Introduction

ckSOL is a chain-key token on the Internet Computer that is backed 1:1 by SOL, the native token of the Solana blockchain.

Each ckSOL is backed by exactly 1 SOL held by the ckSOL minter canister. ckSOL can be converted to SOL at any time, and vice versa.

Deployment

ckSOL (Solana Mainnet)

ckDevnetSOL (Solana Devnet)

Architecture

graph TD
    subgraph IC["Internet Computer"]
        Minter["ckSOL Minter\n(this repo)"]
        Ledger["ckSOL Ledger"]
        RPC["SOL RPC Canister"]
        Minter --> Ledger
        Minter --> RPC
    end
    RPC -->|HTTPS outcalls| Providers["Solana JSON-RPC providers\n(Ankr, Helius, dRPC, ...)"]
    Providers --> Solana["Solana Blockchain"]

ckSOL Minter — The main canister in this repository. It manages the deposit and withdrawal lifecycle, holds custody of SOL via chain-key addresses, signs Solana transactions using threshold Schnorr over Ed25519, and interacts with the ckSOL ledger.

ckSOL Ledger — A standard ICRC-1/ICRC-2 ledger canister. It tracks ckSOL balances and processes mints and burns as instructed by the minter.

SOL RPC Canister — A shared infrastructure canister on the Internet Computer that relays Solana JSON-RPC calls to multiple providers via HTTPS outcalls and aggregates their responses. See the SOL RPC canister repository for details.

Where to next?

• Converting SOL to ckSOL and back? Start with How It Works, then the command line walkthrough.
• Reviewing the system? See the Design.
• Operating the canisters? See the Deployment guide and the Mainnet Proposals.
• Building from source? See Building and Testing.