Solana transaction ordering rule SIMD-0649 stalls

By Michael FawnA proposed rule for Solana transaction ordering, known as SIMD-0649, stalled on September 25, 2026, after its pull request closed without merging. This development means block producers, also called leaders, on the Solana network will maintain their full discretion over which transactions enter a block and how they are batched. CryptoSlate Editor-in-Chief Liam ‘Akiba’ Wright reported on this issue two days later.The decision postpones efforts to implement a more predic