Blockchain Security
What Is Blockchain Security?
Blockchain security refers to the measures used to protect blockchain networks, which rely on a decentralized, cryptographically linked ledger of transactions distributed across many participants rather than a single central authority.
How Blockchain Provides Security
Because each block is cryptographically linked to the previous one and copies are distributed across a network, altering historical data would require changing every subsequent block across a majority of the network - making tampering extremely difficult.
Common Blockchain Security Risks
| Risk | Description |
|---|---|
| Smart Contract Vulnerabilities | Bugs in contract code can be exploited to steal funds |
| 51% Attacks | An entity gaining majority control of network computing power |
| Private Key Theft | Losing control of a private key means losing control of associated assets |
Why Blockchain Isn't Automatically Secure
While the underlying structure is resilient, security still depends on properly written smart contracts, secure key management, and well-designed consensus mechanisms.
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