Skip to main content
5 votes
Accepted

How do custodial lightning wallets work?

I am sorry to say but your understanding is wrong. When you send x btc to Bluewallet you don't open a channel. You just give them your Bitcoin. Bluewallet and other custodial wallets run one (or ...
Rene Pickhardt's user avatar
4 votes

convert 12 word seed into 24 word seed

This is not possible. The mnemonic words are an encoding of the entropy used in the seed, essentially. A 12 word seed has less entropy than a 24 word one, so you cannot get 24 words out of it. ...
Raghav Sood's user avatar
  • 17.1k
4 votes

ECDSA signature with r value of 31?

This is valid, and there are even smaller types as well. Be aware that Bitcoin no longer really uses ASN.1 DER, but a even more restrictive subset of it. ASN.1 itself as it turns out is not ...
Claris's user avatar
  • 15.4k
3 votes
Accepted

C++ and secp256k1

Maybe libsecp256k1, which is what Bitcoin Core itself uses. Not sure about Android usability, but it compiles on many architectures.
Jannes's user avatar
  • 6,344
3 votes
Accepted

Full block chain on a mobile phone

There are two types of wallets: Full Node A full node client uses the peer-to-peer network to validate transactions and blocks and to relay information to other peers. To verify all transactions, ...
Monstrum's user avatar
  • 1,334
3 votes
Accepted

Claim Bitcoin cash from android bitcoin app

The Bitcoin Wallet project recently included detailed instructions on how to extract your key pairs for exactly this purpose. In the section Recovering from protobuf wallet format, skip to the ...
Synesso's user avatar
  • 160
2 votes

Create Android Alt Coin Wallet

Lightweight wallets use a simplified payment verification (SPV) mode which only requires them to download part of the blockchain so yes a full node is required,yes you can clone an existing opensource ...
roxy678's user avatar
  • 42
2 votes

Are there any POS coin open source mobile wallets implementations?

AFAIU, PoS is considered flawed by large parts of the cryptocurrency community. I've not kept abreast of POS coins, but some that I could think of are Peercoin, NXT and Blackcoin, which are currently ...
Murch's user avatar
  • 75.9k
2 votes

Claim Bitcoin cash from android bitcoin app

I have the same issue. I used OpenSSL to decrypt the file, gave the correct password and got org.bitcoin.production followed by a load of protobuf-serialized gibberish. I then processed the output ...
0lOl0's user avatar
  • 21
2 votes

Using a dedicated phone as "hardware wallet"

If your end goal is to wipe an old mobile phone to use exclusively as a cheap hardware wallet, I'd consider a Raspberry Pi. They can even be flashed to work exclusively as a Trezor device and can be ...
Justin F's user avatar
2 votes
Accepted

Using a dedicated phone as "hardware wallet"

Is a comparable level of security achievable with an Android device with full phone encryption? Short answer: No. This doesn't mean an Android device is bad, there are less secure ways to store ...
chytrik's user avatar
  • 18.3k
2 votes
Accepted

Connect to regnet from my WalletAppKit Android app

If you're connecting to a bitcoind regtest node and you're trying to connect as an RPC client to it via bitcoinj, it's possible. Figure out what your Android's IP address is, say x.y.z.w and use the -...
Alin Tomescu's user avatar
  • 1,337
2 votes
Accepted

How to display a list of incoming bitcoin Transaction history in my own wallet?

But How can I get the incoming Bitcoin Transaction Details which are perform out side my wallet? Unless you are using bitcoin-core wallet (e.g. listreceivedbyaddress), there isn't a way to query ...
JBaczuk's user avatar
  • 7,418
2 votes

how to validate testnet and mainnet bitcoin address via online api or offline for Android App?

Here are list of references to validate mainnet and testnet Bitcoin addresses: Offline IN JAVA https://rosettacode.org/wiki/Bitcoin/address_validation#Java (mainnet + testnet) https://github.com/...
Maroon5's user avatar
  • 55
2 votes

Wallet app disappeared from app store, is my money gone?

but is it safe to say my portfolio is lost if the developers don't restore the program We can categorise wallets into two major types Custodial Non-custodial A Custodial wallet is where some ...
RedGrittyBrick's user avatar
2 votes

How to send lightning payment request to lnurl from Android app with extra comment data?

The fine folks at Alby helped solve this -> First, add query intent to manifest: <queries> <intent> <action android:name="android.intent.action.VIEW" /> ...
bitanon's user avatar
  • 31
2 votes

Very old Bitcoin Wallet

There was also a mobile app by which i could watch in real time the blocks and transactions. The first Bitcoin app was probably Electrum in 2011 I dont remember what that app was maybe it was G-...
RedGrittyBrick's user avatar
1 vote

How to display a list of incoming bitcoin Transaction history in my own wallet?

The way I go now is to record the address in the wallet in mongodb, and then parse the address in the block and the database for comparison. If it is the address in the wallet, record it
老板鱼丸粗面's user avatar
1 vote

Bitcoinj Standard

It appears that it supports all of the above, see documentation: https://bitcoinj.github.io/javadoc/0.14.7/: BIP32 - Class HDKeyDerivation: Implementation of the BIP 32 deterministic wallet child key ...
JBaczuk's user avatar
  • 7,418
1 vote
Accepted

bitcoin transfer without creating wallet

Sure, this would work. That said, you are essentially building your own wallet - A wallet is simply a program that hold private keys, keeps track of spendable inputs, and signs transactions. Your ...
Raghav Sood's user avatar
  • 17.1k
1 vote

What multi-sig wallets are there for Android/Jolla?

If I go slightly of topic I will recomend you to incorporate a solution using a law of trusts if your law system has it incorporated. I am still about to recommend you Copay wallet as it is open-...
Comodore's user avatar
  • 568
1 vote

Can legacy wallets with 1xxx addresses send to segwit 3xxx and bc1xxx addresses like mycellium that only does 1xxx addresses?

Can I send out from my mycellium 1xxx address to my segwit 3xxx or bc1xxx address that I generated from a paper wallet? The 3xxx addresses are P2SH addresses, and they have been around since 2012. ...
Pieter Wuille's user avatar
1 vote

Build a wallet for Android and iOS for a self-made cryptocurrency

You first should learn how to create an android app if you don't know how to do that already. There are lots of resources available for this and better places to ask questions than the bitcoin ...
 mynt's user avatar
  • 106
1 vote
Accepted

How to create an offline wallet on Android only to sign transaction

you are doing all wrong from starting, do not use WalletAppKit use simple Wallet class, its offline wallet not Online, WalletAppKit needs internet to sync with the blockchain public void wallet() { ...
Zombie's user avatar
  • 548
1 vote

Bitcoin Wallet for Android - permission denied decrypting the wallet backup file using OpenSSL

It looks like you don't have the permissions to read the file bitcoin-wallet-backup-2017-12-25. Check your permissions on the file and make sure that your user is allowed to read the file.
Ava Chow's user avatar
  • 70.9k
1 vote

Full block chain on a mobile phone

There is a full node for Android. It is a wrapped version of Bitcoin Core maintained by the Greenaddress founder. You can find it here: Android Bitcoin Core If you run it in blocks-only and pruned ...
Murch's user avatar
  • 75.9k
1 vote

How to track multiple bitcoin addresses?

Electrum software (https://electrum.org/) has a watch-only function that can be used to track any public addresses, which should fit your needs. Also note that Electrum allows you to generate and ...
PPC's user avatar
  • 294
1 vote

How to track multiple bitcoin addresses?

usually you can use block explorers to display amounts of your different bitcoin addresses. I tend to go to "blockchain.info". As it is cumbersome to cut and paste everytime, I created a small (Linux/...
pebwindkraft's user avatar
  • 5,096

Only top scored, non community-wiki answers of a minimum length are eligible