Beam First Hardfork Announcement

Beam Privacy
Jul 16, 2019 · 2 min read
Beam Privacy Hard Fork Announcement — Mimblewimble
Beam Privacy Hard Fork Announcement — Mimblewimble

Beam will execute the first hard fork as previously announced in our Roadmap.

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This first network upgrade will occur at Block Height 321321, expected to be reached on August 15th, 2019.

Breaking changes

  • PoW algorithm from Beam Hash I to Beam Hash II. More details on Beam Hash II can be found here
  • SBBS PoW (automatically performed by newer wallets) will become mandatory
  • A minimum fee of ( 10 * Number of kernels + 10 * Number of outputs ) will be enforced by the nodes. The default fee value in the wallet will be changed to 100 Groth
  • Support for Relative Time Locks


Compatible releases of node, wallet, and miner will be versioned Clear Cathode 3.0.

The Node and the Desktop Wallet binaries will be released on July 17th, 2019 to allow everyone approximately 30 days to upgrade to the new version.

The Mobile Wallets for Android and iOS will be released a bit later.

All users will only need to upgrade their software to the latest version.

The binaries support the current blockchain, and will automatically switch to the new consensus mechanism when the target block height is reached. No user intervention will be required. Funds will not be affected.


After the Block Height 321321 is reached, wallets earlier than 3.0 will stop working. The users will need to upgrade the wallets to version 3.0.0 or later to access the funds.


Any feedback? Any question? Any concern or problem?

Contact Team Beam:

Come discover Beam and join our community!

Download Beam Android Wallet on Google Play

Download Beam iOS Wallet on App Store

Learn more about Beam on our website and blog


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