diff --git a/opt/aitbc/apps/blockchain-node/src/aitbc_chain/config.py b/opt/aitbc/apps/blockchain-node/src/aitbc_chain/config.py
new file mode 100755
index 00000000..ace7e9bf
--- /dev/null
+++ b/opt/aitbc/apps/blockchain-node/src/aitbc_chain/config.py
@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Optional
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+from pydantic import BaseModel
+
+class ProposerConfig(BaseModel):
+    chain_id: str
+    proposer_id: str
+    interval_seconds: int
+    max_block_size_bytes: int
+    max_txs_per_block: int
+
+class ChainSettings(BaseSettings):
+    model_config = SettingsConfigDict(env_file="/opt/aitbc/.env", env_file_encoding="utf-8", case_sensitive=False, extra="ignore")
+
+    chain_id: str = ""
+    supported_chains: str = "ait-devnet" # Comma-separated list of supported chain IDs
+    db_path: Path = Path("/opt/aitbc/data/chain.db")
+
+    rpc_bind_host: str = "127.0.0.1"
+    rpc_bind_port: int = 8080
+
+    p2p_bind_host: str = "127.0.0.2"
+    p2p_bind_port: int = 7070
+
+    proposer_id: str = ""
+    proposer_key: Optional[str] = None
+
+    mint_per_unit: int = 0  # No new minting after genesis for production
+    coordinator_ratio: float = 0.05
+
+    block_time_seconds: int = 2
+
+    # Block production toggle (set false on followers)
+    enable_block_production: bool = True
+
+    # Block production limits
+    max_block_size_bytes: int = 1_000_000  # 1 MB
+    max_txs_per_block: int = 500
+    min_fee: int = 0  # Minimum fee to accept into mempool
+
+    # Mempool settings
+    mempool_backend: str = "database"  # "database" or "memory" (database recommended for persistence)
+    mempool_max_size: int = 10_000
+    mempool_eviction_interval: int = 60  # seconds
+
+    # Circuit breaker
+    circuit_breaker_threshold: int = 5  # failures before opening
+    circuit_breaker_timeout: int = 30  # seconds before half-open
+
+    # Sync settings
+    trusted_proposers: str = ""  # comma-separated list of trusted proposer IDs
+    max_reorg_depth: int = 10  # max blocks to reorg on conflict
+    sync_validate_signatures: bool = True  # validate proposer signatures on import
+
+    gossip_backend: str = "memory"
+    gossip_broadcast_url: Optional[str] = None
+
+    # Keystore for proposer private key (future block signing)
+    keystore_path: Path = Path("/opt/aitbc/data/keystore")
+    keystore_password_file: Path = Path("/opt/aitbc/data/keystore/.password")
+
+
+settings = ChainSettings()