# All Questions

23,117 questions
Filter by
Sorted by
Tagged with
7 views

### solidity programming related query [on hold]

I am learning Solidity on Cryptozombies, and while learning about structs, I've encountered that if I don't declare "String" and "uint" in this very specific order, it gives an error. Why so?
52 views

### Why does hashing public keys not actually provide any quantum resistance?

In the discussions about taproot, it was mentioned that outputs will include the public key directly instead of hashing them. It is stated that, currently, hashing does not really provide quantum ...
16 views

### Which wallets support double spending?

Which wallets support double spending? i.e. cancelling a transaction with 0 confirmations by using higher fees
14 views

### Metamask-like web3 inject for bitcoin

Is there a browser extension that works similarly to Ethereum's Metamask? I am wondering that if there isn't one, is it because of some technical limitation, or that just no one has gotten around to ...
25 views

### buying bitcoins with debit cards that are not mine

I have a couple of cards that are not mine, I have all of the card holders info and card info. I want to purchase bitcoins and then transfer them to other wallets. I have a couple of friendswho want ...
28 views

### Whose to stop the coinbase devs from just draining all accounts and running of with the money?

I have been wondering, what would happen if the coinbase developers agree to drain all the funds of all their accounts and run off into hiding? Its not like anybody will be able stop them or return ...
23 views

### How to import address to a wallet which runs in pruned mode

I am running Bitcoin Cash node with prune=99000 mode enabled. So, I tried to import addresses of BCH from another BCH wallet by using importprivkey method and I am getting an error: Rescan is disabled ...
49 views

### Can a blockchain's transactions be reversed?

Blockchains are often described as 'immutable' (meaning the history cannot be rewritten after the fact), but is this really true? How easy is it to change the history? I have read about the Etheruem ...
22 views

### How much time does it take for a Lightning node to forward an HTLC?

How much time passes between the moment an intermediary node receives an HTLC and the moment it forwards if to the next hop? At least what order of magnitude is it? Is it comparable with network-...
32 views

17 views

### What would be the effect on the number of leading zeros hash generation if bitcoin increase its nonce size from 32 to 60 or 100 bits?

If Bitcoin increases its nonce size from 32 bits to double or triple the size, how will it affect the speed of getting the right hash with the required number of zeros?
158 views

### How to create a bitcoin transaction without inputs

How can I create a transaction without inputs and it will be broadcasted but of course won't get confirmed? I would like the simplest method to do this
17 views

37 views

### How to programmatically send Bitcoins without requiring a local copy of the blockchain?

I'm quite new to Bitcoin development! I've seen the documentation about RPC commands, available when you have a local copy of the blockchain. But I'd like to know if it's possible to create and ...
33 views

### Bitcoin i have been asked to send money for a private key

Hi i have been asked to send money for funds that are nonspendable to receive a private key to unlock it, it's from bitcoin investing. How safe is this as i'm worried i wont receive the payment. It's ...
36 views

### Don't miners control who is allowed to make transactions?

Simple question really, considering theres a very small group of miners controlling the chain ATM. Whats to stop them from being forced by the goverment to disallow certain transactions or just mining ...
34 views

### How to Pay to Multisig Wallet Using python-bitcoinrpc?

How do I pay to a multisig wallet? I am using the Python API (based on python-bitcoinrpc) that ships with the bitcoin source code, in directory bitcoin/test/functional. I'm using regtest. I call ...
16 views

### Can someone please list apis to get UTXO for bitcoin testnet address, which are reliable? [on hold]

Need UTXO for tx.addInput() of transactionBuilder library
32 views

### Who store seed phrases data

Seed phrases seem to be pretty secure, approximately as strong as bitcoin private key according to this site https://en.bitcoin.it/wiki/Seed_phrase. But who store the private key adresses of these ...
333 views

### Should I verify the Bitcoin Core release signing keys?

I have been running Bitcoin Core on an old Macbook for about a year, and I updated to v0.18.0 a couple of months ago which I downloaded from bitcoin.org. I have recently been delving deeper and I ...
15 views

### Learning to trade iOS user friendly crypto wallet safety when stored in and transfer for trading or use to purchase or get cashed

iPhone users best crypto wallet in bitcoin currency trading and transfer for easy access to use and keep safe deposit and profits as a new and first time trading experience to the trading crypto ...
22 views

### Cannot call rpc api from other machine in same local network

cannot call rpc api from other machine in same local network There is a regtest node in my local network , I can call rpc api only from the node's machine,not my local machine. I know rpcallowip is ...
9 views

### Coinomi is giving an error message “no funds in wallet” which mycelium while sweeping for bitcoin cash?

I am trying to extract bitcoin cash from my old mycelium wallet. I created private keys using a website someone posted here. When I tried to sweep those keys for my cash it gave me an error message ...
21 views

### Coinbase support [on hold]

Does anyone have a better way to communicate with coinbase customer support? Like a phone number? I really don't want to through shade but it's unbelievably bad. Any suggestions.
31 views

### ED25519 HD wallet? [on hold]

https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki What changes are needed to set up a ED25519 based HD wallet, for example to generate Stellar addresses? I found this: https://...
39 views

### Why do I have to deposit BTC as missing turnover

I accidently transferred BTC to a non existing wallet. The wallet is now being created and I have to activate and verify it. To activate and verify I have to deposit 4,9 BTC. Is that how it works? Why ...
35 views

37 views

### Try to migrate Bitcoin Core wallet to an HD wallet but get “St13runtime” exception

I am trying to follow these steps to migrate my wallet to an HD wallet. But it failed, the debug log has errors like this: EXCEPTION: St13runtime_error DeriveNewSeed: AddKeyPubKey failed bitcoin in ...
27 views

### Does any one know a new coin which has a great value and it increasing day by day? [on hold]

I want to buy some Crypto coin which is new in market and it's not fake. The most important thing is it's value has to be increase day by day.
21 views

### Pharmaceutical products

Can pharmaceutical products be returned or sold to other customers using bitcoin as a form of payment if I was the seller. I am wondering because I am a pharmacist and have a lot of overstock and was ...
37 views

### Unconfirmed BTC transaction / TXID doesn't exist?

I recently tried sending some btc to coinbase. In a hurry I did not put a transaction fee. I've tried to explain to their customer support what is going on. I offered to charge me a fee through my ...
18 views

### My full node seems to be rejecting tor connections

I'm running my full node with bitcoin core v0.18.1 with a mostly default configuration on debian 9.11. Port 8333 is forwarded through my router and I have 20+ node connections, so can safely assume ...
122 views

### Other database besides UTXO?

In this post it is explained that the UTXO are removed after they are spent. This makes sense because they are not "unspent" anymore. But don't all UTXOs have a reference/connection to their ...
29 views

### Can BitML encode Lightning?

I have been reading the BitML paper. The language compiles to another language (Balzac [which in turn compiles to Bitcoin Script]), which can do relative and absolute timelocks. Balzac can also do ...
23 views

### Bitcoin qt 4.8.3

Hi I recently tried to make a transaction to a coinbase btc wallet from my bitcoin qt 4.8.3 node/wallet. In a hurry I didn't add a transaction fee. So the fee is zero. I see on my end the ...
17 views

### Sweep all functionality for a Bitcoin Lightning private key using mobile, desktop, or cli wallet?

Bitcoin wallets have a sweep all function to transfer all coins from one private key to another. Is there such a feature in a bitcoin lightning wallet where you can sweep all coins from a lightning ...
15 views

### What is the best lightning bitcoin wallet for Android and iOS as of 2019 Oct? [on hold]

Lightning Bitcoin has been out for a good year or so. Whats the best mobile wallet to use bitcoin lightning network?
39 views

### What does a Bitcoin lightning private key look like?

I know bitcoin private keys start with a 5... But how does a lightning bitcoin private key look like? Say I wanted to printed it out as a paper wallet.
25 views

### How to get all cryptocurrencies real-time statistics with no limit and free?

How can we get almost all real-time information of cryptocurrencies (rates, transactions, live prices, blocks info, wallets, etc) for developing new cryptocurrency statistics and exchange reference (...
13 views

### TimeoutError: [WinError 10060] when trying to connect to bitcoin rpc from a pc on the same local area network

I have a laptop with win10 installed. It is now running a full bitcoin node perfectly. I am already able to make rpc requests from the laptop using python and get valid responses. The laptop is ...
23 views

### Are there big stores in France or Europe going to accept Bitcoin? [on hold]

I want to know if more big stores in France or Europe will accept Bitcoin this year? I read that tobacco shops in France are going to sell Bitcoin: https://cryptobenelux.com/2019/10/11/5-200-...
29 views

### How is this 1 input 2 output tx larger than this 2 input 2 output tx?

A tx with only 1 input and 2 output is byte-wise smaller than a 2 input and 2 output tx. How is this possible? tx 1: https://blockstream.info/liquid/tx/...
95 views

I sent some Bitcoin to my friends wallet since 2 days ago. It says approved and sent successfully on my end. And even on blockchain Explorer it says confirmed and received. But my friend says he hasn'...
533 views

### How many paths are tried on average before a payment succeeds in Lightning?

In Lightning, the sender can never be sure that a multi-hop payment will go through, as intermediary nodes don't announce the distribution of funds in their channels (only the total capacity). Is ...
26 views

### Bitcoin Question

If I see the funds in my BlockChain wallet for example... I ask for $20 and see$20 in my wallet. Does that mean I don't have to wait for 3 confirmations and it's mine and mine to use now and they ...