Polkadot Smart Chain (PSC)

February 13, 2023 · View on GitHub

PSC is an acronym for polkadot smart contract platform. It is an EVM smart contract parachain with DOT as the native Gas fee.

Polkadot's Parachain

PSC is a Polkadot parachain which uses directly DOT as transaction fees and jointly developed by the ChainX team and OmniBTC team. The ChainX team will build PSC into a cross-chain interoperability hub among the Bitcoin network, Polkadot ecology, EVM ecology, MoveVM ecology, and Cosmos ecology based on technologies such as Zkrollup, XCMP, ibc, and Lightning Network.

Part of OmniBTC liquidity aggregation

DolaProtocol is a chain-wide liquidity aggregation and settlement system with the single coin pool of each public chain as the core, Wormhole, Layerzero and other cross-chain messaging protocols as the bridge, and Sui public chain as the settlement center.

There are DOT and assets of each parachain on the Polkadot platform. We will deploy a single currency pool on the Polkadot Smart Chain to become OmniBTC’s liquidity pool site on the Polkadot platform, which is connected to other Polkadot parachains through the XCMP protocol. Committed to allowing the original assets on Polkadot to circulate with mainstream native assets such as BTC/ETH.

Build, test and launch local testnet

build and test

git clone https://github.com/OmniBTC/PSC.git

cd PSC

cargo test --release

cargo build --release

launch local testnet

Use zombienet launch a local testnet.

For provider=native(linux/macos, binaries), require build psc and our modified polakdot

Run: zombienet-linux-x64 spawn --provider native ./psc-small-network.toml

For provider=podman(linux, dockers), require install podman

Run: zombienet-linux-x64 spawn --provider podman ./psc-small-network.toml

Transfer DOT from Polkadot to PSC by DMP

dmp

Transfer DOT from PSC to Polkadot by UMP

ump

Evm support

Metamask (for account)

Network name: Polkadot Smart Chain
RPC URL: https://psc-parachain.coming.chat/rpc
Chain ID: 1508
Currency symbol: DOT

For local zombienet, use RPC URL: http://127.0.0.1:8546

Refer Connect MetaMask to Moonbeam

Remix (for contract)

Refer Interacting with Moonbeam Using Remix

Ethereum apis

Substrate Account & EVM address

This article introduce how the Ethereum address and Substrste account are associated

On PSC, pallet-assets-bridge bind EVM address and Substrate account, bind WASM assets and Erc20 tokens, deposit and withdraw fungible assets between WASM and EVM.

This tool can convert EVM address to Substrate(Polkadot) account.

As we all know, DOT decimals=10, Metamask supports evm chain with decimals=18 by default.

In order to be compatible with Metamask, chainx-frontier has done the following for Native Currency Balance

  • (1) wasm -> evm (get_Balance): expand 10810^{8}
  • (2) evm -> wasm (calc gas fee): shrink 10810^{8}

It is safe and acceptable.

Deploy contracts

Follow this test guide, learn how to deploy evm contracts.

Basic data

EXISTENTIAL_DEPOSIT = 0.01 DOT
wasm transfer:  0.0047732 DOT
evm transfer:  0.0046515 DOT
evm-address mapping reseve: 0.1 DOT