Jam Testnet Launch event

Event · PageRank 0.0000

Overview

JAM (the Join-Accumulate Machine) is the proposed successor architecture to Polkadot's Relay Chain, reframing the network as a distributed computer running services across many cores. The first public JAM testnet — the initial shared environment for testing independent JAM client implementations — launched in January 2026. Dozens of teams are building JAM clients in a range of programming languages under the Web3 Foundation's JAM Prize, with formal mainnet upgrade proposals expected later in 2026.

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Frequently asked questions

When did the JAM testnet launch?

January 2026, as the first public testing environment for JAM client implementations.

What is JAM?

The Join-Accumulate Machine, a redesign intended to replace Polkadot's Relay Chain with a distributed-computer architecture that runs services across many cores.

Is JAM live on Polkadot mainnet?

Not as of the testnet launch. Formal mainnet upgrade proposals were anticipated in the second half of 2026.