add safety checks, explicitly set api port for regtest, make sure to remove register op's spent input from utxo set
add safety checks, explicitly set api port for regtest, make sure to remove register op's spent input from utxo set

blockstack/blockstack-browser,blockstack/blockstack-browser,blockstack/blockstack-portal,blockstack/blockstack-portal,blockstack/blockstack-portal,blockstack/blockstack-portal,blockstack/blockstack-browser,blockstack/blockstack-browser,blockstack/blockstack-browser,blockstack/blockstack-portal,blockstack/blockstack-browser