Bitcoin's price isn't the only metric testing new all-time highs.

The Lightning Network, a second-layer payment protocol on Bitcoin designed to speed up payment transactions, has experienced a recent surge in U.S. Dollar capacity, gaining 37% in the last month alone, according to data from The Block. However, bitcoin capacity on the network fell 5% over the same period. 

Currently, the Lightning Network has nearly $325 million in U.S. dollar capacity, a notable all-time high, while bitcoin capacity, currently at 4,680, is 17% lower than its all-time high, according to The Block's data. The increase in capacity in U.S. dollar terms is somewhat unsurprising, as bitcoin tests new all-time high price levels. Previous records for Lightning Network capacity also corresponded with …