Arc, the new blockchain project associated with Circle, laid out a phased plan for post-quantum security ahead of its public launch. In its roadmap, the team said users will be able to opt into hybrid wallet signatures at mainnet, pairing conventional cryptography with quantum-resistant schemes instead of waiting for a chain-wide migration later.

That design choice matters because most large blockchains are still discussing how to handle a future in which powerful quantum computers could weaken today's signature systems. Arc framed its approach as a way to give new users a safer default path without forcing every wallet, contract, or developer tool to change at once.

According to the roadmap, later phases will extend those protections beyond user wallets to validator operations and other network infrastructure. CoinDesk reported the project plans to launch with these quantum-era features already in place, making Arc one of the clearest examples of a new chain trying to address the risk before it becomes an emergency retrofit.

The company was also careful not to oversell the rollout. Arc said broad ecosystem support will take time, and described the roadmap as a practical migration path rather than a complete day-one replacement for existing cryptographic standards. For builders, that is the interesting part: new chains can introduce hybrid security at launch far more easily than legacy networks coordinating upgrades across millions of existing addresses.