How Does Ethereum Differ from Bitcoin?
Ethereum, launched in 2015 as an evolution of Bitcoin's innovations, introduces several fundamental differences:
Macro-Level Contrasts:
- Purpose: Bitcoin functions primarily as a decentralized payment network, while Ethereum operates as a programmable platform supporting smart contracts, decentralized applications (dApps), and decentralized finance (DeFi).
- Native Assets: Bitcoin’s sole asset is BTC, whereas Ethereum’s ecosystem includes Ether (ETH), its native currency, and tokenized assets via ERC-20/ERC-721 standards.
- Flexibility: Bitcoin processes basic transactions, while Ethereum enables arbitrary code execution via its Ethereum Virtual Machine (EVM), allowing limitless contract types.
Technical Distinctions:
- Account Model: Ethereum uses an account-based system (with balances and storage), contrasting Bitcoin’s UTXO (Unspent Transaction Output) model.
- Tokenomics: ETH has no fixed supply cap, but its issuance is counterbalanced by EIP-1559 fee burns, which destroy a portion of transaction fees (Base Gas Fee), potentially making ETH deflationary during high demand.
Ethereum Accounts
An Ethereum account is an entity with an ETH balance capable of sending transactions. Accounts come in two types:
1. Externally Owned Accounts (EOAs)
- Controlled by private keys.
- Can initiate transactions (e.g., sending ETH).
- Creation is free.
2. Contract Accounts
- Governed by smart contract code.
- Deployed to the network (costs ETH for storage).
- Execute transactions only when triggered by an EOA.
Account Fields:
- Nonce: Tracks transaction count (prevents replay attacks).
- Balance: ETH holdings in Wei (1 ETH = 1e18 Wei).
- CodeHash: Hash of EVM code (empty for EOAs).
- StorageRoot: Hash of account storage (Merkle Patricia Trie).
Ethereum Virtual Machine (EVM)
The EVM is a decentralized runtime environment executing smart contracts across Ethereum nodes. Key concepts:
State Machine Model
Ethereum transitions from a distributed ledger (Bitcoin) to a distributed state machine:
- State (S): Global data structure (accounts, balances, contracts).
State Transition Function (Y): Processes transactions (T) to derive new state (S’):
Y(S, T) = S’
Gas Mechanism
Gas measures computational work for operations:
- Purpose: Prevents spam and infinite loops; fees paid in ETH.
Calculation:
Total Fee = Gas Units × (Base Fee + Priority Fee)- Base Fee: Burned dynamically (adjusts with network congestion).
- Priority Fee: Tip to validators for faster inclusion.
Example: Sending ETH consumes 21,000 gas. If Base Fee = 10 gwei and Priority Fee = 2 gwei:
21,000 × (10 + 2) = 252,000 gwei (0.000252 ETH) Nodes and Clients
Ethereum nodes combine two software components:
- Execution Client: Handles transactions, EVM execution, and state updates.
- Consensus Client: Manages PoS validation and block finalization.
Node Types
- Full Node: Stores entire blockchain; validates transactions independently.
- Archive Node: Retains all historical states (required for analytics).
- Light Node: Downloads headers only; relies on full nodes for data.
Consensus: Proof-of-Stake (PoS)
Post-Merge (2022), Ethereum replaced PoW with PoS:
- Validators: Stake 32 ETH to propose/validate blocks.
- Block Time: Fixed 12-second slots (vs. Bitcoin’s variable 10-minute blocks).
- Finality: Blocks achieve finality after two epochs (~12 minutes).
Ethereum’s Roadmap: ETH2 Upgrades
- The Merge: Combined PoW execution layer with PoS consensus layer (Beacon Chain).
- Sharding: Future upgrade to split the network into 64 chains for scalability.
👉 Discover how ETH2 enhances scalability
FAQ
Q: Can I unstake my ETH after the Merge?
A: Yes, but withdrawals are enabled via Shanghai upgrade (post-Merge).
Q: What’s the minimum ETH needed to stake?
A: 32 ETH per validator.
Q: How does EIP-1559 affect ETH supply?
A: Burns base fees, potentially making ETH deflationary during high usage.
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