Circle launched the Arc mainnet on September 16, 2026. The network utilizes the Malachite consensus engine, which provides sub-second transaction finality. According to Chief Product and Technology Officer Nikhil Chandhok, the blockchain is designed to be immutable, meaning stolen funds cannot be recovered through transaction rollbacks.
The network distributes consensus responsibilities among more than 20 validators. This structure prevents any single entity, including Circle, from altering the chain's history. While Arc does not support rollbacks, Circle retains the ability to freeze specific USDC addresses at the token layer upon law enforcement requests.
Arc is positioned as an economic operating system for financial applications and AI-driven activity. The platform uses trusted execution environments to ensure transaction data remains confidential, preventing validators or Circle from accessing private transaction contents.
The initial validator set operates under a Proof-of-Authority model and includes institutional participants such as BlackRock, Visa, and Mastercard. At launch, the network introduced the ARC token with a total supply of 10 billion, intended for future Proof-of-Stake governance, though these features are not yet active.
