Is your feature request related to a problem? Please describe.
Currently the Asset struct assigns arbitrary, non-standard bytes to be used for asset identification by the server. It would be useful to include a standard that can be used for both BIP-0044 (as the HDCoinType) and the exchange (as an asset identifier). SLIP-0044 solves this problem, so it would make sense to implement this as the definition of the Asset struct.

Describe the solution you'd like
Implement SLIP-0044 as the definition of the Asset struct and make sure all of the cointypes that come from lit repo use it, or are compatible with the rest of opencx.

Describe alternatives you've considered
There do not seem to be many alternatives other than using the coin types in lit coinparams.

Additional context
N/A