"Layer 2" cryptocurrencies native to projects built on top of "layer 1" blockchains such as Bitcoin and Ethereum - have found a new lease of life after a year in the doldrums, buoyed by a rising crypto tide. Tokens associated with layer 2 projects - which typically aim to speed up transactions and cut costs - have a combined market cap of about $14.3 billion, about a tenth of the total crypto market, according to data from CoinMaketCap.com. Matic, the largest layer 2 token with a market cap of $6.90 billion, has jumped 20% to $0.74 over the past 30 days, according to CoinGecko.