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4 views

How to quickly get the balance of any bitcoin address? (with no third-party API)

As some people have mentioned (eg. here), the only way to get the balance of an address in bitcoin core was to import it as a watch-only address and rescan the blockchain. Starting with bitcoin core ...
1
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1answer
12 views

What happen if some blocks are added simultaneously with same previous hash

In all of the blockchain samples that I see e.g. adilmoujahid, Savjee as I checked, they added previous Hash by creating a block. Suppose that, L is the current last block in a chain. Block A and ...
-1
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0answers
6 views

i am try to call a method in solidity smart contract through angular app. but i unable to call the method. this is the error i get in console

i am try to call a method in solidity smart contract through angular app. but i unable to call the method. can someone please help me. this is the error i get in console TypeError: this.contract....
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0answers
4 views

In PoS, why does a block header need to be signed by the miner?

I am reading the following article about PoS http://earlz.net/view/2017/07/27/1904/the-missing-explanation-of-proof-of-stake-version In this article, the author says The block hash must be ...
3
votes
1answer
18 views

OP_HASH160 vs OP_SHA256

Why would I use OP_HASH160 over OP_SHA256 and vice versa? Why are there two options? In what situations should I use one over the other? Example unlocking scripts: From BIP199: ( where HASHOP could ...
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0answers
12 views

How can I use backup up chain data from pruned node to set up (archivial) node without IBD?

My setup is an old (~2012) laptop + small SSD and a NAS with HDDs. I noticed that trying to sync Bitcoin Core (v0.18) on the NAS was slow, but on SSD was very fast. (Everything is connected via ...
1
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2answers
279 views

Bitcoin migrating to a ASIC resistant mining algorithm like RandomX used on Monero

What would need to happen for Bitcoin to fork to a ASIC resistant mining algorithm like RandomX used by Monero for CPU mining only?
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0answers
8 views

What are some potential scenarios that a state actor can harm bitcoin if they control more than 51% of the hashing power?

As reported recently, China controls more than 51% of the hashing power and just in one province in China controls 54%. Assuming China has bad intentions and forces all these mining operators to ...
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0answers
9 views

Get a “No timer handler registered for RPC” error when running regtest

(Bitcoin Core version v0.19.0.1 on Windows) I use regtest=1 to run some tests. I'm unable to reproduce the error on demand, but it seems to occure when I haven't interact with the running bitcoind ...
1
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1answer
17 views

Get transaction data from full node

Background Information I am building an application that requires the ability to query any bitcoin full node (from a python script using raw tcp sockets) in order to read the OP_Return value listed ...
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0answers
16 views

Why hasn't cold storage (offline signing) been supported by Bitcoin Core (GUI) up till now (0.19.0.1)?

Is there any deep reason not to support this? Or is this merely a "good idea, but no volunteers" situation? By the way, although Bitcoin Core had supported BIP32 several years ago, it uses hardened ...
-3
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0answers
24 views

How this “Fake transaction generater” works? [closed]

Someone sent me a fake bitcoin sender. He told me it's using P2SH to generate scripts.Its a QT console C++ program and it used openssl.But I checked the code I didnt see anything to send transaction....
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0answers
10 views

Insertion of ref codes to bitcoin account [closed]

How do I get the reference codes to insert to my account? I need to insert ref codes into my account. How do I do that?
2
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0answers
22 views

Is lack of version number really a flaw of BIP39?

It seemed that BIP39 was often criticized as it lacks version number. However, wasn't BIP39 supposed to be universal, that "one single seed covers all purposes, one single seed backups everything"? ...
3
votes
1answer
30 views

Why is a 20 byte hash acceptable in p2wpkh but p2wsh needs 32 bytes?

Why is it acceptable to use a 20 byte hash to represent single-sig witness programs whereas a 32 byte hash is used for pay to witness script hash?
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2answers
27 views

full node bitcoin, l have a 32 bit pc,can I run a node with an SSD?

full node bitcoin I have a 32-bit Windows 7 PC, can I run a node with an SSD?
1
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1answer
18 views

What happens if the commitment tx fee is too low?

How often are commitment tx fees negotiated? Is it every time a payment is made and a new commitment transaction is formed? What about if there are no payments but both nodes see that the on chain ...
0
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1answer
20 views

How is someone not able to steal my bitcoin with Dumpprivkey command?

In an online course the instructor told us that anyone can find the private key of a wallet by using dumpprivkey(address), address being the address that is created from the key (which is public in a ...
0
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3answers
43 views

Am I being scammed?

So this guy on instagram claims he's a bitcoin miner, and has a lot of money in his bitcoin wallet. He says he needs the username and password to my banking account to make deposits because he can't ...
0
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1answer
21 views

Where can one download the legit copy of bitcoin core software with hashes to verify?

Where can one download the office bitcoin core software? The bitcoin software that everyone is using. Just typing in "download bitcoin" in google, its quite confusing for newbies as you have bitcoin....
1
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1answer
21 views

blockstream API response

How do I determine if the current transaction is an outgoing or an incoming transaction from looking at the following API response? https://blockstream.info/api/address/...
0
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2answers
23 views

How to find your private key with your 12 Word Password Phrase and the depositing Address?

I use MyCelium v14 for iOS. In the past 72 hours, the address could not synchronize because the servers are "down, unpaid for". I have used my 12 Word to access MyCelium via Android App and Jaxx, ...
-2
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0answers
14 views

Free api service to monitor transactions on Bitcoin and other related cryptocurrencies? [closed]

I'm currently using block.io for fetching address and transaction data via its api's. I hit the free tier limit, but wanted to see if there is another service that is free that has a generous cap for ...
0
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1answer
28 views

When does a miner get the reward?

Let's suppose that a miner mines a block and adds it to the blockchain. When it gets the reward ? I suspect that first of all the other nodes have to verify that its proof of work is correct and it's ...
0
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2answers
14 views

How to get the capacity of remote channel in Eclair?

I want to query an Eclair node for properties of a channel which I'm not a party of. Obviously, this information is in the local view of the network graph and is used for routing. However, the API ...
0
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0answers
29 views

API blockchain possible single transaction for multiple XPUB ? HD Wallet

I want to create a deposit and withdrawal system (PHP) I use API blockchain.com My procedure When the customer requests an address to credit his account Create a new HD account (each customer has a ...
0
votes
1answer
30 views

Bitcoin Recovery

I purchased Bitcoins to make a purchase, I sent the bitcoin to my Electrum wallet and later started to make the purchase. When I checked the vendor their system timed out, but Transaction ID screen in ...
0
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0answers
21 views

How do I ask for witness data from a Bitcoin full node?

So, I'm trying to build a Bitcoin block explorer using my own Python library. I'm doing it just as an exercise to better understand how Bitcoin works under the hood. Right now, when I send a block ...
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0answers
16 views

equihash: How to correctly calculate the hashrate of the miner on the pool? [closed]

I have a pool where the node open mining portal is raised (https://github.com/s-nomp/s-nomp). Z11 miners are connected to this pool, which mine horizen using the equihash algorithm. There are ...
0
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2answers
36 views

bitcoin back-end blockchain storage

bitcoin uses blockchain so blockchain is peer to peer, every peer stores the data so I wonder where does the data of all the bitcoins is stored? who is peer in case of bitcoin? so that peer gets ...
0
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1answer
29 views

How is Bitcoin/Blockchain programmed to do multi transaction at the same time?

I read this article blockchaing stored and now I am bit confused. In this article it is described, that the transaction needs 15 seconds to propagate to the whole blockchain network. I know that the ...
0
votes
1answer
27 views

What is the algorithm that adjusts the difficulty of the proof of works in a proof of work based cryptocurrency? [duplicate]

For instance, Bitcoin has a proof of work based consensus algorithm, it's how Bitcoin chooses a node to create the next block in Bitcoin's blockchain. In this way the network is in consensus about the ...
0
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1answer
17 views

what are the dangers of transfering bitcoins between addresses?

So I heard stories about people losing bitcoins because their wallet didn't support a cerain feature.. or bitcoins getting sent to wrong address etc.. how does that happen? As a software developer I'...
1
vote
1answer
34 views

Wallet Recovery with Bip39 Seed

From having a list of bip39 seeds, is there any way of recovering a wallet? In particular, I have a list of ~100 seeds--one of which is mine--and need an automate way of figuring out which is valid ...
0
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3answers
29 views

Convert bech32 Bitcoin address to legacy

I know that similar tools exist for BCH (e.g. https://cashaddr.bitcoincash.org/). Is there a way to convert a native segwit bech32 Bitcoin address to a legacy format?
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0answers
17 views

How to set up a private Bitcoin network with low mining difficulty

I wish to set up a two-miner private bitcoin network. The miners need to compete for the hash power and the block generation interval is also set to be 10 mins. I found some tutorials about regtest ...
1
vote
1answer
28 views

Bitcoin core v0.19.0.1 automatically prunes?

Just finished syncing the whole blockchain after days and I realize the bitcoin settings were "pruning", which means I cannot use it as a wallet. is it the normal behavior of bitcoin core v0.19.0.1 ...
0
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0answers
27 views

I need someone who can help me acces my bitcoin address [closed]

Please I lost asses to my bitcoin private key and any white hat hacker to help me get it back
0
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0answers
9 views

Mycelium wallet won’t synchronize

In iOS app, Shows a balance before receiving BTC. The funds were successfully received at the generated address. Restored wallet with seed on electrum but shows zero balance. Don’t know what to do
2
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2answers
85 views

What meanings do the “NodeId”, “Version” and “Services” convey on Peers tab of Bitcoin-qt Debug window?

As shown in the picture, Is "NodeId" the ordered number (among all the existing bitcoin-core nodes) of the node that I am connected to? How does "Version" differ from the "User Agent" version (on ...
1
vote
2answers
28 views

BTC transfer duration

When BTC is mined, it is sent to the BTC wallet. The duration of the transaction can be up to 24h for online wallets. Is the duration faster, when transferring BTC to a “cold wallet”?
0
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1answer
31 views

Can we detect contentious soft forks created by the miners?

Can we analyze the blocks or the data sent per block in order to see if it includes new data that we do not recognize and assume that's a soft fork and invalidate such a block? Can a softforked mining ...
0
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1answer
16 views

Bitcoind is not synching, why?

My log was stuck on this for 30 minutes: 2019-12-09T22:33:17Z txindex is enabled at height 0 2019-12-09T22:33:17Z txindex thread exit 2019-12-09T22:33:17Z Bound to [::]:8333 2019-12-09T22:33:17Z ...
3
votes
1answer
42 views

Lightning Node High Availability/High Throughput

Are there any resources/best practises on running a highly available/high throughput lightning node? If my lightning service where to take off, should I be running multiple lightning nodes or a single ...
0
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0answers
16 views

21Million total BTC supply mined [duplicate]

What will happens to those miners of bitcoin? Do they still profit on mining?
4
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1answer
40 views

Discovering Bitcoin network topology

For a research I am doing I would love to have a graph with the network of reachable Bitcoin nodes. Active reachable nodes can be extracted by using getaddr messages (e.g. bitnodes project). However ...
0
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0answers
23 views

I can't access my freebitco.in account [closed]

I made a deposit in my bitcoin address in freebitco.in but when I tried to login I get this message " Incorrect login details" even though I'm sure I wrote the write email and password. Well I tried ...
0
votes
1answer
29 views

What if the blockchain saved space by trimming input txs on each transaction?

At each block there is a determined set of unspent transaction outputs. Each new transaction specifies the unspent outputs it's going to spend in the format tx_id:output_index. tx_id is 32 bytes. If ...
1
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3answers
42 views

What are some good solutions for analyzing Bitcoin script patterns?

I'm interested in analyzing the Bitcoin blockchain for occurrences of particular scripts and spending patterns. What are some good solutions for this? An ideal solution would let me filter ...
0
votes
1answer
14 views

Get scripthash for known scriptPubKey in PHP

I have to query addresses in ElectrumX server. How do I generate scripthash for a known scriptPubKey in PHP? Example address: array ( 'isvalid' => true, 'address' => '...

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