> ## Documentation Index
> Fetch the complete documentation index at: https://docs.train.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Security

> Key security details of the TRAIN protocol

* **Homogeneous Security**: The protocol establishes consistent cryptographic security for all permissionless participants. Security attributes remain unchanged when adding new networks or Solvers.

* **Battle-Tested**: The core technology of Atomic Swaps (HTLC) has been successfully used in production for the Lightning Network.

* **No Pools**: No single contract holds large amounts of funds. This design choice significantly reduces the risk of being targeted by attackers.

* **Immutability**: The contracts are immutable. This eliminates the risks associated with upgrades.

* **Simplicity**: HTLC contracts are straightforward locking mechanisms. Each contract typically consists of about [300 lines of code](https://github.com/TrainProtocol/contracts/blob/main/chains/evm/solidity/contracts/Train.sol) in any smart contract language.