This was tested with go1.19.3 . The minimum required go version to build
this code is now 1.17 . This code includes mempool support and
should be compatible with hush-android-wallet-sdk .
Code was ported from https://github.com/zcash/lightwalletd commit 5d174f7feb702dc19aec5b09d8be8b3d5b17ce45