diff --git a/coinlib/lib/src/network.dart b/coinlib/lib/src/network.dart
index b58bdc8..ec75e04 100644
--- a/coinlib/lib/src/network.dart
+++ b/coinlib/lib/src/network.dart
@@ -16,6 +16,49 @@ class Network {
     required this.feePerKb,
   });
 
+  // copyWith function
+  Network copyWith({
+    int? wifPrefix,
+    int? p2pkhPrefix,
+    int? p2shPrefix,
+    int? privHDPrefix,
+    int? pubHDPrefix,
+    String? bech32Hrp,
+    String? messagePrefix,
+    BigInt? minFee,
+    BigInt? minOutput,
+    BigInt? feePerKb,
+  }) {
+    return Network(
+      wifPrefix: wifPrefix ?? this.wifPrefix,
+      p2pkhPrefix: p2pkhPrefix ?? this.p2pkhPrefix,
+      p2shPrefix: p2shPrefix ?? this.p2shPrefix,
+      privHDPrefix: privHDPrefix ?? this.privHDPrefix,
+      pubHDPrefix: pubHDPrefix ?? this.pubHDPrefix,
+      bech32Hrp: bech32Hrp ?? this.bech32Hrp,
+      messagePrefix: messagePrefix ?? this.messagePrefix,
+      minFee: minFee ?? this.minFee,
+      minOutput: minOutput ?? this.minOutput,
+      feePerKb: feePerKb ?? this.feePerKb,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'Network(\n'
+        '  wifPrefix: $wifPrefix,\n'
+        '  p2pkhPrefix: $p2pkhPrefix,\n'
+        '  p2shPrefix: $p2shPrefix,\n'
+        '  privHDPrefix: 0x${privHDPrefix.toRadixString(16)},\n'
+        '  pubHDPrefix: 0x${pubHDPrefix.toRadixString(16)},\n'
+        '  bech32Hrp: "$bech32Hrp",\n'
+        '  messagePrefix: "$messagePrefix",\n'
+        '  minFee: $minFee,\n'
+        '  minOutput: $minOutput,\n'
+        '  feePerKb: $feePerKb\n'
+        ')';
+  }
+
   static final mainnet = Network(
     wifPrefix: 183,
     p2pkhPrefix: 55,
diff --git a/coinlib/lib/src/scripts/operations.dart b/coinlib/lib/src/scripts/operations.dart
index 83430cb..9497620 100644
--- a/coinlib/lib/src/scripts/operations.dart
+++ b/coinlib/lib/src/scripts/operations.dart
@@ -1,9 +1,11 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/common/hex.dart';
 import 'package:coinlib/src/common/serial.dart';
 import 'package:coinlib/src/crypto/ec_public_key.dart';
 import 'package:coinlib/src/tx/inputs/input_signature.dart';
+
 import 'codes.dart';
 
 class InvalidScriptAsm implements Exception {}
@@ -153,6 +155,16 @@ abstract class ScriptOp {
   /// Returns true when the other [ScriptOp] matches this one.
   /// [ScriptPushDataMatcher] will match with a push data of a particular size.
   bool match(ScriptOp other);
+
+  @override
+  String toString() => "$runtimeType("
+      "compiled: $compiled, "
+      "asm: $asm, "
+      "number: $number, "
+      "ecdsaSig: $ecdsaSig, "
+      "schnorrSig: $schnorrSig, "
+      "publicKey: $publicKey"
+      ")";
 }
 
 /// Represents a [ScriptOp] that is an op code
diff --git a/coinlib/lib/src/scripts/program.dart b/coinlib/lib/src/scripts/program.dart
index e318037..35790a2 100644
--- a/coinlib/lib/src/scripts/program.dart
+++ b/coinlib/lib/src/scripts/program.dart
@@ -1,11 +1,12 @@
 import 'dart:typed_data';
+
+import 'programs/multisig.dart';
 import 'programs/p2pkh.dart';
 import 'programs/p2sh.dart';
 import 'programs/p2tr.dart';
+import 'programs/p2witness.dart';
 import 'programs/p2wpkh.dart';
 import 'programs/p2wsh.dart';
-import 'programs/p2witness.dart';
-import 'programs/multisig.dart';
 import 'script.dart';
 
 /// Thrown when a script doesn't match the program being constructed
@@ -61,6 +62,11 @@ abstract class Program {
       Program.match(Script.decompile(script, requireMinimal: requireMinimal));
 
   factory Program.fromAsm(String asm) => Program.match(Script.fromAsm(asm));
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script"
+      ")";
 }
 
 /// A program that is not recognised and merely wraps a [Script].
@@ -68,4 +74,9 @@ class RawProgram implements Program {
   @override
   final Script script;
   RawProgram(this.script);
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/multisig.dart b/coinlib/lib/src/scripts/programs/multisig.dart
index e9c38a1..d71bc08 100644
--- a/coinlib/lib/src/scripts/programs/multisig.dart
+++ b/coinlib/lib/src/scripts/programs/multisig.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/ec_public_key.dart';
 import 'package:coinlib/src/scripts/operations.dart';
@@ -102,4 +103,11 @@ class MultisigProgram implements Program {
       : this.fromScript(Script.decompile(compiled));
 
   MultisigProgram.fromAsm(String asm) : this.fromScript(Script.fromAsm(asm));
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "threshold: $threshold, "
+      "pubkeys: $pubkeys"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2pkh.dart b/coinlib/lib/src/scripts/programs/p2pkh.dart
index 6e86178..29bbf88 100644
--- a/coinlib/lib/src/scripts/programs/p2pkh.dart
+++ b/coinlib/lib/src/scripts/programs/p2pkh.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/ec_public_key.dart';
 import 'package:coinlib/src/crypto/hash.dart';
@@ -34,4 +35,10 @@ class P2PKH implements Program {
   P2PKH.fromPublicKey(ECPublicKey pk) : this.fromHash(hash160(pk.data));
 
   Uint8List get pkHash => Uint8List.fromList(_pkHash);
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "pkHash: $_pkHash"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2sh.dart b/coinlib/lib/src/scripts/programs/p2sh.dart
index ce3b562..f8092aa 100644
--- a/coinlib/lib/src/scripts/programs/p2sh.dart
+++ b/coinlib/lib/src/scripts/programs/p2sh.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/hash.dart';
 import 'package:coinlib/src/scripts/operations.dart';
@@ -33,4 +34,10 @@ class P2SH implements Program {
       : this.fromHash(hash160(redeemScript.compiled));
 
   Uint8List get scriptHash => Uint8List.fromList(_scriptHash);
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "scriptHash: $_scriptHash"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2tr.dart b/coinlib/lib/src/scripts/programs/p2tr.dart
index 6b7dbc5..2a41423 100644
--- a/coinlib/lib/src/scripts/programs/p2tr.dart
+++ b/coinlib/lib/src/scripts/programs/p2tr.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/ec_public_key.dart';
 import 'package:coinlib/src/scripts/program.dart';
@@ -29,4 +30,12 @@ class P2TR extends P2Witness {
   P2TR.fromTaproot(Taproot taproot) : this.fromTweakedKey(taproot.tweakedKey);
 
   ECPublicKey get tweakedKey => ECPublicKey.fromXOnly(data);
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "version: $version, "
+      "data: $data, "
+      "tweakedKey: $tweakedKey"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2witness.dart b/coinlib/lib/src/scripts/programs/p2witness.dart
index a53a69c..780e3dd 100644
--- a/coinlib/lib/src/scripts/programs/p2witness.dart
+++ b/coinlib/lib/src/scripts/programs/p2witness.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/scripts/operations.dart';
 import 'package:coinlib/src/scripts/program.dart';
 import 'package:coinlib/src/scripts/script.dart';
@@ -53,4 +54,11 @@ class P2Witness implements Program {
   /// The data of the "witness program". It is called "data" and not "program"
   /// to avoid confusion with the more general [Program] class.
   Uint8List get data => Uint8List.fromList(_data);
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "version: $version, "
+      "data: $data"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2wpkh.dart b/coinlib/lib/src/scripts/programs/p2wpkh.dart
index 4b5e412..fd0a534 100644
--- a/coinlib/lib/src/scripts/programs/p2wpkh.dart
+++ b/coinlib/lib/src/scripts/programs/p2wpkh.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/ec_public_key.dart';
 import 'package:coinlib/src/crypto/hash.dart';
@@ -24,4 +25,12 @@ class P2WPKH extends P2Witness {
   P2WPKH.fromPublicKey(ECPublicKey pk) : this.fromHash(hash160(pk.data));
 
   Uint8List get pkHash => data;
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "version: $version, "
+      "data: $data, "
+      "pkHash: $pkHash"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/programs/p2wsh.dart b/coinlib/lib/src/scripts/programs/p2wsh.dart
index 5807425..c165e42 100644
--- a/coinlib/lib/src/scripts/programs/p2wsh.dart
+++ b/coinlib/lib/src/scripts/programs/p2wsh.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/crypto/hash.dart';
 import 'package:coinlib/src/scripts/program.dart';
@@ -27,4 +28,12 @@ class P2WSH extends P2Witness {
       : this.fromHash(sha256Hash(witnessScript.compiled));
 
   Uint8List get scriptHash => data;
+
+  @override
+  String toString() => "$runtimeType("
+      "script: $script, "
+      "version: $version, "
+      "data: $data, "
+      "scriptHash: $scriptHash"
+      ")";
 }
diff --git a/coinlib/lib/src/scripts/script.dart b/coinlib/lib/src/scripts/script.dart
index af213a6..1cebe02 100644
--- a/coinlib/lib/src/scripts/script.dart
+++ b/coinlib/lib/src/scripts/script.dart
@@ -1,6 +1,8 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/serial.dart';
 import 'package:collection/collection.dart';
+
 import 'operations.dart';
 
 class Script {
@@ -84,4 +86,10 @@ class Script {
 
   ScriptOp operator [](int i) => ops[i];
   int get length => ops.length;
+
+  @override
+  String toString() => "$runtimeType("
+      "ops: $ops, "
+      "asm: $asm"
+      ")";
 }
diff --git a/coinlib/lib/src/tx/inputs/input.dart b/coinlib/lib/src/tx/inputs/input.dart
index c471b79..cbb2e53 100644
--- a/coinlib/lib/src/tx/inputs/input.dart
+++ b/coinlib/lib/src/tx/inputs/input.dart
@@ -1,7 +1,9 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/serial.dart';
 import 'package:coinlib/src/scripts/script.dart';
 import 'package:coinlib/src/tx/outpoint.dart';
+
 import 'input_signature.dart';
 import 'p2pkh_input.dart';
 import 'p2sh_multisig_input.dart';
@@ -54,4 +56,12 @@ abstract class Input with Writable {
       return null;
     }
   }
+
+  @override
+  String toString() => "$runtimeType("
+      "prevOut: $prevOut, "
+      "scriptSig: $scriptSig, "
+      "sequence: $sequence, "
+      "signedSize: $signedSize"
+      ")";
 }
diff --git a/coinlib/lib/src/tx/outpoint.dart b/coinlib/lib/src/tx/outpoint.dart
index 73bf644..bd2a11e 100644
--- a/coinlib/lib/src/tx/outpoint.dart
+++ b/coinlib/lib/src/tx/outpoint.dart
@@ -1,8 +1,10 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/common/bytes.dart';
 import 'package:coinlib/src/common/checks.dart';
 import 'package:coinlib/src/common/hex.dart';
 import 'package:coinlib/src/common/serial.dart';
+
 import 'output.dart';
 
 /// Reference to an [Output] by transaction hash and index
@@ -45,4 +47,10 @@ class OutPoint with Writable {
   @override
   int get hashCode =>
       _hash[1] | _hash[2] << 8 | _hash[3] << 16 | _hash[4] << 24 | n;
+
+  @override
+  String toString() => "$runtimeType("
+      "hash: $_hash, "
+      "n: $n"
+      ")";
 }
diff --git a/coinlib/lib/src/tx/output.dart b/coinlib/lib/src/tx/output.dart
index a8118fe..aeee7c8 100644
--- a/coinlib/lib/src/tx/output.dart
+++ b/coinlib/lib/src/tx/output.dart
@@ -1,4 +1,5 @@
 import 'dart:typed_data';
+
 import 'package:coinlib/src/address.dart';
 import 'package:coinlib/src/common/checks.dart';
 import 'package:coinlib/src/common/serial.dart';
@@ -57,4 +58,11 @@ class Output with Writable {
   }
 
   Uint8List get scriptPubKey => Uint8List.fromList(_scriptPubKey);
+
+  @override
+  String toString() => "Output("
+      "value: $value, "
+      "scriptPubKey: $_scriptPubKey, "
+      "program: $program"
+      ")";
 }
diff --git a/coinlib/lib/src/tx/transaction.dart b/coinlib/lib/src/tx/transaction.dart
index c0c7b72..99c1a84 100644
--- a/coinlib/lib/src/tx/transaction.dart
+++ b/coinlib/lib/src/tx/transaction.dart
@@ -466,4 +466,18 @@ class Transaction with Writable {
     required int blockHeight,
   }) =>
       !locktimeIsEnforced || locktime.isUnlocked(medianTime, blockHeight);
+
+  @override
+  String toString() => "Transaction("
+      "version: $version, "
+      "locktime: $locktime, "
+      "isWitness: $isWitness, "
+      "isCoinBase: $isCoinBase, "
+      "isCoinStake: $isCoinStake, "
+      "complete: $complete, "
+      "hashHex: $hashHex, "
+      "txid: $txid, "
+      "inputs: $inputs, "
+      "outputs: $outputs"
+      ")";
 }