FRANKLIN Rollup: sidechain governed by SNARKs

Spec: https://hackmd.io/cY-VP7SDTUGgPOzDiEU3TQ

Basics

Setup local dev environment

Prepare dev environment prerequisites: see docs/setup-dev.md

(Re)deploy db and contraсts:

franklin redeploy

Environment configurations

Env config files are held in etc/env/

List configurations:

franklin env

Switch between configurations:

franklin env <ENV_NAME>

Monitoring & management:

Seed for Metamask: fine music test violin matrix prize squirrel panther purchase material script deal Geth: geth attach http://localhost:8545

NOTE: if you are resetting geth, each Metamask account must be manually reset via Settings > Advanced > Reset account.

Blockscout (local blockchain explorer)

It generates quite some CPU load, but might be useful to visualize blockchain activity. Use with caution.

• Migrate blockscout (do this once to setup database): make blockscout-migrate
• Start: make blockscout-up
• Stop: make blockscout-down

Blockscout will be available at http://localhost:4000/txs

Build and run server + prover locally:

franklin server
franklin prover
franklin client

Client UI will be available at http://localhost:8080

Start server and prover as local docker containers:

• Start: make start
• Watch logs: make logs
• Stop: make stop

Build and push images to dockerhub:

make push

Development

Database migrations

cd src/storage
diesel database setup

This will create database 'plasma' (db url is set in [server/.env] file) with our schema.

• Rename server/storage/schema.rs.generated to schema.rs

• To reset migrations (will reset the db), run:

diesel migration reset

• Run tests:

db-tests

Generating keys

To generate a proving key, from server dir run:

cargo run --release --bin read_write_keys

It will generate a *VerificationKey.sol and *_pk.key files for 'deposit', 'exit' and 'transfer' circuits in the root folder.

Move files to proper locations:

mv -f n*VerificationKey.sol ./contracts/contracts/
mv -f *_pk.key ./prover/keys/

If the pregenerated leaf format changes, replace the EMPTY_TREE_ROOT constant in contracts/contracts/PlasmaStorage.sol.

Contratcs

Re-build contracts:

yarn build

IMPORTANT! Generated .abi and .bin files are fed to cargo to build module plasma::eth.

So you need to rebuild the code on every change (to be automated soon).

Deploy contracts

After the keys have been generated and copied to contracts:

• run redeploy

Update addresses (make sure to exclude 0x !):

• copy contracts address of PlasmaContract to CONTRACT_ADDR in /env

Publish source

yarn flatten

NOTE: Python >= 3.5 and pip is required for solidity flattener. You might want to run brew upgrade python