Spawn

Spawn is the easiest way to build, maintain and scale a Cosmos SDK blockchain. Spawn solves all the key pain points engineers face when building new Cosmos-SDK networks.

• Tailor-fit: Pick and choose modules to create a network for your needs.
• Commonality: Use native Cosmos tools and standards you're already familiar with.
• Integrations: Github actions and end-to-end testing are configured right from the start.
• Iteration: Quickly test between your new chain and established networks like the local Cosmos-Hub devnet.

Documentation

https://rollchains.github.io/spawn/v0.50/

Installation

Prerequisite Setup

If you do not have go 1.22+, Docker, or git installed, follow the instructions below.

• MacOS, Windows, and Ubuntu Setup

Install Spawn

# Download the the Spawn repository
git clone https://github.com/rollchains/spawn.git --depth=1 --branch v0.50.10
cd spawn

# Install Spawn
make install

# Install Local-Interchain (testnet runner)
make get-localic

# Attempt to run a command
spawn help

# Potential workaround if spawn is immediately killed when attempting run "spawn help" on a m* macbook.
# This may happen because of an xcode16 update.
# To work around this as a temporary measure please change this line in the Make file.
LD_FLAGS = -X main.SpawnVersion=$(VERSION)
# to
LD_FLAGS = -X main.SpawnVersion=$(VERSION) -s -w


# If you get "command 'spawn' not found", add to path.
# Run the following in your terminal to test
# Then add to ~/.bashrc (linux / windows) or ~/.zshrc (mac)
echo 'export PATH=$PATH:$(go env GOPATH)/bin' >> ~/.bashrc
source ~/.bashrc

Spawn in Action

In this 4 minute demo we:

• Create a new chain, customizing the modules and genesis
• Create a new nameservice module
  • Add the new message structure for transactions and queries
  • Store the new data types
  • Add the application logic
  • Connect it to the command line
• Build and launch a chain locally
• Interact with the chain's nameservice logic, settings a name, and retrieving it

Follow Along with the nameservice demo in the docs | source

spawn-demo.mp4