Implement Schnorr Checksig / CheckDatasig Modifications to the Scripting System

CHANGELOG.md

@@ -1,9 +1,19 @@
 # Bcash Release Notes & Changelog
 
+## v1.2.0
+
+This release includes:
+- May 15th upgrade
+  - Implement Schnorr Signatures on both OP_CHECKSIG, OP_CHECKDATASIG Opcodes.
+  - Implement Segwit Script Recovery Mechanism.
+  - Remove VERIFY_COMPRESSED_PUBKEY from Script Standardness Checks.
+  - Update bcrypto
+  - bug fixes
+
 ## v1.1.0
 
 This release includes:
-- Nov 15 upgrade 
+- Nov 15 upgrade
   - Implement and enforce canonical transaction order.
   - Add OP_CHECKDATASIG and OP_CHECKDATASIGVERIFY.
   - Enforce minimum transaction size of 100 bytes.

lib/blockchain/chain.js

@@ -552,6 +552,12 @@ class Chain extends AsyncEmitter {
       state.flags |= Script.flags.VERIFY_CLEANSTACK;
     }
 
+    if (mtp >= this.network.block.greatWallActivationTime) {
+      state.greatWallActivation = true;
+      state.flags |= Script.flags.VERIFY_SEGWIT_RECOVERY;
+      state.flags |= Script.flags.VERIFY_SCHNORR;
+    }
+
     return state;
   }
 
@@ -589,6 +595,9 @@ class Chain extends AsyncEmitter {
 
     if (!this.state.hasMagneticAnomaly() && state.hasMagneticAnomaly())
       this.logger.warning('Magnetic Anomaly has been activated.');
+
+    if (!this.state.hasGreatWallActivation() && state.hasGreatWallActivation())
+      this.logger.warning('Great Wall has been activated.');
     this.state = state;
   }
 
@@ -2929,6 +2938,7 @@ class DeploymentState {
     this.bip34 = false;
     this.daa = false;
     this.magneticAnomaly = false;
+    this.greatWallActivation = false;
   }
 
   /**
@@ -3012,6 +3022,15 @@ class DeploymentState {
     return this.magneticAnomaly;
   }
 
+  /**
+   * Test whether great wall activation is active.
+   * @returns {Boolean}
+   */
+
+  hasGreatWallActivation() {
+    return this.greatWallActivation;
+  }
+
   /**
    * Get max block size
    * @returns {Number}

lib/mempool/mempool.js

@@ -1020,14 +1020,23 @@ class Mempool extends EventEmitter {
       return;
 
     if (flags & Script.flags.ONLY_STANDARD_VERIFY_FLAGS) {
-      flags &= ~Script.flags.ONLY_STANDARD_VERIFY_FLAGS;
+      flags &= ~Script.flags.ONLY_STANDARD_VERIFY_FLAGS
+             | Script.flags.VERIFY_SEGWIT_RECOVERY;
 
       if (await tx.verifyAsync(view, flags, this.workers)) {
         throw new VerifyError(tx,
           'nonstandard',
           'non-mandatory-script-verify-flag',
           0);
       }
+
+      if (await tx.verifyAsync(view,
+        flags ^ Script.flags.VERIFY_SCHNORR, this.workers)) {
+        throw new VerifyError(tx,
+          'invalid',
+          'upgrade-conditional-script-failure',
+          0);
+      }
     }
 
     throw new VerifyError(tx,

lib/net/common.js

@@ -122,12 +122,12 @@ exports.REQUIRED_SERVICES = 0
 exports.USER_AGENT = `/bcash:${pkg.version}/`;
 
 /**
- * Max message size (~4mb with segwit, formerly 2mb)
+ * Max message size (2MB)
  * @const {Number}
  * @default
  */
 
-exports.MAX_MESSAGE = 1 * 1000 * 1000;
+exports.MAX_MESSAGE = 2 * 1024 * 1024;
 
 /**
  * Amount of time to ban misbheaving peers.