On September 12, 2024, both Karlsen and Pyrin implemented a hard fork to change the mining algorithm. We will briefly explain what this means for you as a miner.

Karlsen (KLS) was the first to implement the most significant algorithm change. They introduced a modified version of Fishhash, called KarlsenHashV2, which will result in a hashrate nearly identical to Fishhash. Mining software such as Rigel (for Nvidia), lolMiner (for both Nvidia and AMD), and SRBMiner (for Nvidia, AMD, and Intel) have already integrated the new algorithm. Be sure to update your mining software to the latest version and switch the mining algorithm to the V2 variant. Check miner support for Karlsen Pyrin (PYI) made a minor adjustment to Pyrinhash to prevent ASICs from mining on the Pyrin blockchain, introducing the new algorithm, PyrinhashV2. We expect the hashrate to remain largely similar to Pyrinhash, although PyrinhashV2 may have up to 5% lower hashrate depending on your GPU architecture. Rigel (for Nvidia) and SRBMiner (for AMD and Intel) have already added support for PyrinhashV2, and we anticipate an updated version of lolMiner with support for both Nvidia and AMD to be released within the next few days. We plan to redo the benchmarks for PyrinhashV2, but as of this writing, our estimates will still be based on Pyrinhash (V1) figures. Check miner support for Pyrin


In conclusion, both Karlsen (KLS) and Pyrin (PYI) have made notable algorithm updates that will impact miners. Karlsen introduced KarlsenHashV2, a modified version of Fishhash, with a nearly identical hashrate. Most major mining software has already integrated support, so be sure to update and switch to the V2 variant. Meanwhile, Pyrin introduced PyrinhashV2 to deter ASIC mining, with minimal changes in hashrate, though a potential reduction of up to 5% is expected depending on GPU architecture. Updates for mining software are progressing, with full support expected shortly. Make sure to update your mining tools to optimize performance.