I notice some code are quite the same for example here seems taken from here, it would be better to give a reference somewhere in your project.

Yep, base58 module stands for transaction signing stuff which is mostly derived from steem-python. It's already written in the earlier announcement posts and related pull requests.

For example, beem has a similar base58.py and bitshares-python has the same, and goes on. Also steem-python's base58 module is based on cryptocoins project, etc.

However, also adding somewhere in the project would make sense since this is not the first time I hear that.

Thanks.