12189 | Proposal to Upgrade Terra Classic v3.5.0

Source from:

• https://validator.info/terra-classic/governance/12189
• https://github.com/classic-terra/documents/blob/main/proposals/v12-proposal.md

Proposal to Upgrade Terra Classic Blockchain to Release v3.5.0

Release v3.5.0

A new release of the terrad client has been created on 25 Jul 2025 . The release notes for the new version can be viewed here:
https://github.com/classic-terra/core/releases/tag/v3.5.0

This release introduces a new on-chain module enables tax-exempt transactions based on address groupings called zones. Tax logic is now handled natively by the chain using zone-based rules set via governanceg. The technical release notes can be found at https://github.com/classic-terra/documents/blob/main/chain-updates/v3_5_0.md

Proposal

This proposal seeks validator and community approval to update the terrad client to v3.5.0 (upgrade name v12). The chain will be halted at 24660000 which will approximately be processed on Aug 15 2025 15h30PM UTC. The actual halt time is an early estimate, can vary and depends on the chain’s block speed until the specified height is reached. Upon passing of this proposal, an automatic chain halt will be scheduled at the specified height. The validators are going to be asked to install the new version of the terrad client after the chain halt occured.

Upgrade Instructions for Validators

As soon as the chain automatically halts at the designated upgrade block height follow the upgrade procedure. Please don’t execute these commands before the chain has halted:

$ git clone https://github.com/classic-terra/core core-v3.5.0
$ cd core-v3.5.0
$ git checkout v3.5.0
$ make build && make install 

In case you already have a local copy of the repository inside the local folder core:

$ cd core
$ git stash
$ git fetch --all
$ git fetch --tags
$ git checkout v3.5.0
$ make build && make install

Check the correct installation:

$ terrad version
v3.5.0

After that, restart the client with terrad start or your system service and wait for consensus. During that period, don’t restart the client if not otherwise asked to do so.

Infrastructure Providers

Infrastructure providers who run mantlemint accelerated LCDs are asked to build and install the updated mantlemint version from source after the upgrade block height is reached:

https://github.com/classic-terra/core/releases/tag/v3.5.0-rc.0

Testing and Rollback

An upgrade to v3.5.0 release candidate was conducted on rebel-2 testnet on … and the changes were tested extensively. If for some unforeseen (and unlikely) reason the new release will not be able to produce new blocks on mainnet then the upgrade name v12 can be applied to the previous release v3.4.0. In this case validators are going to be asked to roll back to a previous state and apply a patched v3.4.0 release.

Effects of Voting

• YES – you agree to schedule an upgrade to v3.5.0
• NO – you don’t agree to schedule an upgrade to v3.5.0
• ABSTAIN – you want the proposal to reach quorum and align with the majority vote
• VETO – you strongly disagree and want the prop to fail with a 33,33% veto threshold