Cardano Tests Blockchain Updates on Practice Network Before Going Live

Before making any changes to its live network, Cardano tests them on the Cardano Testnet, a practice network that uses test coins.

The testnet is a safe place for developers and other stakeholders to try out new software without affecting real users or their money.

The process involves moving changes from preview to preprod to mainnet, with each step providing feedback on how the upgrade will perform in real-world conditions.

For example, the Van Rossem hard fork was tested on the Cardano Testnet before being implemented on the live network, and it took effect on July 18, 2026.