standaone cennznet utils #419
Description
need a small package for cennznet/evm development.
it should be split from here so it doesn't have the complexity of the @polkadot packages (i.e. usable with current ethereum dapps without any changes)
functions needed:
- evm to cennznet address conversion
- generic asset id to address
- nft id to address
derive NFT address
AAAAAAAA + bytes(collectionId) + bytes(seriesId) + padRight(0, 4)
derive GA address
CCCCCCCC + bytes(assetId) + padRight(0, 12)
e.g. 16000 = 0xCCCCCCCC00003e80000000000000000000000000
cc #411