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Does Bitcoin Core write blockchain and chainstate data atomically?

In particular, when a new block arrives: Is the block written to disk in an atomic fashion, so a new block either exists, or it doesn't? (reader can never see a partially written state) Are the ...
user49396's user avatar
  • 245
0 votes
0 answers
50 views

How are NFTs stored in the bitcoin blockchain? [duplicate]

I'm new to bitcoin and am looking into how NFTs are stored into the blockchain. I saw somewhere that Taproot Script-Path Spend Scripts is where NFT data is stored but I'm not sure how. Can someone ...
mark's user avatar
  • 35
1 vote
0 answers
97 views

Bitcoin Core Unbuntu Custom Data Directory Does not Navigate to Secondary Internal Hard Drive

I have a laptop computer with 2 solid state internal 1000 GB hard drives. I have the operating system installed on drive 1 and I have the secondary drive formatted (ext4 file system), partitioned and ...
Valdy's user avatar
  • 11
0 votes
1 answer
5k views

Minimum disk space required for running a full node

As far as I know, for running a full node, we should have enough storage to store the whole block chain which is currently around 390 GB. But here at the official bitcoin.org the minimum hard-disk is ...
Amir reza Riahi's user avatar
0 votes
1 answer
846 views

Setting Up Multisig Correctly

I'm looking into setting up a multisig setup using Sparrow, and wanted to see if anyone can find any flaws in my set up, and potentially accessing my funds if I lose a key. set up = 2 of 3 Key store 1 ...
Paranoid BTC Novice's user avatar
0 votes
1 answer
44 views

Does an actual transaction happen on the blockchain when you buy btc/usdt?

I was wondering if I buy or sell something on the exchange if coins are actually transfered somewhere of if the exchange just changes values of what belongs to me.
itscoldoutsideman's user avatar
0 votes
1 answer
141 views

Are the block headers kept in memory?

Bitcoin Core keeps block data as files in the file system and blocks indexes in a LevelDB database to make the search process of transactions and blocks faster. But Bitcoin Core also stores block ...
MHT's user avatar
  • 13
1 vote
1 answer
99 views

How exactly are the undo files used when a re-org takes place?

It is obvious that the undo files (rev*.dat files) are stored to restore the blockchain to a previous version when a re-org takes place. What is not clear to me is what are the exact uses of the ...
FrozoWeb's user avatar
0 votes
3 answers
86 views

Long-term present in a form of cryptocurrency for newborn

Lets go... I am relatively new to to world of crypto. Have some experience with Binance, last few weeks. My friend had a son, and I want to give him a little different present - crypto investment in a ...
intni's user avatar
  • 1
0 votes
2 answers
64 views

How do I get my bitcoin from exchange and put it on the bitcoin network (blockchain)? and how do i do something similar with ethereum?

Currently my bitcoin is store in Exchange. I wonder if I should simply generate bitcoin address and private key in BitAddress and send to this address and safely store the keys that was generated. But ...
Heitor Giacomini's user avatar
0 votes
0 answers
34 views

Are all blocks stored in one file or is every block stored in an individual file? [duplicate]

I couldn't find an answer to that. So, are blocks stored in one or multiple files and in which file format?
user avatar
1 vote
4 answers
391 views

If the computer that stores the bitcoin is destroyed, how does someone access their bitcoin?

I have seen people say that you just need the private key and "some software" to recover your bitcoin. What does this actually mean in the real world? Can someone give an example? Also, if ...
Boone's user avatar
  • 11
1 vote
0 answers
90 views

Blockchain data indexing: key-value or relational database?

I'm building a hobby project with bitcoin-style data storage: I'm going to write block data into one large file. I need to decide how to represent the file in app's memory. Bitcoin uses key-value ...
aikrikunov95's user avatar
0 votes
1 answer
119 views

How does public address "know" private key?

Imagine the following: someone goes to the .org address of bitaddress, then switches off internet connection, then moves the mouse around until eventually the JavaScript Client-Side Bitcoin Wallet ...
SammyJunior's user avatar
0 votes
1 answer
413 views

Doesn't storing the "recovery seed phrase" for a wallet defy all logic?

I've heard many times that you are supposed to write down a "recovery seed phrase" (a series of English dictionary words) on a piece of paper and store that securely so that you can recover ...
M. Bartol's user avatar
1 vote
1 answer
2k views

what is the size of information contained in one bitcoin?

Every information stored digitally requires some space. For example : a text file (2-3 Kilobytes) a song (7-8 megabytes depending upon bit rate) a phone picture (5-6 megabytes) \and so on.......... 1 ...
praneetjain's user avatar
0 votes
1 answer
136 views

Where is the actual data stored in blockchain?

I know that the blockchain stores the transnational data and it is immutable but where is the actual data stored? If there is a use case to replace a centralized data center solution with a blockchain ...
lokesharo's user avatar
  • 101
2 votes
1 answer
223 views

How can I download a single Bitcoin block?

I just started studying bitcoin. I would like to be able to download a single block from the Bitcoin network. I referred to the following: https://blockchain.info/rawblock/...
seonguk park's user avatar
3 votes
1 answer
988 views

What is the current size of txindex folder when txindex=1 set? [duplicate]

Due to reputation limitations, I cannot ask for an update on this question: How much extra disk space does txindex=1 require? What is the current size of the txindex folder when txindex=1 is set in ...
Johannes Rottenkolber's user avatar
2 votes
1 answer
78 views

How exactly are public/private keys stored?

So Bitcoin uses an HD wallet and thanks to that it can store keys in a hierarchy. But how exactly and in what format are they stored? Is each private and public key stored as a separate file? Are they ...
Aschente's user avatar
1 vote
1 answer
91 views

A Bitcoin soft fork idea to help compress the blockchain

I've thought about a soft fork that can help storage costs. Why don't we force miners to embed the height of the TX Merkle tree in the first two bytes of the 4-byte block header version? It would ...
MCCCS's user avatar
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0 votes
0 answers
99 views

How can I seamlessly extend disk for bitcoin-core full node?

I'm running a bitcoin-core full node and serve customers wallet service (e.g. creating a wallet, sending tx). I set the chain data disk size to 400GB when first setting the node up and the disk is ...
gocyrp's user avatar
  • 1
0 votes
1 answer
112 views

Bitcoin Core full node has saved a lot more space than 260gb

I've had Bitcoin Core running on my Macbook i5, 8gb ram, the last five nights and have gotten to 58%. It's downloading to an external hdd and now the blocks directory contains 375gb of data. Another ...
Karlos's user avatar
  • 1
0 votes
1 answer
526 views

If I send a BTC to an offline cold storage, does the transaction in the blockchain appear when i send it or when i receive it or not at all?

If I send a BTC from my hot or exchange wallet to my cold storage does it has to pass the blockchain or can the blockchain be bypassed? If it has to pass the blockchain, when does it appear in the ...
Juerg Duerig's user avatar
1 vote
1 answer
556 views

do i get a new private key for every transaction that I transfer to my cold storage

If I buy crypto in little bits at a time and I transfer to the cold storage wallet every time I buy some, would a get different private keys for each transfer? how to keep track of all those keys? ...
ERosen's user avatar
  • 11
1 vote
1 answer
52 views

Is it possible to store data privately into the bitcoin blockchain?

Given that Bitcoin is a public and permissionless blockchain, does this mean that any data stored in it will be free for anyone to see? Is it possible to store documents such as screenshots etc.?
AdaptiveAnalysis's user avatar
0 votes
4 answers
2k views

Where is the data stored in Bitcoin?

Is all the data related with the transaction of bitcoin stored in blockchain or the data stored somewhere in the cloud and they are referenced from blockchain. I have this confusion because if we are ...
arctic_Oak's user avatar
1 vote
2 answers
42 views

How much can you compress a bitcoin for storage?

I've just implanted an NFC chip in my hand and I'm wondering if a bitcoin will fit in the chip. it has a capacity of 868 bytes.
Oscar's user avatar
  • 11
3 votes
2 answers
2k views

How to store private key in MySQL database?

I want to receive payments from Bitcoin on my web app, but I do not want to use corporate gateways (coinpayments, bitpay, etc), I'm wanting to make my own gateway. I do not know how best to do this ...
Vinicius Aquino's user avatar
1 vote
1 answer
130 views

How to move sync's data to another partition after run Bitcoind for a while?

I have download a new bitcoin package from official site. And then I ran it with daemon mode also with default configuration (Default means not bitcoin.conf file was created in ~/.bitcoin/.bitcoin....
Frank AK's user avatar
  • 151
1 vote
1 answer
235 views

Why is the target truncated?

Reading the docs on target: The maximum target used by SHA256 mining devices is: 0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF Because Bitcoin stores the target as a ...
Paul Razvan Berg's user avatar
0 votes
1 answer
76 views

Share private data and prevent data forwarding

Let's say A has some private medical records of patients and B is a pharmaceutical company who wants to view medical records from A to find out the effect of a particular drug on the patients (run a ...
Rajrup Ghosh's user avatar
0 votes
3 answers
2k views

Can Bitcoin be stored in a computer without a wallet , just like a normal file?

Everything on computers are stored in some type of files like .txt , .MP3 , ... Etc , so is it possible that BTC itself could be stored in a PC independently without a wallet , just like any other ...
Aashish Loknath Panigrahi's user avatar
0 votes
1 answer
827 views

Bitcoin blockchain in mongodb

How bad would it be to use MongoDB as a Bitcoin database instead of LevelDB? I know that LevelDB is faster but I've also read that MongoDB is better for doing queries. It seems cleaner to store the ...
Vladislav Zhdanov's user avatar
2 votes
1 answer
2k views

does 24-word recovery seed recover just bitcoins or all coins?

I keep Bitcoins, Bitcoin Cash, Bitcoin Gold, Ethereum (via My Ethereum Wallet) and Litecoins on a Trezor. Question 1: In the event that my Trezor is lost or destroyed, will my 24 word recovery ...
www's user avatar
  • 25
2 votes
0 answers
460 views

What is the smallest ubuntu virtualbox image to run cryptocurrency software on?

I'm looking to do all my crypto related stuff like storing coins and managing my coin wallets inside a virtualbox. I plan to use ubuntu as it seems most friendly with many crypto coins. What is the ...
Patoshi パトシ's user avatar
2 votes
2 answers
436 views

Another 140 GB for BCH?

My question is should I allocate another ~140 GB of disk space for BCH full node? Thanks!
Stamper's user avatar
  • 23
0 votes
1 answer
189 views

could trezor be used to store passwords like 1 pass? [closed]

I'm wondering if trezor be used to store password(s) like you do with 1pass? If not, is it something you'd contemplate in developing? Thank you
San Takashima's user avatar
1 vote
1 answer
532 views

In a private blockchain network, can we delete the first N blocks and reassign the N+1th block as the genesis block?

I am aware of the data loss caused by deleting the first N blocks. But I am curious to know whether such a task is possible or not. If so, how to practically implement it?
spharish's user avatar
  • 111
1 vote
1 answer
345 views

Privacy issues with storing entire information in blockchain

I have been learning about how blockchain can be implemented in IoT, or health where entire information of patient is stored in blockchain, or in case of governments having info about citizens. ...
trollster's user avatar
  • 260
5 votes
4 answers
2k views

Keeping old blocks on an external hard drive and latest blocks on an SSD

I would like to keep the latest 512 MB of blocks on my SSD (using pruning?) and the rest of the blockchain on an external non-SSD hard-drive. Is there a way to do this already, or do I need to write a ...
Geremia's user avatar
  • 4,640
3 votes
1 answer
419 views

Is Blockchain safe to store personal information? [closed]

I do my first steps in blockchain development and I have a questions about storing some sensitive data on a chain. Assuming two companies developed the protocol of document exchange through Blockchain....
Ilya Loskutov's user avatar
4 votes
2 answers
3k views

Why doesn't each node store only a portion of the blockchain?

Why doesn't each node only store a portion of the blokchain instead of the entire blockchain? Is it possible and why is it possible or impossible?
ethereum_noob's user avatar
2 votes
1 answer
95 views

Do I spare 80Gb to only keep the blockchain and do I need it to be always present?

I am new to Bitcoin, reading a book and just downloaded a client. On site I read the note that I would need about 65-80gb to keep the whole history of transactions. What happens when it downloads the ...
Sergei Basharov's user avatar
7 votes
2 answers
20k views

Why does Bitcoin Core take up so much space?

I have downloaded Bitcoin Core and the blockchain has nearly filled my local storage. Can i move the wallet to a hard drive and then delete Core from my computer? I'm a newbie lol
M Mcgowan's user avatar
2 votes
3 answers
629 views

How to store transactional information on the blockchain

I have an operational process that involves several sub processes. I am currently maintaining an audit trail of the entire process. For (successfully) completed processes, I want to record the ...
Homunculus Reticulli's user avatar
2 votes
3 answers
158 views

Is there any bitcoin fork which goal is storing arbitrary information?

I know that there is Namecoin, which saves key:value pair. Is thete other similar solutions? Maybe for arbitrary textblocks? Update: how they do it? Delaware Blockchain Initiative to Streamline ...
Sklavit's user avatar
  • 121
3 votes
0 answers
149 views

Does anyone know how to enable "Massively Reduced Disk Usage for Wallets" feature in Bitcoin Core 0.12.0? [duplicate]

Based on the release note https://bitcoincore.org/en/2016/02/23/release-0.12.0/. Users will be able to run a full node while only storing around 2GB of data. What should I do to enable this feature ...
Frank Wong's user avatar
1 vote
1 answer
386 views

How long do files stay on the Decentralized Data Storage blockchain when using NXT's Data Cloud Feature?

NXT 1.7.4 just released a new Data Cloud feature: How long do files last on the NXT blockchain?
Patoshi パトシ's user avatar
2 votes
2 answers
275 views

How should one manage the Bitcoin blockchain on a Linux laptop with limited storage?

I want to run Bitcoin-Qt on a laptop that has limited storage (it has an SSD and is used for many purposes that all require a bit of hard drive space). Assuming these hardware limitations, what would ...
d3pd's user avatar
  • 123