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What if John McAfee is right about 1 Bitcoin = 1 million USD by late 2020? Will this “Bitcoin halving” be the catalyst?

The next Bitcoin Halving will take place on May 20th 2020. It will be the third time, that the block reward of the most known blockchain will be halved. As a consequence, miners will earn 50 percent ...
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0answers
9 views

BITCOIN MINING POOL OPERATION CONCERN

I have contributed Bitcoin into a mining pool that was being promoted on Instagram. The miner of the pool informed me that the process consists of 5 cycles. He set an initial amount of Bitcoin to be ...
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17 views

large amount of bitcoin exhange [closed]

I just received a large amount of bitcoin. 300+ coins. I am in the US - colorado specifically. How can I exchange that for cash? And are their limits on the amounts that trigger the authorities?
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0answers
7 views

bitcoin core test config error

I tried configuring the bitcoin core test by editing the bitcoin.conf file with the required credentials. Earlier, before the writing the test credentials it was a running full node. now the error is ...
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0answers
15 views

Where to put IP address of full node [closed]

My new altcoin is almost ready. I've got a full node up and running, and I'm wondering how people will connect to it. What do I have to do?
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0answers
13 views

funds are not available

I am checking the transaction https://www.blockchain.com/en/btc/tx/245258a7f9df05645c34f4e6322909ab90690c63eaf518ce98eee332e89348cb The status is confirmed.   In my wallet: 2/7/20 22:35 Unconfirmed. ...
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1answer
14 views

How do people using thin clients know the correct merkle path of transactions they've sent without knowing the full block?

User A send a transaction to user B. Those transactions are bundled together into a merkle tree. User A and B can both use the transaction plus the merkle root, plus the merkle path to prove the ...
2
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1answer
24 views

Problem caused by unconfirmed transaction chains

I want to build a service that requires sending many small bitcoin transactions to multiple wallets (like a faucet). Since the transactions are small, the fees have to be kept small as well so it ...
2
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0answers
31 views

After a sleeping client comes online again which technique it uses to find the last common ancestor in a blockchain?

I have a Bitcoin client running on my PC and I turn it off. When I turn it on again how does it find the last common block in the blockchain so that it knows which blocks it should obtain?
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1answer
25 views

Segwit with Multisig

I was analyzing a Bitcoin transaction that works both with Segwit and non-Segwit for multisig Scripts. Here is the transaction: https://www.blockchain.com/en/btc/tx/...
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27 views

contract to exchange bitcoin for eth

I'm thinking about a decentralized service to exchange bitcoin for eth or any other ERC20 token. Probably something that bisq already does. Let's say A wants to sell 1 BTC for 5 ETH to B. Both have ...
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0answers
19 views

wat does this mean replace-by-fee [closed]

Problem with blockchain Today i login and found my btc gone when i check transactions it shows btc sent to some wallet with replace by fee is my btc gone? and why
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0answers
14 views

Whats the best way to exchange ETN for either USD or BTC? [closed]

I recently recieved some ETN from selling a task on AnyTask.com and I would like to convert it to somehthing I can actually use... I tried KuKoin and its just so darn complicated! Is there an easier ...
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0answers
13 views

having a problem with python code,bitcoin, (pip install bitcoin),ill bold the area where I think my issue is

I want to save a wallet, here is a small code as an example, I do not know where the code begins or ends here, and whether to paste this in the command interface, or the text editor like is mentioned ...
0
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1answer
32 views

How does a miner’s pubkey get passed into miner.cpp?

I understand that a miner using an application like pooler’s cpuminer can set a Coinbase-txn address where new coins that are generated to. I’m trying to override this setting in the code of the core ...
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0answers
8 views

How to configure rpcallowip with rpcbind - version 0.17.0

I'm trying to understand the difference between rpcallowip and rpcbind. I run bitcoind v0.17.0 in bitcoin.conf, I have: rpcport=8332 rpcallowip=0.0.0.0/0 which should allow every connection from ...
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1answer
19 views

Where do I include my wallet address after finding the hash less than target - bitcoin

Please help me understand the logic behind mining a bitcoin from scratch. I want to create a bitcoin miner, it will not receive any blocks from any pools. All should be done inside the miner. So, I ...
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0answers
18 views

Sent bitcash to bitcoin coin address given by coinfy from my bit wallet can they trace funds and return them or is it impossible [duplicate]

Hi I sent bitcash instead of bitcoin to coinfy bit coin address they gave by mistake should of bitcoin.. it's completed hash tag etc.. I was told the mix up was from my wallet to them (being new to ...
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0answers
41 views

Question to Marco Falke and to other Bitcoin Core developpers and/or reviewers [closed]

Dear Bitcoin community members, I will explained briefly the reason why I am writing here. I am working as a PhD student on the functioning of cryptocurrency governance. I'm trying to document two ...
1
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1answer
38 views

Sign transaction legacy with Openssl

I want to understand how Bitcoin sign transactions with Openssl. I saw this post But I have some issues. Above my private and public keys. Private keys: $ cat chiave_priv_3.pem -----BEGIN EC ...
0
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1answer
11 views

Doesn't overt AsicBoost reduce the search space for a valid block header hash?

ASICBoost is a new method to mine bitcoins with a 20% speedup, as covered in this article: https://blog.bitmex.com/an-overview-of-the-covert-asicboost-allegation-2/ Now, consider the following ...
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2answers
24 views

how to use bitcoind “walletnotify” for unique transactions only

while using bitcoind "walletnotify" my curl command is getting 3 hits generating 3 unique transaction hashes but requirement is to execute only once for unique transactions. I heard about ...
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0answers
19 views

Sign Raw Segwit (P2WPKH) Transaction Digest

I have a simple transaction that I want to sign the digest of, but I'm not sure if I've got the raw transaction correct, therefore my digest is incorrect. The transaction has one input and one output,...
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1answer
10 views

Exact syntax for lightning-cli txprepare

I have tried many different forms but I cannot prepare a transaction with lightning-cli txprepare from the Linux prompt. lightning-cli txprepare [{\"bc1qvzr0mwps952d0cdmchyd2pe5rlee5tfces5dzf\":\"all\...
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0answers
11 views

Mathematics behind sidechain SPV skiplist proof attack

I am reading about verifying SPV proofs of a sidechain where we don't want to verify all N blocks of the sidechain. In the example instead of verifying that each block meets the target difficulty (...
0
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1answer
28 views

Double SHA256 giving me an incorrect value with this code VB.net

I'm trying to build a bitcoin miner. I have generated the message successfully, but I can't get the double SHA256 correctly. The value I'm getting is incorrect. What is wrong with this code? Private ...
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0answers
18 views

Is it possible, with bitcoin-core or btcd, to manually set the scriptSig field in a coinbase transaction?

I am talking about when using regtest or simnet modes. For context, it is so that I can create coinbase transactions with reproducible txids.
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0answers
17 views

Can anyone help? [duplicate]

My friend said he sent me 0.077 BTC, but i have only received 0.037 BTC. The Bitcoin explorer shows that there are 2 output, one of 0.037 going to my BTC address, another 0.039 went to a different ...
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1answer
10 views

bitcoin-cli createwallet electrumpersonal server true

I'm a noob following instructions to setup Electrum Personal Server on Linux. I came to this instruction and I'm stuck. Got an warning. What is this? { "name": "electrumpersonalserver", "...
2
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1answer
20 views

why is my p2sh raw transaction not being mined or erroring ERROR: 64: NON-MANDATORY-SCRIPT-VERIFY-FLAG (EXTRA ITEMS LEFT ON STACK AFTER EXECUTION?

I created this 2-of-2 multi-signature address for testnet following the instructions on the book Programming Bitcoin. I tried to spend the funds in this address following the standard forms (...
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0answers
15 views
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0answers
17 views

Why blockchain proejcts establish foundations?

I saw alot of foundations related to many blockchain projects. Why did they do? In my opinion, it is better to establish a company than a foundation.
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1answer
25 views

If i have 42 tera hashes of mining power, how long will it take me to mine a block solo, and if i join a mining pool, how much bitcoin will I get?

If i have 42 tera hashes of mining power, how long will it take me to mine a block solo, and if i join a mining pool, how much bitcoin will I get? I am intrested in buying 4 Bitmain Antminer T9+.
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1answer
33 views

How to get private key and Bitcoin address in pure Python - without modules?

How to make a pure Python code for Bitcoin address and private key without modules? For now I learn only how from decimal to get a hex. How from hex to private key WIF and than Bitcoin address? bits ...
0
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1answer
28 views

Is it possible to handle BCH transactions on Bitcoin Core wallet? [closed]

I've installed Bitcoin Core on a server and it works well for BTC. I would like to know can I use the same server and platform to support BCH too? I know that the addresses generated in Bitcoin Core ...
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0answers
15 views

bech32 address not showing in watch-only wallet (using HWI descriptors)

First of all thanks for all the awesome tools. Especially Andrew Chow and Sjoors Provoost, for my use case. Now, I´m a little confused. A transaction I sent from a mobile wallet to a watch only wallet ...
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0answers
13 views

Step by Step to Connect to ElectrumX via Nodejs

I am developing a simple app that will need to retrieve BTC wallet Address Balance and relative transactions Initially I thought to use some existing APIs (btc.com, blockchain.com etc.), but the ...
1
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1answer
14 views

Re-index/Re-download from specific height?

I seem to have discovered corrupt blocks on one of my nodes. The node is on all the time to keep up to sync and the rest of my nodes connect to it to retrieve block data when they need to sync. The ...
0
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1answer
17 views

Are the indexes generated by txindex=1 persisted to disk?

I'm running bitcoind with the option -txindex. $ bitcoind -txindex it seems to be taking around a day to fully index the whole blockchain. (I'm using a raspberry pi 4, 4GB of Ram, with an external ...
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0answers
18 views

Chance of a word repeating THREE times in a BIP39 Mnemonic passphrase? And what about 2 words repeating 2 times each?

So according to the other thread about BIP39 repeating words, the cahnce of a word repeating TWICE is 11.7%. Now I was wondering, since my passphrase may or may not contain THREE repetitions :O. And ...
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3answers
58 views

Loosing your bitcoins due to a glitch on your mycelium app, and how do you get the back without a backup?

I went and purchased some bitcoins on my mycelium wallet. Once I went back to my car and opened the app to do a backup for it the app just stopped working and it wouldn't open back up. I couldn't do ...
0
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0answers
13 views

Bitcoin core node not sending outbound connections only inbound traffic

My bitcoin core is not sending outbound connections. It's only getting inbound connections. Iv deleted the whole node then reinstalled it. Still it was only getting inbound connections. Iv checked ...
0
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1answer
25 views

How can I perform key derivation from a 130 characters hex public key?

I'm working with a hardware wallet (Keycard) and I'm able to export a 130 characters hex public key of the path m/44'/0'/0'. Now, I need to perform account discovery, and in order to do it I first ...
0
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0answers
17 views

GeForce GTX 780 desktop pc vs. old dell and toshiba laptops

I'm curious as to why when I mine Satoshis with the app "Bitcoin Miner" with my gaming computer I get slower or = to the hashrate that my older laptops are getting.. I assumed it would be 10x faster ...
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0answers
8 views

Recovering an armory wallet from paper

Nice to meet you :) I'm struggling to recovering a relative old armory wallet (1.35 paper backup with 4 lines). Apparently there is an error in line one but check it up and rewrite it many times. No ...
0
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1answer
29 views

Bitcoin UTXO anatomy

I've been using a command line tool to fetch spendables from a Bitcoin address. Given an address the following command (source) ouptuts UTXOs the address can spend. tx -i ...
1
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1answer
22 views

How do I get Raw Transaction Txid, Scriptpubkey Using Bitcoin Core Console

I just finished downloading bitcoin core on windows 7 and I am trying to create a raw transaction. When I typed listunspent 0 or listunspent 1 on console, I got no message (empty message) in the ...
0
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0answers
18 views

Please help me. Problem with my account [closed]

I have received an email from blockchain team that my account is deleted. Why it is happend? How can i access to my funds. Please help me.
0
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2answers
42 views

What prevents a knowledgeable person from modifying their bitcoin data?

The average person would not have the knowledge, but what is the mechanism that stops a programmer capable of writing a wallet, from modifying the local bitcoin file/data to be, for example, 10 ...
0
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1answer
23 views

Does restoring wallet.dat require the same paths and configs in servers?

I have a Bitcoin core server (Server 1) which is working well. Now I am testing backing up and restoring its wallet on a new server (Server 2). Imagine that the server 1 has these configs: ...

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