what's Freycoin?

Freycoin is a Proof-of-Work cryptocurrency that advances number theory research by directing mining efforts toward discovering large prime gaps, which are unusually wide spaces between consecutive prime numbers. Miners hash block headers to identify candidate starting primes, use segmented sieves and GPU pre-filters to scan for gaps, and verify primality with BPSW tests. Successful blocks require a gap meeting the network's merit difficulty (merit = gap size / ln(prime)), ensuring each block contributes a verifiable mathematical discovery to global databases tracked by researchers. This dual-purpose PoW secures the blockchain while producing data potentially useful for conjectures on prime distribution, cryptography, and millennium problems like the Riemann hypothesis. A spiritual successor to Gapcoin—created by Jonnie Frey, whom it honors—Freycoin is a ground-up reimplementation on Bitcoin Core 30.0 codebase (via Riecoin), incorporating modern features like SegWit, Taproot, and descriptor wallets. It supports CPU (SIMD) and GPU (OpenCL) mining via a built-in solo miner in the GUI wallet, eliminating pool needs due to unique gap discovery mechanics. Target block time is 150 seconds with dynamic per-block difficulty adjustment; rewards start at 50 FREY, halving every 840,000 blocks (~4 years) to ~84 million supply, followed by perpetual 0.1 FREY tail emission for ongoing security.