HASH-3 (HASH-3)

"Hyper structure" is a concept in Web3 defining protocols that are unstoppable, free, and valuable, but it does not refer to a specific type of Proof of Work (PoW) algorithm. The primary algorithm used for general-purpose PoW is the SHA-256 cryptographic hash function, famously used by Bitcoin.
Proof of Work Algorithms
The "work" in PoW involves participants (miners) competing to solve a complex mathematical puzzle by finding a specific number (nonce) that, when hashed with the block data, produces a hash meeting a certain difficulty target. This is achieved through brute-force computation.
The most common algorithms used in PoW systems are:
SHA-256 (Secure Hash Algorithm 256-bit): The standard hash function for Bitcoin and many other blockchains. It is known for its high security and the computational effort required to solve its puzzles.
Ethash: The algorithm formerly used by Ethereum before its transition to Proof of Stake (PoS).
Scrypt: Used by cryptocurrencies like Litecoin, it was designed to be more memory-intensive than SHA-256 to potentially reduce the advantage of specialized ASIC mining hardware.
"Hyperstructure" and Useful Work
The term "hyperstructure" describes an open-source, universally accessible, and credibly neutral protocol that runs on an underlying blockchain. It is an architectural philosophy for Web3 services, not a consensus algorithm itself.
Separately, researchers are exploring Proof of Useful Work (PoUW), where the computational effort expended by miners solves real-world problems (e.g., decentralized optimization problems using algorithms like Doubly Parallel Local Search) instead of a "useless" cryptographic puzzle. This concept aims to address the high energy consumption associated with traditional PoW.