Tokens associated with Bitcoin layer 2 solutions have outperformed bitcoin (BTC) since the Bitcoin blockchain’s highly-anticipated mining reward halving took effect early Saturday. STX, the native token of leading Bitcoin layer 2 network Stacks, has risen nearly 20% to $2.87 since quadrennial halving reduced the per block coin emission to 3.125 BTC from 6.25 BTC, according to data source CoinGecko. Bitcoin, meanwhile, has gained just over 4.7% to $66,300. STX is one of the best-performing top 25 cryptocurrencies of the past 24 hours, per Velo Data. Other layer 2 coins, like Elastos’ ELA token and SatoshiVM’s…