How to implement a mechanism for choosing inputs for a bitcoin transaction?

Question

bitcoin

You need to send bitcoin transactions using a private key. I found a solution for go , but only one tx of the previous transaction is indicated there, and not all inputs - it is not clear which algorithm for enabling inputs should be taken and how to implement it. Is there a solution/library to make it take optimal inputs by itself?

Answer 1

At the expense of an incomplete node: using the provider's public API. Receiving information from the network and broadcasting transactions will fall on his shoulders.
Now available:
chain.com
blockchain.info/en/api (not recommended)
www.blockcypher.com
chain.so/api
coinalytics.co
www.blocktrail.com
coinkite.com/developers