8.5 铸造变异

图书盲盒的品质会受父母Vintage的影响：

bnft+bnft+卷轴 开始 mint

各品质bnft的mint组合	common书盒	uncommon书盒	rare书盒	epic书盒	legendary书盒
common&common	99%	1%	0%	0%	0%
common&uncommon	60%	39%	1%	0%	0%
uncommon&uncommon	30%	68%	2%	0%	0%
uncommon&rare	0%	60%	39%	1%	0%
rare&rare	0%	30%	68%	2%	0%
rare&epic	0%	0%	60%	39%	1%
epic&epic	0%	0%	30%	68%	2%
epic&legendary	0%	0%	0%	70%	30%
legendary&legendary	0%	0%	0%	35%	65%

用户打开图书盲盒后将获得新的图书NFT，图书NFT品质由图书盲盒品质决定：

书盒开出不同品质的书的概率

书盒品质	Mint common BNFT	Mint uncommon BNFT	Mint rare BNFT	Mint Epic BNFT	Mint Legendary BNFT
Common	99%	1%	0%	0%	0%
Uncommon	20%	79%	1%	0%	0%
Rare	0%	30%	69%	1%	0%
Epic	0%	0%	40%	59%	1%
Legendary	0%	0%	0%	50%	50%

图书NFT的属性是根据其品质，在一定范围内随机分配的。

铸造时有一定概率额外掉落一个图书盲盒。铸造次数越高，掉落多个图书盲盒的机会就越高。