Double SHA-256 Checksum Calculator

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Supports all file types. Double SHA-256 can be calculated for any file.

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What is Double SHA-256?

Double SHA-256 is a cryptographic hash function that applies the SHA-256 algorithm twice to the input data. It's widely used in Bitcoin and other blockchain applications for enhanced security and collision resistance.

How It Works

First pass: Input data is hashed using SHA-256
Second pass: The resulting hash is hashed again using SHA-256
Produces a fixed-length 64-character hexadecimal string
Provides enhanced security through double hashing

Common Uses

Bitcoin and blockchain applications
Block header hashing in Bitcoin mining
Transaction verification in blockchain networks
Enhanced cryptographic checksums
Security-critical applications requiring extra protection

Security Features

Enhanced collision resistance through double hashing
Protection against length extension attacks
Increased security margin for preimage attacks
Fixed-length output regardless of input size