Heimdall v0.8.1 is a mandatory, consensus-affecting release that all node operators must apply before the scheduled hard forks.
This update introduces a "Fee Withdraw Validator Gate". After the activation height, only addresses that belong to current, active validators will be permitted to withdraw accumulated transaction fees (using MsgWithdrawFeeTx). This change enhances network security by restricting fee withdrawals to authorized validator addresses.
Important: As this is a consensus-breaking change, all validators must upgrade their nodes to this version before the activation block heights to avoid forking and remain in sync with the network.
Hard Fork Activation Schedule:
Amoy Testnet
Block: 35914000
Date: Approximately 2026-05-28 at 14:00 UTC
Mainnet
Block: 46361000
Date: Approximately 2026-06-02 at 14:00 UTC
## What's Changed * app, helper, x/topup: implement fee withdraw validator gate by @marcello33 in https://github.com/0xPolygon/heimdall-v2/pull/601 ## HF activation heights: - Mainnet: block `46361000`, at 2026-06-02 14:00 UTC - Amoy: block `35914000`, at 2026-05-28 14:00 UTC **Full Changelog**: https://github.com/0xPolygon/heimdall-v2/compare/v0.7.1...v0.8.1