What Is a Blockchain?

A blockchain is a shared digital ledger. Many independent computers (nodes) keep a copy of the same history of transactions. New entries are grouped into blocks, linked in order, and accepted only when the network agrees they are valid.

Why it matters

• Transparency — anyone can verify public transactions
• Integrity — changing past records requires rewriting a chain of blocks, which the network resists
• Programmability — smart contracts can enforce rules without a central operator

Accounts and keys

Users control accounts with private keys (usually held in a wallet app). The public address is safe to share; the private key must never be shared. Explorers show public activity for an address, but they never hold your keys.

ICB Network

ICB Network is one such blockchain. ICBScan indexes its public data so you can search and audit activity in a browser.