Mining and Staking

Mining and Staking

Blockchain networks need a way to add new transactions and secure the ledger. Mining (Proof of Work) and Staking (Proof of Stake) are the two dominant methods for achieving this.

Proof of Work — Mining

  Mining Process:
  ┌──────────────────────────────────────────────┐
  │  1. Collect pending transactions from pool   │
  │  2. Build candidate block                    │
  │  3. Set nonce = 0                            │
  │  4. Compute SHA-256(block header)            │
  │  5. Hash > target? ──No──► Nonce++ → Step 4  │
  │       │                                      │
  │      Yes                                     │
  │       │                                      │
  │  6. Broadcast valid block to network         │
  │  7. Other nodes verify and accept            │
  │  8. Receive block reward + transaction fees  │
  └──────────────────────────────────────────────┘

  Hardware needed: ASICs (Application-Specific ICs)
  Energy cost: Enormous — more than some countries

Proof of Stake — Staking

  Staking Process:
  ┌──────────────────────────────────────────────┐
  │  1. Lock up 32 ETH as collateral            │
  │  2. Enter the validator activation queue     │
  │  3. Once activated, participate in consensus│
  │  4. Randomly selected to propose blocks     │
  │  5. Attest to blocks proposed by others     │
  │  6. Earn rewards from transaction fees      │
  │  7. Misbehavior → Slashing (lose ETH)       │
  └──────────────────────────────────────────────┘

  Slashing conditions:
  - Proposing two different blocks at same height
  - Attesting to contradictory blocks

Mining vs Staking Comparison

  ┌────────────────────┬──────────────┬──────────────┐
  │  Criteria          │  PoW Mining  │  PoS Staking │
  ├────────────────────┼──────────────┼──────────────┤
  │  Hardware          │  ASICs/GPUs  │  Standard PC │
  │  Energy Usage      │  Very High   │  Very Low    │
  │  Initial Cost      │  $1000+ HW   │  32 ETH      │
  │  Ongoing Cost      │  Electricity │  Negligible  │
  │  Security Model    │  51% compute │  51% stake   │
  │  Barrier to Entry  │  Hardware    │  Capital     │
  │  Decentralization  │  Mining pools│  Stake pools │
  └────────────────────┴──────────────┴──────────────┘

The Ethereum Merge

In September 2022, Ethereum completed its transition from PoW to PoS — "The Merge." This was one of the largest live upgrades in software history, reducing Ethereum's energy consumption by approximately 99.95% while maintaining the same security guarantees.