Proof of Work (PoW)
Quick Answer
Proof of Work is a consensus mechanism where miners solve computational puzzles to validate transactions. Used by Bitcoin, it is secure but slow (10-minute blocks).
Full Definition
Proof of Work is a consensus mechanism where miners compete to solve computationally intensive puzzles to validate transactions and produce new blocks. The first miner to solve the puzzle earns the block reward and transaction fees. Bitcoin uses PoW. While extremely secure, PoW is energy-intensive and produces slower block times (10 minutes for Bitcoin), making it less ideal for point-of-sale payment scenarios where speed matters.
Related Terms
Payment Channel
A payment channel allows multiple off-chain transactions between two parties, with only opening and closing settled on-chain — enabling micro-payments at near-zero cost.
Payment Gateway
A payment gateway facilitates the transfer of payment information between customer, merchant, and processor. Crypto payment gateways replace traditional card networks with faster, cheaper blockchain rails.
Peer-to-Peer (P2P)
Peer-to-peer means direct interaction between parties without an intermediary. Blockchain payments flow directly from sender to receiver without a bank in the middle.
Private Key
A private key is a cryptographic secret giving full control over a blockchain address. Anyone with the private key can move all funds — losing it means permanent loss of access.
Proof of Stake (PoS)
Proof of Stake is a consensus mechanism where validators stake crypto as collateral, offering faster blocks and lower fees than Proof of Work — critical for payment processing.
Public Key
A public key is the cryptographic counterpart to a private key, used to derive wallet addresses and verify transaction signatures. It can be shared openly.