Auto merge of #1017 - ebfull:coinbase-must-be-protected, r=ebfull

Enforce that coinbases must be protected

This PR forces miners to place their funds in the private value transfer system, making "transparent coins" opt-in for users, and increasing privacy for all participants on a systemic level.

Closes #101.

src/chainparams.cpp

@@ -31,6 +31,7 @@ class CMainParams : public CChainParams {
 public:
     CMainParams() {
         strNetworkID = "main";
+        consensus.fCoinbaseMustBeProtected = true;
         consensus.nSubsidySlowStartInterval = 20000;
         consensus.nSubsidyHalvingInterval = 840000;
         consensus.nMajorityEnforceBlockUpgrade = 750;
@@ -210,6 +211,7 @@ class CRegTestParams : public CTestNetParams {
 public:
     CRegTestParams() {
         strNetworkID = "regtest";
+        consensus.fCoinbaseMustBeProtected = false;
         consensus.nSubsidySlowStartInterval = 0;
         consensus.nSubsidyHalvingInterval = 150;
         consensus.nMajorityEnforceBlockUpgrade = 750;