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Video Tutorial

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The Contract

pragma language_version >= 0.23;

import CompactStandardLibrary;

// Public state visible on the blockchain
export ledger round: Counter;

// Circuit that increments the counter by 1
export circuit increment(): [] {
  round.increment(1);
}

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How It Works

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Public Ledger State

export ledger round: Counter;
Counter is a built-in type for counting operations. The value is publicly visible on the blockchain.

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The Increment Circuit

export circuit increment(): [] {
  round.increment(1);
}
Counter stores a non-negative integer and exposes .increment(n), .decrement(n), .read(), and comparison helpers like .lessThan(n). This example only uses .increment(1).

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What’s Next

Primitive Types

Explore all Compact data types

Hello World

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