Merge #20157: Bugfix: chainparams: Add missing (always enabled) Taproot deployment for Signet

2d5793c Bugfix: chainparams: Add missing (disabled) Taproot deployment for Signet (Luke Dashjr)

Pull request description:

  Is there a way we can trigger compiler warnings if a deployment is undefined?

ACKs for top commit:
  decryp2kanon:
    utACK 2d5793c
  MarcoFalke:
    review ACK 2d5793c

Tree-SHA512: 135cefae0f8dc552b0f682c2b87cabca7a4716290a36410a55968850e803a5049234e3cc597c8ef8d7917ae5d5ea3fb851e160df171b6793114c6bc01c5ea3e7

Author: MarcoFalke

src/chainparams.cpp

@@ -330,6 +330,11 @@ class SigNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
 
+        // Activation of Taproot (BIPs 340-342)
+        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+
         // message start is defined as the first 4 bytes of the sha256d of the block script
         CHashWriter h(SER_DISK, 0);
         h << consensus.signet_challenge;