What Is Blockchain?
Definition
A blockchain is a distributed, immutable digital ledger that records transactions across a network of computers — the foundational technology behind all cryptocurrencies and tokens.
A blockchain is a chain of data blocks where each block contains a set of transactions. Once a block is added, it cannot be changed or deleted — making the record permanent and tamper-proof. No single entity controls the blockchain; it runs on thousands of computers (nodes) simultaneously.
- Decentralized — no single point of failure or control
- Immutable — past transactions cannot be altered
- Transparent — anyone can read the full transaction history
- Permissionless — anyone can participate (send transactions, run a node)
- Solana — high-speed (400ms blocks), low-cost (<$0.01 per tx), SPL token standard
- Ethereum — largest smart contract platform, ERC-20 token standard, highest DeFi TVL
- Base — Ethereum L2 by Coinbase, same ERC-20 standard at 10-100x lower gas
When you create a token on CoinDevTools, it's recorded permanently on the blockchain. The token contract, metadata, pool creation, authority revocations — everything is on-chain, transparent, and verifiable by anyone.
Related Terms
Smart Contract
A smart contract is a self-executing program stored on a blockchain that automatically enforces the rules of an agreement when predefined conditions are met.
DeFi (Decentralized Finance)
DeFi is a category of blockchain-based financial services that operate without banks or intermediaries — including lending, borrowing, trading, and earning yield through smart contracts.
Mainnet
Mainnet is the live, production blockchain where real transactions with real value occur — as opposed to testnets (devnet, Sepolia) which use fake tokens for testing.
Gas (Transaction Fee)
Gas is the fee paid to blockchain validators for processing transactions. On Ethereum it's measured in gwei, on Solana it's called a priority fee — both compensate the network for computation.