diff --git a/metro.config.js b/metro.config.js
index c3b0e12..45de989 100644
--- a/metro.config.js
+++ b/metro.config.js
@@ -2,7 +2,7 @@ const { getDefaultConfig } = require('expo/metro-config');
 
 const config = getDefaultConfig(__dirname);
 
-// Enable debug logging and better error reporting
+// Configure supported platforms for module resolution
 config.resolver.platforms = ['ios', 'android', 'native', 'web'];
 
 // Polyfill Node.js modules for React Native
@@ -24,13 +24,15 @@ config.transformer.minifierConfig = {
 config.server = {
   enhanceMiddleware: (middleware) => {
     return (req, res, next) => {
-      console.log(`[Metro] ${req.method} ${req.url}`);
+      if (process.env.NODE_ENV !== 'production') {
+        console.log(`[Metro] ${req.method} ${req.url}`);
+      }
       return middleware(req, res, next);
     };
   },
 };
 
-// Enable better error handling
+// Configure Metro transformer options for imports and inline requires
 config.transformer.getTransformOptions = async () => ({
   transform: {
     experimentalImportSupport: false,
diff --git a/services/rbf-service.ts b/services/rbf-service.ts
index 077d4e8..cf114f6 100644
--- a/services/rbf-service.ts
+++ b/services/rbf-service.ts
@@ -18,6 +18,13 @@ let bip32Module: unknown = null;
  */
 const NON_RBF_SEQUENCE = 0xFFFFFFFF;
 
+/**
+ * Minimum required fee increase (as a fraction of the original fee)
+ * to consider a replacement transaction for RBF.
+ * For example, 0.1 means a 10% minimum fee increase.
+ */
+const MIN_RBF_FEE_INCREASE_RATE = 0.1;
+
 /**
  * Validates the given ECC library by checking basic functionality.
  * Throws an error if validation fails.
@@ -36,8 +43,6 @@ function validateECCLibrary(ecc: any): void {
   if (!publicKey || publicKey.length !== 33) {
     throw new Error('ECC point generation failed');
   }
-
-  console.log('✅ ECC library validation passed');
 }
 
 export interface RBFTransaction {
@@ -54,7 +59,7 @@ export interface RBFValidationResult {
   isValid: boolean;
   canReplace: boolean;
   reason?: string;
-  originalTx?: any;
+  originalTx?: Transaction;
   utxos?: UTXO[];
 }
 
@@ -519,7 +524,7 @@ export async function createReplacementTransaction(
     
     // Ensure the new fee meets RBF requirements (must be higher than original)
     // Only apply minimum increase if user's requested fee is too low
-    const minFeeIncrease = Math.ceil(originalFee * 0.1); // 10% increase minimum for RBF
+    const minFeeIncrease = Math.ceil(originalFee * MIN_RBF_FEE_INCREASE_RATE); // minimum increase for RBF
     const actualTargetFee = Math.max(targetFee, originalFee + minFeeIncrease);
     
     const feeIncrease = actualTargetFee - originalFee;