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Merge pull request #307 from cypherstack/fix/address

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Fix transactions with OP_RETURN and other edge case outputs
This commit is contained in:
Diego Salazar 2023-01-06 16:01:33 -07:00 committed by GitHub
commit ae9023b273
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 112 additions and 92 deletions
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33
lib/models/paymint/transactions_model.dart
View file

@ -362,12 +362,16 @@ class Input {
class Output {
// @HiveField(0)
final String? scriptpubkey;
// @HiveField(1)
final String? scriptpubkeyAsm;
// @HiveField(2)
final String? scriptpubkeyType;
// @HiveField(3)
final String scriptpubkeyAddress;
// @HiveField(4)
final int value;
@ -381,9 +385,6 @@ class Output {
factory Output.fromJson(Map<String, dynamic> json) {
// TODO determine if any of this code is needed.
try {
// Particl has different tx types that need to be detected and handled here
// if (json.containsKey('scriptPubKey') as bool) {
// output is transparent
final address = json["scriptPubKey"]["addresses"] == null
? json['scriptPubKey']['type'] as String
: json["scriptPubKey"]["addresses"][0] as String;
@ -392,35 +393,13 @@ class Output {
scriptpubkeyAsm: json['scriptPubKey']['asm'] as String?,
scriptpubkeyType: json['scriptPubKey']['type'] as String?,
scriptpubkeyAddress: address,
value: (Decimal.parse(json["value"].toString()) *
value: (Decimal.parse(
(json["value"] ?? 0).toString()) *
Decimal.fromInt(Constants.satsPerCoin(Coin
.firo))) // dirty hack but we need 8 decimal places here to keep consistent data structure
.toBigInt()
.toInt(),
);
// } /* else if (json.containsKey('ct_fee') as bool) {
// // or type: data
// // output is blinded (CT)
// } else if (json.containsKey('rangeproof') as bool) {
// // or valueCommitment or type: anon
// // output is private (RingCT)
// } */
// else {
// // TODO detect staking
// // TODO handle CT, RingCT, and staking accordingly
// // print("transaction not supported: ${json}");
// return Output(
// // Return output object with null values; allows wallet history to be built
// scriptpubkey: "",
// scriptpubkeyAsm: "",
// scriptpubkeyType: "",
// scriptpubkeyAddress: "",
// value: (Decimal.parse(0.toString()) *
// Decimal.fromInt(Constants.satsPerCoin(Coin
// .firo))) // dirty hack but we need 8 decimal places here to keep consistent data structure
// .toBigInt()
// .toInt());
// }
} catch (s, e) {
return Output(
// Return output object with null values; allows wallet history to be built

13
lib/services/coins/bitcoin/bitcoin_wallet.dart
View file

@ -1297,7 +1297,8 @@ class BitcoinWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2502,7 +2503,7 @@ class BitcoinWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
final address = out["scriptPubKey"]["address"] as String?;
final address = getAddress(out) as String?;
if (address != null) {
sendersArray.add(address);
}
@ -2513,7 +2514,7 @@ class BitcoinWallet extends CoinServiceAPI {
Logging.instance.log("sendersArray: $sendersArray", level: LogLevel.Info);
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["address"] as String?;
final address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2553,7 +2554,7 @@ class BitcoinWallet extends CoinServiceAPI {
int totalOutput = 0;
for (final output in txObject["vout"] as List) {
final String address = output["scriptPubKey"]!["address"] as String;
final String address = getAddress(output) as String;
final value = output["value"]!;
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
@ -2578,7 +2579,7 @@ class BitcoinWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["address"];
final address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
@ -3095,7 +3096,7 @@ class BitcoinWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
final address = output["scriptPubKey"]["address"] as String;
final address = getAddress(output) as String;
if (!addressTxid.containsKey(address)) {
addressTxid[address] = <String>[];
}

15
lib/services/coins/bitcoincash/bitcoincash_wallet.dart
View file

@ -1174,7 +1174,8 @@ class BitcoinCashWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2300,7 +2301,7 @@ class BitcoinCashWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
final address = out["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(out);
if (address != null) {
sendersArray.add(address);
}
@ -2311,7 +2312,7 @@ class BitcoinCashWallet extends CoinServiceAPI {
Logging.instance.log("sendersArray: $sendersArray", level: LogLevel.Info);
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2352,7 +2353,7 @@ class BitcoinCashWallet extends CoinServiceAPI {
int totalOutput = 0;
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
final value = output["value"];
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
@ -2377,9 +2378,9 @@ class BitcoinCashWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
final value = (Decimal.parse((output["value"] ?? 0).toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
.toInt();
@ -2902,7 +2903,7 @@ class BitcoinCashWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
String address = output["scriptPubKey"]["addresses"][0] as String;
String address = getAddress(output) as String;
if (bitbox.Address.detectFormat(address) ==
bitbox.Address.formatCashAddr) {
if (validateCashAddr(address)) {

42
lib/services/coins/coin_service.dart
View file

@ -307,4 +307,46 @@ abstract class CoinServiceAPI {
// used for electrumx coins
Future<void> updateSentCachedTxData(Map<String, dynamic> txData);
// Certain outputs return address as an array/list of strings like List<String> ["addresses"][0], some return it as a string like String ["address"]
String? getAddress(dynamic output) {
// Julian's code from https://github.com/cypherstack/stack_wallet/blob/35a8172d35f1b5cdbd22f0d56c4db02f795fd032/lib/services/coins/coin_paynym_extension.dart#L170 wins codegolf for this, I'd love to commit it now but need to retest this section ... should make unit tests for this case
// final String? address = output["scriptPubKey"]?["addresses"]?[0] as String? ?? output["scriptPubKey"]?["address"] as String?;
String? address;
if (output.containsKey('scriptPubKey') as bool) {
// Make sure the key exists before using it
if (output["scriptPubKey"].containsKey('address') as bool) {
address = output["scriptPubKey"]["address"] as String?;
} else if (output["scriptPubKey"].containsKey('addresses') as bool) {
address = output["scriptPubKey"]["addresses"][0] as String?;
// TODO determine cases in which there are multiple addresses in the array
}
} /*else {
// TODO detect cases in which no scriptPubKey exists
Logging.instance.log("output type not detected; output: ${output}",
level: LogLevel.Info);
}*/
return address;
}
// Firo wants an array/list of address strings like List<String>
List? getAddresses(dynamic output) {
// Inspired by Julian's code as referenced above, need to test before committing
// final List? addresses = output["scriptPubKey"]?["addresses"] as List? ?? [output["scriptPubKey"]?["address"]] as List?;
List? addresses;
if (output.containsKey('scriptPubKey') as bool) {
if (output["scriptPubKey"].containsKey('addresses') as bool) {
addresses = output["scriptPubKey"]["addresses"] as List?;
} else if (output["scriptPubKey"].containsKey('address') as bool) {
addresses = [output["scriptPubKey"]["address"]];
}
} /*else {
// TODO detect cases in which no scriptPubKey exists
Logging.instance.log("output type not detected; output: ${output}",
level: LogLevel.Info);
}*/
return addresses;
}
}

13
lib/services/coins/dogecoin/dogecoin_wallet.dart
View file

@ -1064,7 +1064,8 @@ class DogecoinWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2113,7 +2114,7 @@ class DogecoinWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
final address = out["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(out);
if (address != null) {
sendersArray.add(address);
}
@ -2124,7 +2125,7 @@ class DogecoinWallet extends CoinServiceAPI {
Logging.instance.log("sendersArray: $sendersArray", level: LogLevel.Info);
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2164,7 +2165,7 @@ class DogecoinWallet extends CoinServiceAPI {
int totalOutput = 0;
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
final value = output["value"];
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
@ -2189,7 +2190,7 @@ class DogecoinWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
@ -2712,7 +2713,7 @@ class DogecoinWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
final address = output["scriptPubKey"]["addresses"][0] as String;
final address = getAddress(output) as String;
if (!addressTxid.containsKey(address)) {
addressTxid[address] = <String>[];
}

30
lib/services/coins/firo/firo_wallet.dart
View file

@ -883,7 +883,8 @@ class FiroWallet extends CoinServiceAPI {
@override
Future<void> updateSentCachedTxData(Map<String, dynamic> txData) async {
final currentPrice = await firoPrice;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -1691,7 +1692,7 @@ class FiroWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
final address = output["scriptPubKey"]["addresses"][0] as String;
final address = getAddress(output) as String;
if (!addressTxid.containsKey(address)) {
addressTxid[address] = <String>[];
@ -2654,8 +2655,7 @@ class FiroWallet extends CoinServiceAPI {
final vouts = tx["vout"] as List?;
if (vouts != null && outputIndex < vouts.length) {
final address =
vouts[outputIndex]["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(vouts[outputIndex]);
if (address != null) {
addressesToDerive.add(address);
}
@ -2756,7 +2756,8 @@ class FiroWallet extends CoinServiceAPI {
var price = await firoPrice;
var builtHex = txb.build();
// return builtHex;
final locale =Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
return {
"transaction": builtHex,
"txid": txId,
@ -2810,7 +2811,8 @@ class FiroWallet extends CoinServiceAPI {
final currentPrice = await firoPrice;
// Grab the most recent information on all the joinsplits
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final updatedJSplit = await getJMintTransactions(cachedElectrumXClient,
joinsplits, _prefs.currency, coin, currentPrice, locale!);
@ -3249,7 +3251,8 @@ class FiroWallet extends CoinServiceAPI {
final currentPrice = await firoPrice;
final List<Map<String, dynamic>> midSortedArray = [];
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
Logging.instance.log("refresh the txs", level: LogLevel.Info);
for (final txObject in allTransactions) {
@ -3275,7 +3278,7 @@ class FiroWallet extends CoinServiceAPI {
// Logging.instance.log("sendersArray: $sendersArray");
for (final output in txObject["vout"] as List) {
final addresses = output["scriptPubKey"]["addresses"] as List?;
final addresses = getAddresses(output);
if (addresses != null && addresses.isNotEmpty) {
recipientsArray.add(addresses[0] as String);
}
@ -3319,8 +3322,8 @@ class FiroWallet extends CoinServiceAPI {
}
for (final output in txObject["vout"] as List) {
final addresses = output["scriptPubKey"]["addresses"] as List?;
final value = output["value"];
final addresses = getAddresses(output);
final value = output["value"] ?? 0;
if (addresses != null && addresses.isNotEmpty) {
final address = addresses[0] as String;
if (value != null) {
@ -3359,7 +3362,7 @@ class FiroWallet extends CoinServiceAPI {
final addresses = output["scriptPubKey"]["addresses"] as List?;
if (addresses != null && addresses.isNotEmpty) {
final address = addresses[0] as String;
final value = output["value"];
final value = output["value"] ?? 0;
// Logging.instance.log(address + value.toString());
if (allAddresses.contains(address)) {
@ -4375,7 +4378,8 @@ class FiroWallet extends CoinServiceAPI {
final lelantusEntry = await _getLelantusEntry();
final anonymitySets = await fetchAnonymitySets();
final locktime = await getBlockHead(electrumXClient);
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
ReceivePort receivePort = await getIsolate({
"function": "createJoinSplit",
@ -4742,7 +4746,7 @@ class FiroWallet extends CoinServiceAPI {
}
tx["amount"] = tx["vout"][sendIndex]["value"];
tx["address"] = tx["vout"][sendIndex]["scriptPubKey"]["addresses"][0];
tx["address"] = getAddress(tx["vout"][sendIndex]) as String;
tx["fees"] = tx["vin"][0]["nFees"];
tx["inputSize"] = tx["vin"].length;

18
lib/services/coins/litecoin/litecoin_wallet.dart
View file

@ -1299,7 +1299,8 @@ class LitecoinWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2513,7 +2514,7 @@ class LitecoinWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
final address = out["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(out) as String?;
if (address != null) {
sendersArray.add(address);
}
@ -2524,7 +2525,7 @@ class LitecoinWallet extends CoinServiceAPI {
Logging.instance.log("sendersArray: $sendersArray", level: LogLevel.Info);
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2564,9 +2565,8 @@ class LitecoinWallet extends CoinServiceAPI {
int totalOutput = 0;
for (final output in txObject["vout"] as List) {
final String address =
output["scriptPubKey"]!["addresses"][0] as String;
final value = output["value"]!;
final String address = getAddress(output) as String;
final value = output["value"] ?? 0;
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
@ -2590,9 +2590,9 @@ class LitecoinWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
final value = (Decimal.parse((output["value"] ?? 0).toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
.toInt();
@ -3107,7 +3107,7 @@ class LitecoinWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
final address = output["scriptPubKey"]["addresses"][0] as String;
final address = getAddress(output) as String;
if (!addressTxid.containsKey(address)) {
addressTxid[address] = <String>[];
}

27
lib/services/coins/namecoin/namecoin_wallet.dart
View file

@ -1287,7 +1287,8 @@ class NamecoinWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2494,11 +2495,7 @@ class NamecoinWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
String? address = out["scriptPubKey"]["address"] as String?;
if (address == null && out["scriptPubKey"]["address"] != null) {
address = out["scriptPubKey"]["address"] as String?;
}
String? address = getAddress(out);
if (address != null) {
sendersArray.add(address);
}
@ -2509,10 +2506,7 @@ class NamecoinWallet extends CoinServiceAPI {
Logging.instance.log("sendersArray: $sendersArray", level: LogLevel.Info);
for (final output in txObject["vout"] as List) {
String? address = output["scriptPubKey"]["address"] as String?;
if (address == null && output["scriptPubKey"]["address"] != null) {
address = output["scriptPubKey"]["address"] as String?;
}
String? address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2553,8 +2547,8 @@ class NamecoinWallet extends CoinServiceAPI {
for (final output in txObject["vout"] as List) {
Logging.instance.log(output, level: LogLevel.Info);
final address = output["scriptPubKey"]["address"];
final value = output["value"];
final address = getAddress(output);
final value = output["value"] ?? 0;
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
@ -2578,12 +2572,9 @@ class NamecoinWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
String? address = output["scriptPubKey"]["address"] as String?;
if (address == null && output["scriptPubKey"]["address"] != null) {
address = output["scriptPubKey"]["address"] as String?;
}
String? address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
final value = (Decimal.parse((output["value"] ?? 0).toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
.toInt();
@ -3101,7 +3092,7 @@ class NamecoinWallet extends CoinServiceAPI {
for (final output in tx["vout"] as List) {
final n = output["n"];
if (n != null && n == utxosToUse[i].vout) {
final address = output["scriptPubKey"]["address"] as String;
final address = getAddress(output) as String;
if (!addressTxid.containsKey(address)) {
addressTxid[address] = <String>[];
}

13
lib/services/coins/particl/particl_wallet.dart
View file

@ -1200,7 +1200,8 @@ class ParticlWallet extends CoinServiceAPI {
final priceData =
await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency);
Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero;
final locale = Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final locale =
Platform.isWindows ? "en_US" : await Devicelocale.currentLocale;
final String worthNow = Format.localizedStringAsFixed(
value:
((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) /
@ -2288,7 +2289,7 @@ class ParticlWallet extends CoinServiceAPI {
for (final out in tx["vout"] as List) {
if (prevOut == out["n"]) {
final address = out["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(out);
if (address != null) {
sendersArray.add(address);
}
@ -2302,7 +2303,7 @@ class ParticlWallet extends CoinServiceAPI {
// Particl has different tx types that need to be detected and handled here
if (output.containsKey('scriptPubKey') as bool) {
// Logging.instance.log("output is transparent", level: LogLevel.Info);
final address = output["scriptPubKey"]["addresses"][0] as String?;
final address = getAddress(output);
if (address != null) {
recipientsArray.add(address);
}
@ -2361,7 +2362,7 @@ class ParticlWallet extends CoinServiceAPI {
try {
final String address =
output["scriptPubKey"]!["addresses"][0] as String;
final value = output["value"]!;
final value = output["value"] ?? 0;
final _value = (Decimal.parse(value.toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
@ -2417,9 +2418,9 @@ class ParticlWallet extends CoinServiceAPI {
// add up received tx value
for (final output in txObject["vout"] as List) {
try {
final address = output["scriptPubKey"]["addresses"][0];
final address = getAddress(output);
if (address != null) {
final value = (Decimal.parse(output["value"].toString()) *
final value = (Decimal.parse((output["value"] ?? 0).toString()) *
Decimal.fromInt(Constants.satsPerCoin(coin)))
.toBigInt()
.toInt();