Ink! Simple Vault (Deposit + Withdraw) - Ink Typing CST Test
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Ink! Simple Vault (Deposit + Withdraw) — Ink Code
A vault contract for storing native chain tokens with deposit/withdraw logic.
#[ink::contract]
mod vault {
#[ink(storage)]
pub struct Vault {}
impl Vault {
#[ink(constructor)]
pub fn new() -> Self { Self {} }
#[ink(message, payable)]
pub fn deposit(&mut self) {}
#[ink(message)]
pub fn withdraw(&mut self, amount: u128) {
self.env().transfer(self.env().caller(), amount).unwrap();
}
}
}Ink Language Guide
Ink! is a Rust-based eDSL (embedded domain-specific language) for writing smart contracts on the Substrate blockchain framework. It emphasizes safety, efficiency, and tight integration with Polkadot and Substrate ecosystems.
Primary Use Cases
- ▸High-security smart contracts
- ▸DeFi protocols on Substrate
- ▸NFT minting and marketplaces
- ▸On-chain governance modules
- ▸Wasm-based blockchain apps
Notable Features
- ▸Rust-based syntax
- ▸Compile-time type safety
- ▸Wasm target for Substrate
- ▸Macros for contract boilerplate
- ▸Support for storage, events, and messages
Origin & Creator
Ink! was created by Parity Technologies, the team behind Substrate and Polkadot, to provide a safe Rust-based smart contract language for WebAssembly chains. Initial development started around 2018.
Industrial Note
Ink! is primarily used in Substrate-based chains and Polkadot parachains, for high-assurance contracts in DeFi, on-chain governance, NFT minting, and other blockchain-native applications.