Details
Last Revised: June 18, 2026
As validation continues ahead of Mina’s Mainnet Mesa Upgrade, the Trailblazers Program will run an additional hard fork this weekend (Friday 19th to Sunday 21st of June) to finalize outstanding fixes and validate Automode functionality.
Following the stop-slot-release on Friday, the hard fork will take place on Saturday with all Block Producers using Automode.
Archive Node and SNARK Worker Ops will upgrade to the stop-slot-release. They will then upgrade manually post-hardfork before 10:00 AM UTC on Monday, 22 June. There is no rush for Archive Node and SNARK Worker Ops to upgrade, as the testing focus is on Automode. However, upgrading quickly after the Mesa package is published would be appreciated.
Additional Notes:
Block Producers:
- All Block Producer nodes must upgrade to the stop-slot-release on Friday.
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- NOTE: All Block Producer nodes running on Mesa Trail must upgrade to the stop-slot-release.
- All Block Producer nodes must upgrade using Automode.
SNARK Worker Ops:
- Upgrade to the stop-slot-release on Friday.
- Upgrade manually to the Mesa release package before 10AM UTC on Monday, 22 June.
- NOTE: o1Labs will be running SNARK Workers post-hardfork to support the network.
Archive Node Ops:
- Upgrade to the stop-slot-release on Friday.
- Upgrade manually to the Mesa release package before 10AM UTC on Monday, 22 June.
- Perform the following post-upgrade checks:
- Ensure the daemon is synced and healthy on the new network.
- Confirm the archive node is adding blocks.
- Confirm there are no missing blocks.
- Rosetta: for an account you know the expected balance for, check the balance is unchanged pre- and post-hardfork.
This section outlines the timeline and steps for node operators to follow.
Additional HF Schedule
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State Finalization Period Trailblazers upgrade their nodes at their assigned times |
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19 June |
zkApps Developers submit reports |
zkApps Developers |
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19 June |
10:00 AM UTC |
Mesa Trail Soft Fork release with Stop Slots published |
Milestone |
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19 June |
All Node Ops upgrade their nodes to the stop-slot-release |
All Node Ops |
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20 June |
10:00 AM UTC |
stop-transactions-slot |
Milestone |
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20 June |
Block Producers and SNARK Worker Ops keep nodes running until after the stop-network-slot |
BPs, SWs |
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20 June |
Monitor Network stops accepting transactions |
o1Labs |
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20 June |
12:00 PM UTC |
stop-network-slot |
Milestone |
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20 June |
Archive Node Ops upgrade schema, test and monitor their nodes and APIs |
Archive Node Ops |
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Post-Upgrade Network Preparation |
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20 June |
AutoStart of Post-Upgrade Mesa Trail Infrastructure |
Automode Node Ops, o1labs |
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20 June |
o1Labs prepares and builds the Mesa packages |
o1Labs |
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Post-Upgrade Network Launch |
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20 June |
Transaction Generator with Mesa Txns |
o1Labs |
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20 June |
14:00 PM UTC |
Mesa Trail 1st Slot |
Milestone |
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20 June |
Before 15:30 PM UTC |
Mesa Package Published |
Milestone |
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20 June |
SNARK Workers Ops upgrade manually to Post-Upgrade build before 10:00 AM UTC Monday, 22 June |
SNARK Worker Ops |
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20 June |
All Archive Nodes Op upgrades nodes and migrate to Post-Upgrade builds before 10:00 AM UTC Monday, 22 June |
All Archive Node Ops |
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20 June |
Mesa Trail 290th Block |
Milestone |
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Post-Upgrade Network Monitoring and Testing |
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20~ June |
Monitor Post-Upgrade Mesa Trail Network |
o1Labs |
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20 June |
Archive Node Ops test upgraded Archive Node and monitor |
Archive Node Ops |
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20 June |
zkApp Test Suite run |
o1Labs |
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21 June |
Morning UTC |
zkApp Developers and o1Labs test zkApps |
zkApp Developers, o1labs |
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21 June |
Check min-window density after 2.25 days of grace period |
o1Labs |
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22 June |
Archive Node Ops provide a complete PostgreSQL dump |
Archive Node Ops |
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About Mina Protocol
Mina is the world’s lightest blockchain, powered by participants. Rather than apply brute computing force, Mina uses advanced cryptography and recursive zk-SNARKs to design an entire blockchain that is about 22kb, the size of a couple of tweets. It is the first layer-1 to enable efficient implementation and easy programmability of zero knowledge smart contracts (zkApps). With its unique privacy features and ability to connect to any website, Mina is building a private gateway between the real world and crypto—and the secure, democratic future we all deserve.
