Equium ($EQM) is a Solana-based SPL token distributed via Equihash 96,5 proof-of-work. The on-chain program runs a mining round approximately every 60 seconds. The first participant to submit a valid Equihash solution whose SHA-256 falls under the current difficulty target receives the block reward of 25 EQM. The reward halves every 378,000 blocks (approximately every 8.6 months at the one-minute target block time). Equihash 96,5 is a memory-bound proof-of-work algorithm. Each solve consumes approximately 50 MB of working state across 131,072 BLAKE2b-derived leaves processed through Wagner's birthday-attack algorithm. The memory-bandwidth bottleneck limits ASIC specialization and keeps GPU and CPU performance within an order of magnitude of each other. Difficulty retargets every 60 blocks. The protocol compares actual elapsed time against the 3,600-second target window and adjusts the target within a [0.5x, 2x] clamp per retarget, mirroring Bitcoin's retarget convention with damping tuned for the shorter window. Total supply is capped at 21,000,000 EQM. 10% (2,100,000 EQM) was pre-minted at launch for DEX liquidity; the remaining 18,900,000 EQM resides in a program-owned vault and is released exclusively through mining rounds. Reference miners are open-source under Apache-2.0: - Native Rust GPU CLI built on wgpu (Metal on macOS, Vulkan on Linux/Windows, DX12 on Windows; optional CUDA backend for NVIDIA hardware). - Multi-threaded Rust CPU CLI. - WebGPU browser miner with a three-tier fallback (full-GPU, hybrid GPU/CPU, WASM workers). Mainnet program: ZKGMUfxiRCXFPnqz9zgqAnuqJy15jk7fKbR4o6FuEQM Mint: 1MhvZzEe8gQ8Rb9CrT3Dn26Gkn9QRErzLMGkkTwveqm Source: github.com/HannaPrints/equium