Bitaigen Research Smart contracts were not first introduced by Ethereum; the basic concept already existed in Bitcoin long before. By executing predefined code on the blockchain, they enable automated, trust‑less contract enforcement without any third party.
In this article we trace the true origins of smart contracts, uncover the evolution from early Bitcoin scripts to the Ethereum Virtual Machine (EVM), and explain how they work and what technical limits they face. By comparing the two ecosystems, readers can dispel common misconceptions and understand how contracts execute automatically on a blockchain. If you want to learn why smart contracts are not an exclusive invention of Ethereum, keep reading.
Were smart contracts first proposed on the Ethereum network?
Smart contracts were not first proposed on the Ethereum network. In fact, the prototype of a smart contract already appeared on Bitcoin’s blockchain. The Bitcoin network requires every miner to verify transaction signatures to prevent a sender from impersonating another’s assets. This verification is essentially a set of instructions that perform a hash calculation and return a Boolean result of 0 or 1.
In theory, this instruction set can be extended with branches, variables, and other logical operations to form a language resembling Script; the language itself bears similarities to early Forth. Although Bitcoin script lacks loops and recursion and therefore is not Turing‑complete, it can still be used to write simple contracts, such as a payment agreement with a rental period. By contrast, Ethereum provides a fully Turing‑complete virtual machine (the EVM), supporting far more complex business logic.
Within the Bitcoin architecture there are only three core elements: wallets, transactions, and blocks. A smart contract can be viewed as a special type of account—its unique identifier is the hash of the contract code. If the contract code (or even a comment) is altered in any way, the resulting hash changes, creating a brand‑new contract. Consequently, a contract on the chain is unique and immutable; the blockchain permanently records its state.
How do smart contracts work?
Basic principles of contract execution
- Agreement between parties – For example, A wishes to buy an apartment from B; the two agree on price, delivery date, and other terms.
- Deploy the contract – The agreed terms are encoded into a program and deployed to the blockchain, creating an immutable contract instance.
- Automatic execution – A sends the agreed amount of cryptocurrency to the contract. Once the payment is received, the contract automatically triggers the next steps, such as delivering a digital key to B or completing the asset transfer.
Three example outcomes
| Condition | Result |
|---|---|
| **All conditions satisfied** | A receives the digital key, B receives the payment, and the transaction is completed. |
| **A underpays or defaults** | The contract does not release the key to A; the payment remains locked in the contract, and the transaction is terminated. |
| **B fails to deliver the key on time** | The contract automatically refunds A’s payment, effecting a reversal. |
Definition: A smart contract is a piece of program code stored on a blockchain that only runs when predefined conditions are met. The execution process is transparent and publicly queryable, and the code cannot be arbitrarily altered during the contract’s lifespan.
The core advantages of smart contracts are:
- No third party required – The two counterparties transfer trust directly through code.
- Automation – Once conditions are met, the contract executes instantly without human intervention.
- Immutability – After deployment the code cannot be changed, protecting each party’s rights from arbitrary tampering.
- Traceability – Every execution record is permanently stored on the blockchain, facilitating audit and verification.
Overview of application scenarios
- Token issuance – Creating ERC‑20, ERC‑721 and other standard tokens on Ethereum.
- Decentralized finance (DeFi) – Implementing lending, liquidity provision, automated market making and other financial primitives.
- Supply‑chain tracking – Recording each step of a product’s movement to improve transparency.
- Copyright management – Using immutable contracts to log ownership and licensing of creative works.
In summary, smart contracts are not an invention exclusive to Ethereum; they represent a pivotal milestone in the evolution of blockchain technology. By executing predefined code on‑chain, they deliver a trustworthy, automated, and transparent mechanism for contract enforcement, providing a solid technical foundation for a wide range of decentralized applications.
Related Reading
- Smart Contracts Explained: Concepts, Features, Uses & Risks
- Stock Tokenization on Blockchain: Liquidity & Transparency
- Ethereum Merge: PoW to PoS Upgrade
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