Rootstock Releases Reed 8.1.0 with Parallel Execution on Testnet
Rootstock announced the RSKj Reed 8.1.0 release, a Testnet-only upgrade introducing Parallel Transaction Execution for scalability and laying the groundwork for the upcoming Union Bridge built on BitVMX technology
rootstock.io/blog
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Reed 8.1.0: RSKj Client Release and Testnet-only Network Upgrade

A Testnet network upgrade is a set of changes to the protocol consensus rules, which are activated at a defined block number only on Rootstock Testnet. Testnet upgrades allow the Rootstock community to validate new protocol features under real-world conditions before Mainnet activation, providing an essential testing ground for scalability improvements, new functionalities, and any other type of sensible protocol changes.