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SHA-256 stands for "Secure Hash Algorithm 256-bit." It’s a cryptographic hash function, which means it takes any input—like a string of text, a file, or blockchain data—and turns it into a fixed-size, 256-bit (32-byte) output called a hash. This hash looks like a random string of numbers and letters (e.g., 1a2b3c...), but it’s unique to the input. Change even one character, and the hash completely changes. In simple terms: Purpose: It’s a one-way process—easy to compute the hash from the input, but impossible to reverse-engineer the input from the hash. Use: In Bitcoin (and potentially your chain), miners use SHA-256 to secure blocks by finding a hash that meets a specific condition (like starting with enough zeros), proving they’ve done the “work” in proof-of-work. Why 256?: The “256” refers to the length of the output in bits, making it super secure—there are 2^256 possible hashes, so collisions (two inputs giving the same hash) are practically nonexistent. Think of it like a digital fingerprint: unique, compact, and tamper-proof.