PIP-40: Paloma Mainnet upgrade to Paloma v1.7.2 & Pigeon v1.6.0 for Arbitrum Support

PIP Name: PIP-40: Paloma Mainnet Upgrade to Paloma v1.7.2 and Pigeon v1.6.0

Status: Proposed

Author(s): @LARRY

Type: Software Upgrade


Created: 09/01/2023

Simple Summary

This is a software upgrade for Paloma to v1.7.2 and Pigeon to v1.6.0 tags after the completion of the public testnet deployment with upgraded binaries. This software upgrade adds support for the Arbitrum chain. This software upgrade is a breaking upgrade and delivers new support for valset power calculations after the upgrade to a new target chain. This deployment also adds additional support for MEV relay endpoints for validators.


The Paloma mainnet continues to achieve the goal of fast and reliable valiator node support for effective cross-chain communication and cross-chain relay functionality. The Arbitrum network is a leading L2 Network that support the Ethereum ecosystem. The Ar


  1. Deploy further support for validator sets during cross-chain deployment
  2. Migrate L2 cross-chain relay to the Arbitrum Ethereum Go client
  3. Update Optimism and other EVM L2s to leverage new GETH client with Arbitrum support.

Specification Overview

This action requires an upgrade of palomad to the latest tag v1.7.2 and an upgrade of pigeond to v1.6.0. All migrations are included and have been tested live for the past week on the Paloma public testnest paloma-testnest-15. Validators simply need to install the new binary and restart their nodes at chainhat.

Technical Specification

The latest releases of Paloma and Pigeon are available here and includes the change logs for each for review prior to deployment:

  1. Download and install the latest Paloma tag: Release v1.7.2 · palomachain/paloma · GitHub

  2. Download and install the latest Pigeon tag: Release v1.6.0 · palomachain/pigeon · GitHub

  3. An upgrade proposal that must be submitted by anyone running a node on the network. This proposal should have the correct block height.

  4. Please use the following spreadsheet to calculate the approximate Block Height. https://docs.google.com/spreadsheets/d/1bglxgcFFhPnOdNYVnBcDyZ_UVuIQqGbtIP8l291jRm0/edit#gid=0 5

  5. This upgrade proposal requires 10 GRAIN or 10000000ugrain for deposit for voting.

  6. IMPORTANT: The upgrade height is the block height where the chain halts and requires the upgrade. Allow at least one (1) day AFTER voting end time and upgrade-height for 2/3 of the network to have downloaded the new binary and prepped for the switch over to avoid/minimize downtime of the Paloma chain.

  7. The Target block height for chain halt for this proposal is tentatively 3965822 or approximately 09/4/2023 5:41 AM UTC

    VALIDATOR="$(palomad keys list --list-names | head -n1)"
    palomad tx gov submit-legacy-proposal software-upgrade v1.7.2 \
      --title "Upgrade to Paloma Release v1.7.2 and Pigeon v1.6.0" \
      --description "Upgrade Paloma and Pigeon with Arbitrum EVM L2 support!" \
      --deposit 10000000ugrain \
      --fees 500ugrain \
      --upgrade-height $UPGRADE_HEIGHT \
      --upgrade-info '{"binaries":{"linux/amd64":"https://github.com/palomachain/paloma/releases/download/v1.7.2/paloma_Linux_x86_64.tar.gz"}}' \
      --gas 400000 \
      --from=$VALIDATOR \
      --chain-id messenger \
      --no-validate \

    How to Vote on the Proposal

palomad tx gov vote 25 yes \
--chain-id messenger \
--from <Your Paloma Address> \
--fees 400ugrain \

How to check if 2/3 of the network are online after vote is complete

curl -s localhost:26657/consensus_state | jq -r ".result.round_state.height_vote_set[0].prevotes_bit_array"

—> needs to return ≥ ~0.67 for the chain to start up again

To see which validators are online with the new binary, use GitHub - blockpane/pvtop: top-like tui for watching validator pre-votes on Tendermint chains


Let’s get Paloma to the next ecosystem of EVM L2s, Arbitrum and let’s improve valet updates for new chain deployment.

About Paloma

Paloma Protocol is a Cosmos-SDK blockchain protocol custom-built for
omnichain communication that allows permissionless controls of any
contract on any chain. Built by Volume, Paloma delivers the world’s
first intelligently scheduled and automated smart contract transaction
execution for the Cosmos ecosystem. The protocol enables developers to
remotely control the transmission of value without the need to wrap,
bridge tokens, or trust validators with their digital assets. Led by
founding members of Sommelier, Paloma is building the primary

communication layer of Web3.

To learn more about Paloma, please visit https://palomachain.com

To follow the project on Github, please star the project GitHub - palomachain/paloma: The fast blockchain messenger protocol

To participate in the community, please join the Paloma Discord: Paloma