Every NFT card in HashLand is collateralize by Bitcoin hashrate and HC token hashrate ( HC is the governance token of HashLand). HashLand NFT provides hashrate income while being an valuable collectible. Users only need to insert the NFTs into slots to gain perpetual Bitcoin mining reward. HashLand NFT is also upgradable. Every 4 level-1 NFT Cards can be upgraded to a level-2 NFT card, same goes for level-3,4,and 5. Mining yield increases as the level gets higher and higher. Higher level cards are also rarer, and features way more hashrate. Do noted that when you upgrade from level 1 to level 2, not only the btc multiplier increases from 100%-110% to 110%-120%, the card will begin producing HC token as well.