Ink! Timelock Contract - Ink Typing CST Test
Loading…
Ink! Timelock Contract — Ink Code
Funds can be withdrawn only after a specific block timestamp.
#[ink::contract]
mod timelock {
#[ink(storage)]
pub struct Timelock {
unlock: u64,
}
impl Timelock {
#[ink(constructor)]
pub fn new(unlock: u64) -> Self { Self { unlock } }
#[ink(message)]
pub fn withdraw(&mut self) {
assert!(self.env().block_timestamp() >= self.unlock);
self.env().transfer(self.env().caller(), self.env().balance()).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.