Chain Replicator

Overview

This script is designed to manipulate a Cosmos-SDK genesis export file, specifically modifying validator information and other parameters to facilitate the initialization of a local testnet based on mainnet state. The script makes the following modifications:

1. Removes smart contract codes, contracts, and sequences.
2. Sets all validators to jailed, so you can run the chain with 1 validator only
3. Replaces the mainnet public key of the a desired validator with a new local public key.
4. Updates the genesis file with the necessary changes to enable the validator and shorten the governance parameters to make testing of upgrades easier.

Usage

Configuration

Modify the folling variables in the create_genesis.py script to suit your needs:

    kintsugi_addr = "junovaloper1juczud9nep06t0khghvm643hf9usw45r23gsmr"
    kintsugi_byte_addr = "31E927F677282369B7E57D39FF9C47E3845BFDEA"
    kintsugi_conskey = "junovalcons1x85j0anh9q3kndl905ull8z8uwz9hl02y0n499"

    replace_pubkey = "fscxRe/wWtcPp07H4WfiH89kQYEYBYTjRJi2TbhX+Lk="
    replace_byte_addr = "0FAF0893503B86A775C12F434BBC17EAD232C03F"
    replace_conskey = "junovalcons1p7hs3y6s8wr2wawp9ap5h0qhatfr9spl8qyt2s"

You can create replacement keys by looking inside "priv_validator_key.json" file of a newly initialized local node and using the command junod tendermint show-address

Create new gensis

Export state from mainnet, and generate a new gensis file

# from the chain you want to replicate, export the state to a json file
junod export --for-zero-height --output-document genesis_export.json

# manipulate the export file to create a brand new genesis that can be used to start a new chain based on mainnet state
python3 create_genesis.py

Now you can copy paste gensis_new.json to your local node ~/.juno/config/genesis.json. If needed run junod comet unsafe-reset-all to reset the chain before starting it.