All Questions

1
vote
1answer
31 views

What is transaction “finality”?

bitcoind IsFinalTx() as seen here checks the properties of a transaction in this order: Is nLockTime exactly 0? That's final. return. If it's not 0, is it below the current block height / time? If so,...
1
vote
1answer
34 views

How exactly do I decode the block file info in leveldb?

Base on the links https://github.com/bitcoin/bitcoin/blob/fcbc8bfa6d10cac4f16699d6e6e68fb6eb98acd0/src/main.h#L392 and What are the keys used in the blockchain levelDB (ie what are the key:value ...
0
votes
0answers
12 views

Blockchain Payment Has Been Unconfirmed Please Help [duplicate]

Could someone please help me with this trancaction, i sent it via bitmex and not sure how to use fee bump. https://www.blockchain.com/btc/tx/...
0
votes
1answer
18 views

EstimateSmartFee returning same amount, regardless of conf_target

Running 18.0 on Testnet, fully synced at 1541869 blocks. bitcoin-cli estimatesmartfee 10 { "feerate": 0.00001014, "blocks": 10 } bitcoin-cli estimatesmartfee 50 { "feerate": 0.00001014, "...
0
votes
1answer
10 views

BlockUntilSyncedToCurrentChain: txindex is catching up on block notifications

The message "BlockUntilSyncedToCurrentChain: txindex is catching up on block notifications" is appearing regularly in my debug.log. When these messages appear, I can be sure that lnd will not be able ...
1
vote
1answer
26 views

Why a specific bitcoin value of a tx message appears in source IP address and then comes to same IP address as the destination address?

Sometime back, I created two wallets on two distinct cellphones. I sent a specific bitcoin value (A bitcoin) from one cellphone to another one. During this process, I captured the entire traffic. ...
0
votes
1answer
16 views

Read an XPUB list of transactions to Python using my own node

Anyone familiar with a Python library that can get a list of all transactions under an XPUB but by connecting to a Bitcoin node through RPC?
1
vote
2answers
36 views

How to check the balance of the list of 1 million Bitcoin Addresses?

How to check the balance of the list of 1 million Bitcoin Addresses? Is there such a program?
3
votes
1answer
41 views

How many nodes is too many?

Has anyone done the math on this? For example, if we had 10’s of millions of nodes all connecting to 8 peers would there be some latency issues in propagating blocks across the network in the 10 ...
-2
votes
0answers
20 views

Multiple sources

Hi can someone help me I have multiple wallets and transactions that I'm not sure how to confirm them so I get the Bitcoin ,dogecoin. Please help
2
votes
1answer
19 views

How to parse values in block index leveldb?

So I'm trying to read the block files with Python. From this link, What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?, it tells you how to access the files with ...
0
votes
0answers
27 views

why a specific transaction value and it's output address which is sent from a specific IP address, returns from another address to that IP address? [duplicate]

I wrote a code to extract bitcoin output addresses and their values from TX messages of the bitcoin protocol. to test it, I prepare this scenario: first I send a specific bitcoin value(for example A ...
0
votes
1answer
35 views

Does Bitcoin Core still use “Bitcoin seed” in addition to a seed like stated in BIP 32?

In BIP 32 it's stated that a Master Private key is generated by hashing the concatenation of a random seed and the string "Bitcoin seed". And is like so in the example implementations. But I couldn't ...
0
votes
0answers
30 views

Bitcoin doesn't create tor hidden service

Configuring Bitcoin 0.18 node in a brand new Whonix VM on latest Qubes R4.0. Trying to make Bitcoin create a hidden tor service following method 1 here. Also followed what was applicable here. ...
1
vote
1answer
20 views

How to get balance for a label

I have lots of addresses organized under a label. Is there a command to show the total remaining amount available under a label ? (Or address) I am building a payment gateway and I need get the total ...
1
vote
1answer
20 views

bitaddress.org paper wallet vs. single wallet

After generating a single wallet (at bitaddress.org), the paper wallet option at the top shows a different public address? Why is the public address different?
2
votes
1answer
77 views

Is there a flag or specific message in a bitcoin pcap to show us our bitcoin transaction is confirmed or not?

Assume that I send a specific value from a source wallet to a destination wallet and simultaneously capture the input and output traffic with Wireshark. I can extract output address and it's value ...
2
votes
1answer
41 views

Why do aggregate Schnorr signatures reverse the hash and the random number

A bitcoin signature has: z = hash(m) Using a private key pk we can generate a signature for message m consisting of two numbers: r (x coordinate of the random point R = k×G) and s = (z+r⋅pk)/k. ...
2
votes
1answer
91 views

Is there a reason to why Bitcoin Core does not implement BIP39?

Is there a specific reason to why BIP39 isn't added to Bitcoin Core? Seems very trivial to add and am confused to why it isn't there.
4
votes
1answer
48 views

How can I make transaction output time locked?

Is it possible to submit some coins to some address and make them spendable after some period of time? Like I want submit 1btc to address 1Kc24m... and make that output to be spendable after january ...
0
votes
0answers
21 views

My Bitcoin client has stopped syncing

As you can see my client is stuck on 99,7% with unknown. Syncing Headers(577895), It has been in this state since last day synced(which you can see). How can I get it to work since I have plenty of ...
0
votes
1answer
46 views

System requirements for running a Bitcoin Core node on testnet

What are the minimum systems requirements for running a Bitcoin Core full node on testnet?
2
votes
1answer
20 views

Why is not possibile to convert a signed transaction into psbt?

In the bitcoin core doc is explicitly said that conversion from hex to psbt are only allowed for unsigned transactions, or, at most, passing a signed one with the permitsigdata param set to true, but ...
1
vote
1answer
96 views

How to calculate the size of multisig transaction?

Can you help or suggest the formula for calculation of simple multi-sig transactions? I have an issue to calculate the size of multi signature 2-2 transaction. I tried to follow this: Predict ...
0
votes
0answers
25 views

Shamir SSSS how to split the example if i want to use 12 Bits instead of 11 Bits?

Shamir Mnemonics are encoded into 3 components - the Version, the Parameters, and the Shamir Share. The encoded components are concatenated together to form a Shamir Mnemonic. First Component is ...
0
votes
2answers
38 views

How can I accept Bitcoin as a payment without a 3rd party gateway

I want to create a website where users can pay with Bitcoin. However I want to create my own payment gateway because I do not want to rely on services like BitPay. I want a unique BTC address for ...
-1
votes
0answers
34 views

Where can I see the unconfirmed RawTX blockchain?

Is there such a service or website? Where can I see the unconfirmed RawTX blockchain?
2
votes
3answers
59 views

Why can't an intermediary Lightning node take (nearly) all fees?

Consider a Lightning payment: Alice wants to pay 100 sat to Dave via two intermediary hops: Alice - Bob - Charlie - Dave. Both Bob and Charlie advertise a fee of 2 sat. Alice sends 104 sat to Bob, ...
0
votes
1answer
25 views

What's the purpose of CSHA256::Write and CSHA256::Finalize

Looking at Bitcoin Core implementation of SHA256, I noticed it was a bit different from OpenSSL's implementation. In OpenSSL, you would initialize a variable with SHA256_CTX when in Bitcoin Core it's ...
0
votes
1answer
32 views

Stay on memory pool when I sending multiple transaction from bitcoin wallet

I run the bitcoin client 0.17.1 on my ubuntu 18.04 desktop. I have some balance in my wallet. Also my client is fully synced.I have face the wallet conflict. When I send multiple transaction at once(...
1
vote
3answers
49 views

What is the order in which UTXOs are sorted in a block?

Let's say, I am trying to do a double spend by creating two transactions almost immediately, is it possible that both the transactions are added in one block ? If yes, then which transaction is valid ...
2
votes
1answer
39 views

Is signature/private-key required to accept payment over Lightning Network?

To (1) create an invoice and (2) accept payment in LN, the node has to be online. But does the node need to sign the creating invoice or the accepting payment? We don't have to have private key ...
0
votes
0answers
82 views

cant send btc, Uneconomical UTXO requested

Im trying to send btc worth of 2$ and i keep getting message "Uneconomical UTXO requested [type: 1 (limit 46629), txOut.val: 38546, required: 83847]" i even tried sending 1$ but its still the same can ...
1
vote
1answer
27 views

How to request a list of blocks using bitcoin-cli?

I'm trying to figure out how to use bitcoin-cli effectively to request a list of 50 blocks. As far as I am aware, bitcoin-cli getblock list does not work. Also how to best extract information out of ...
1
vote
1answer
16 views

Having trouble transfering private keys from Bitcoin Core to Electrum, for want of not having to wait for sync

This morning, I purchased some bitcoin for the first time on CEX.IO, and soon withdrew it to the Bitcoin Core wallet I had set up. What I did not realise was that I would have to download the ...
1
vote
1answer
20 views

Can I explicitly specify a path for Lightning payment?

From what I understand, in the current Lightning implementations payments work as follows: calculate best N paths according to some metric (like, total fees); try to perform the payment through the ...
1
vote
2answers
26 views

Can a malicious Internet Service provider launch a double spend attack?

If a malicious internet service provider completely controls a user's connection, can it launch a double-spend attack against the user? How much computational effort would this take?
0
votes
1answer
23 views

bitcoin full nodes vs simplified payment verification

Why do individual nodes run "full nodes" that keep track of the entire blockchain whereas mechants can get away with "lite node" that implements "simplified payment verification" needing to examine ...
-1
votes
2answers
77 views

Bitcoin goes Zero? [closed]

If the Bitcoin goes zero in value, Many crypto holders an investors will jump off the bridge i guess. Because they earn in Bitcoin now and planning to earn more in the future. But what if the Bitcoin ...
0
votes
1answer
17 views

Retrieve number of OP-RETURN transaction

Is there a possible way to extract the bitcoin transaction protocoll with Python and extract specifically OP RETURN transaction? I want to plot the number of those over the course of time to derive ...
1
vote
1answer
25 views

Confused about buy/sell definition in trades history

I'm looking at some trade history provided by the kraken.com API (formatting mine): Price Volume Time Buy/sell Limit/market Remarks ["7833.00000", "0.17400000", 1559721453....
0
votes
1answer
42 views

How can I reverse a Bitcoin transaction mistakenly sent to the wrong address?

I bought a bitcoin cash at a place called Bithumb in Korea and mistakenly copied the bitcoin address and sent it to the wrong. Obviously my fault is, but the fact that I can't get the cancellation ...
0
votes
1answer
21 views

Testnet credentials

How to get testnet credentials to use bit-coin core functions in Node.js. { "Bitcoin": { "testnet": { "username": "name", "password": "sdaddf", "network": "regtest", ...
2
votes
1answer
21 views

Lightning Network on testnet - listchannels and listnodes returning empty values

I have setup a lightning node on testnet using c-lightning. The lightning-cli getinfo command output: { "id" : "0315a5746114ab9f3e8f0a3f2f73153ef1e4a8fb58daa54fa97c9603dfab989a30", "alias" : "...
0
votes
0answers
12 views

Margin Trading on Huobi maximum holding time of loans

I have tried to find this everywhere on Huobi, but somehow its not listed anywhere on their Website. So for those of you who are new to margin trading. basically it is taking a loan from an exchange ...
0
votes
2answers
23 views

Where are the non-scriptPubKey outputs in the chainstate leveldb?

I read https://bitcoindev.network/understanding-the-data/ and it explain that the leveldb of the chainstate contain transaction with at least one unspent output. And it has "The scriptPubKey and ...
2
votes
1answer
50 views

Why is a privacy problem to pay always to the same address?

I know as a merchant it is not a good idea to receive all payments to the same address because then people could track our balance. But I don't understand why it could be a privacy problem if we ...
-1
votes
0answers
21 views

Coins list with date of creation

I'm looking for an up-to-date list of all coins/cryptocurrency. Their is https://coinmarketcap.com/coins/views/all/ but I'm interested to see when they was made public. Other informations like which ...
1
vote
0answers
24 views

how do I mark coins spent in invalid blocks as unspent?

I was just testing bitcoin (v17) in regtest mode with the local, built-in wallet. If I send money to an address (I don't own), generate 1, and then invalidate that block, the local wallet does not ...
1
vote
1answer
30 views

Why is so expensive to buy Bitcoin with Credit Card?

There are many sites accepting credit cards to buy Bitcoin, but they charges a huge fee, sometimes is more than 10% (and I think never less than 5%). Why is that? what is the problem with buying ...

15 30 50 per page