Sarchar, the "version" values your BIP32 implementation uses for DOGE/DOGE-testnet and LTC/LTC-testnet, are these in some specification somewhere or is this your own? I'm implementing BIP32 for some alts and I'm curious what version values I ought to use.

I see in Base58 yours result in: Ltpv, Ltub, dgpv, dgub prepended to the extended keys. Ok so I get the convention you're using -- first two characters denote coin, ub/pv denote public/private. Is this a standard defined or discussed somewhere? The testnet version strings are problematic since yours are: ttpv, ttub, tgpv, tgub. This leaves only one character to denote the coin and in these cases already it's awfully ambiguous.

For altcoins something like XXmP/XXmp to denote mainnet public/private keys (where XX is the coin code) and XXtP/XXtp to denote testnet public/private keys would at least leave two characters to denote the coin.

DGmP/DGmp, DGtP/DGtp, LTmP/LTmp, LTtP/LTtp?

What are your thoughts?