Learn SIMPLICITY with Real Code Examples

Updated Nov 25, 2025

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Code Sample Descriptions

Simplicity Minimal Contract Example

// Define a contract that locks funds until a condition is met
contract lockFunds {
    input: signature sig, condition cond
    output: funds released if cond(sig) == true
}

A minimal example illustrating a composable financial contract in Simplicity.

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Simplicity Basic Escrow

contract escrow {
    input: sig senderSig, sig recipientSig
    output: funds released if verify(senderSig) && verify(recipientSig)
}

Funds are released to a recipient only if both parties sign.

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Simplicity Time-Lock Contract

contract timelock {
    input: currentBlockTime
    output: funds released if currentBlockTime >= lockTime
}

Funds are locked until a specific block time is reached.

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Simplicity Multi-Signature Wallet

contract multisig {
    input: sigs[3]
    output: funds released if count_valid(sigs) >= 2
}

Releases funds only if multiple signatures approve.

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Simplicity Conditional Payment

contract conditionalPay {
    input: sig payerSig, data d
    output: funds released if validate(d) && verify(payerSig)
}

Transfers funds only if a condition on input data is satisfied.

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Simplicity Atomic Swap

contract atomicSwap {
    input: hash preimage, sig senderSig, sig receiverSig
    output: funds released if hash(preimage) == knownHash && verify(senderSig) && verify(receiverSig)
}

Enables atomic swap between two parties using hash preimage.

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Simplicity Escrow with Timeout

contract escrowTimeout {
    input: sig senderSig, sig recipientSig, currentBlockTime
    output: funds released to recipient if verify(recipientSig) || refunded to sender if currentBlockTime >= timeout
}

Funds can be claimed by recipient or refunded after timeout.

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Simplicity Crowdfunding Contract

contract crowdfunding {
    input: sig contributorSig, amount, totalRaised
    output: release to owner if totalRaised >= goal else refundable to contributors
}

Funds are released to project owner only if funding goal is reached.

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Simplicity Token Vesting

contract vesting {
    input: currentBlockTime
    output: release vestedAmount(currentBlockTime) to recipient
}

Vests tokens over time to a recipient.

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Simplicity Payment Channel

contract paymentChannel {
    input: sig senderSig, sig receiverSig, balanceUpdate
    output: settle funds according to signed balanceUpdate
}

Enables off-chain microtransactions with on-chain settlement.

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Code Sample Descriptions

Simplicity Minimal Contract Example

// Define a contract that locks funds until a condition is met
contract lockFunds {
    input: signature sig, condition cond
    output: funds released if cond(sig) == true
}

A minimal example illustrating a composable financial contract in Simplicity.

Let’s Try →

Simplicity Basic Escrow

contract escrow {
    input: sig senderSig, sig recipientSig
    output: funds released if verify(senderSig) && verify(recipientSig)
}

Funds are released to a recipient only if both parties sign.

Let’s Try →

Simplicity Time-Lock Contract

contract timelock {
    input: currentBlockTime
    output: funds released if currentBlockTime >= lockTime
}

Funds are locked until a specific block time is reached.

Let’s Try →

Simplicity Multi-Signature Wallet

contract multisig {
    input: sigs[3]
    output: funds released if count_valid(sigs) >= 2
}

Releases funds only if multiple signatures approve.

Let’s Try →

Simplicity Conditional Payment

contract conditionalPay {
    input: sig payerSig, data d
    output: funds released if validate(d) && verify(payerSig)
}

Transfers funds only if a condition on input data is satisfied.

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Simplicity Atomic Swap

contract atomicSwap {
    input: hash preimage, sig senderSig, sig receiverSig
    output: funds released if hash(preimage) == knownHash && verify(senderSig) && verify(receiverSig)
}

Enables atomic swap between two parties using hash preimage.

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Simplicity Escrow with Timeout

contract escrowTimeout {
    input: sig senderSig, sig recipientSig, currentBlockTime
    output: funds released to recipient if verify(recipientSig) || refunded to sender if currentBlockTime >= timeout
}

Funds can be claimed by recipient or refunded after timeout.

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Simplicity Crowdfunding Contract

contract crowdfunding {
    input: sig contributorSig, amount, totalRaised
    output: release to owner if totalRaised >= goal else refundable to contributors
}

Funds are released to project owner only if funding goal is reached.

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Simplicity Token Vesting

contract vesting {
    input: currentBlockTime
    output: release vestedAmount(currentBlockTime) to recipient
}

Vests tokens over time to a recipient.

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Simplicity Payment Channel

contract paymentChannel {
    input: sig senderSig, sig receiverSig, balanceUpdate
    output: settle funds according to signed balanceUpdate
}

Enables off-chain microtransactions with on-chain settlement.

Let’s Try →