BIP-32 and BIP-44 implementation for CKB
npm install ckb-hd-wallet  
  
This library generates CKB private/public keypairs from root xpriv and root xpub, conforming to bip-32 and bip-44
CKB coin_type is as specified in slip-44:
index | hex | symbol | coin
------|------------|--------|-----------------------------------
309 | 0x80000135 | CKB | Nervos CKB