src/aitbc_chain/main.py b/apps/blockchain-node/src/aitbc_chain/main.py
index 00f341bf..9e99c64d 100755
--- a/apps/blockchain-node/src/aitbc_chain/main.py
+++ b/apps/blockchain-node/src/aitbc_chain/main.py
@@ -102,6 +102,7 @@ class BlockchainNode:
         
         async def process_txs():
             from .mempool import get_mempool
+            from .rpc.router import _normalize_transaction_data
             mempool = get_mempool()
             while True:
                 try:
@@ -110,6 +111,8 @@ class BlockchainNode:
                         import json
                         tx_data = json.loads(tx_data)
                     chain_id = tx_data.get("chain_id", settings.chain_id)
+                    # Normalize transaction data to ensure type field is preserved
+                    tx_data = _normalize_transaction_data(tx_data, chain_id)
                     mempool.add(tx_data, chain_id=chain_id)
                 except Exception as exc:
                     logger.error(f"Error processing transaction from gossip: {exc}")
diff --git a/apps/blockchain-node/src/aitbc_chain/rpc/router.py b/apps/blockchain-node/src/aitbc_chain/rpc/router.py
index d515b1b2..4262be77 100755
--- a/apps/blockchain-node/src/aitbc_chain/rpc/router.py
+++ b/apps/blockchain-node/src/aitbc_chain/rpc/router.py
@@ -308,7 +308,12 @@ async def submit_transaction(tx_data: TransactionRequest) -> Dict[str, Any]:
             "signature": tx_data.sig
         }
         
+        _logger.info(f"[ROUTER] Submitting transaction: type={tx_data.type}, normalized_type={tx_data_dict.get('type')}")
+        
         tx_data_dict = _normalize_transaction_data(tx_data_dict, chain_id)
+        
+        _logger.info(f"[ROUTER] After normalization: type={tx_data_dict.get('type')}, keys={list(tx_data_dict.keys())}")
+        
         _validate_transaction_admission(tx_data_dict, mempool)
 
         tx_hash = mempool.add(tx_data_dict, chain_id=chain_id)