Questions tagged [cryptography]

Concerning the broad subject of cryptography and its narrow application in Bitcoin protocol and applications.

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37 views

Any Crypto crowd-funding Website? [closed]

Iam about to launch first Crypto Currency Exchange in My Country, Mozambique (Africa)- where people can buy and sell crypto, any recomendation about Crypto crowfunding Website where I can rise small ...
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10 views

Bitcoinj Doesn't increase wallet value

this is the initialization of wallet and block and PeerGroup : Wallet wallet = new Wallet(params, KeyChainGroup.createBasic(params)); BlockChain chain = new BlockChain(params, wallet, new ...
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1answer
230 views

Some technical questions about Bitcoin [closed]

I'm a developer. I've read a lot about Bitcoin structure and how it works. But yet something confuse me. I would like to share them with you and read your answers: When a miner solves a block, how ...
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1answer
71 views

Canceling my pending withdrawal BTC

How can i cancel my pending withdrawal BTC of $1,240. Its been pending for 2 days. it has no confirmations and on the blockchain it says it receives 0 and sent 0. Someone PLEASE help me!
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1answer
59 views

Explanation of “Timestamp Server” section in original bitcoin paper

I'm trying to understand the "Timestamp Server" section in the original bitcoin paper. It feels overly short for someone without an understanding of cryptography. Is it saying? A block ...
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0answers
27 views

Get/Calculate Address

I'm currently using a program that analyses the block files. It splits all the stuff into multiple .csv files. Is there any method I can do to get the addresses & amount sent/received from tx_in ...
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16 views

Why exchanges show Bitcoin price higher than actual value? [duplicate]

I trade crypto on indian platform WazirX and CoinSwitch. Both are currently showing price of 1 Bitcoin to be 44,78,353 Indian Rupees ($ 60,605.51) while the price shown on google as well as Binance ...
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1answer
40 views

Shared crypto hardware wallet

We were all newbs at the beginning, and did things the wrong way. My partner and I bought crypto separately with our own exchange accounts, but transferred our hodl coins to a single shared hardward ...
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2answers
66 views

How Bitcoin restricts the mining time?

How Bitcoin restricts the mining time? We know cryptocurrency systems restrict the mining time of a block to a certain limit for security reasons. For example, mining time for Bitcoin is ~10 minutes. ...
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32 views

Using key aggregation (multsig) in P2TR script path spends

I know that it is possible to create a 2-2 multsig using Taproot by combining both private keys into one public key and defining that as the key path spend. I also know that it is possible to use ...
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28 views

basics of cryptocurrency [duplicate]

I recently became interested in cryptocurrency and its mining process but there are a few things I don't understand very well and I am still trying to learn the basics more before getting into trading ...
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1answer
24 views

How is wallet balance from unspent transactions in cryptography terms?

There is already a good almost complete answer here (but missing the cryptography explanation): How is a wallet's balance computed? Is a bitcoin wallets balance calculated on the client computer ...
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1answer
58 views

Create wallets on website PHP

I am trying to create a website that allows the deposit of cryptocurrencies (BTC / ETH / LTC) in the account, consequently I need to create a wallet at the personal registration for each of these 3 ...
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Looking for Bitcoin/Crypto payment processor that will split payments (pay multiple people from sale)

I'm looking for a crypto payment gateway that will allow me to accept payment for a product. It should support splitting the payment between multiple crypto wallets (multiple people).
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1answer
57 views

Public key Exceeding Mod P? A Clarification Request On The Discrete Logarithm Problem

I tried to observe / implement the discrete logarithm problem but I noticed something about it; but before I get into it let me give some clarification which is open to correction. a = b^x mod P ...
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1answer
29 views

Feasibility of using Ring Signatures with CoinJoin Technique

There is a Ring Signature implementation in C++ by Libbitcoin team. We can find the details in the following GitHub repository. Is it feasible to use Monero like Ring Signatures together with the ...
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1answer
39 views

Multi Party ECDSA?

Are there any alternatives to the Multi Part ECDSA implementation contributed by ZenGo?
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49 views

Any Bitcoins on an old computer

I purchased an older computer at a garage sale, the seller said her son used it from about 2008 to 2012 to play games online. It still has the original hard drive and the seller says its been in ...
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2answers
59 views

How can I determine where a BTC transfer from one of my accounts to another went wrong?

I have two BTC accounts on a Ledger S Nano hardware wallet, which I can check via the Ledger Live software. I've transferred BTC many times already, to my own accounts and to other people, and never ...
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1answer
153 views

BTC Treasure hunt

Alright, I’m new to Bitcoin/Crypto, and this might be a long story but worth it. My life long friend had a $50 Visa gift card back in 2009-2011. His friends were over the house one day and mentioned ...
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15 views

Difference between cryptography in cryptocurrency hardware wallet and 2FA hardware security key

What's the general overview of difference between the way how cryptocurrency hardware wallet works and how hardware security key (used for 2FA) works?
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1answer
89 views

Why is Public Key aggregation in MuSig described as a product of the public keys?

In the the MuSig2 paper, it is described that: Each signer randomly generates and communicates to others a nonce Ri=g^ri; then, each of them computes R=∏ni=1Ri,c=H( ̃X,R,m)where ̃X=∏ni=1Xiis the ...
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2answers
49 views

Finding the current statements about bitcoin [closed]

Which of the following statements about blockchain are correct? A) A transaction is accepted once it is included in some block. B) A transaction is accepted once it is included in a block that is at ...
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29 views

Can I recover a 12 word passphrase if I only have 11 words [duplicate]

I have crypto wallet with a 12 word passphrase. I have written down the words incorrectly and omitted a word. Are there methods of recovering the 12th word. I have access to the wallet account but ...
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63 views

SHA256 speedup possible if executed on GPU

Is it possible to speed up hashing if hashing is done on a GPU? Does that even make sense or are the CPU instructions faster because for normal signature verification you don't gain by parallelizing ...
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2answers
118 views

How to change the field of the elliptic curve to the new value N while keeping the default Secp256k1 parameters?

I want to change the margin of the elliptic curve to the new N value, while doing so I want to keep the parameters Standard G-point Generator Secp256k1 that is, I want to replace: N = ...
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2answers
82 views

Import 256 bit private key

Can I import a 256 bit private key in a Wallet (binary format)? Or do I have to convert it in another format?
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1answer
33 views

Crypto Account hacked

12 words password has been hacked and lost all the money in crpto account. Anyways to recover the money ? Please please help!
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2answers
40 views

Bitcoin users limit

How bitcoin handle users limit if only 4000 transactions in every 10 minutes ? Let's say I transfer 2 bitcoin to Anuj account then how much time maximum it will take to reflect in Anuj's account and ...
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Is that proved that breaking ECDSA as hard as solving ECDLP?

Is that proved that breaking ECDSA (Elliptic Curve Digital Signature Algorithm) as hard as solving ECDLP(Elliptic Curve Discrete Logarithm Problem)?
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20 views

How do bitcoin verifies block hash after new hash have been submitted by Miners? [duplicate]

I want to know how at the end of Bitcoin server block hashes are verified after it has been submitted by a miner. Do they already have a previously calculated block hash DB or something else? I m new ...
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1answer
77 views

Bitcoin's cryptographic protocol allows for leakage of information about one's Private Key, making recalculation of the private key possible?

Is it true that the cryptography which is used in bitcoin allows for leakage of information which could be used to recalculate the private key - IF you are continuously reusing the same public address ...
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132 views

How are the prefixes for EXT_PUBLIC_KEY and EXT_PRIVATE_KEY derived?

I want to know how the prefixes for EXT_PUBLIC_KEY and EXT_PRIVATE_KEY are derived. For example in bitcoin you have: base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,0); ...
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44 views

What would a bitcoin quantum resistant address look like? [duplicate]

In an hypothetical future where a quantum computer is able to break the cryptography protecting the bitcoin private key, one of the solution would be to move our coins to quantum safe resistant ...
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1answer
191 views

Using xpub key derivation for user account balance?

I want to accept payments, and to keep the wallet secure I believe using a xpub key would be the correct solution. The site uses Google Login, which gives me a user id. My idea is that given the ...
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1answer
163 views

Elliptic Curve Point at Infinity

Let's take into account the Bitcoin curve. My questions are: What exactly is the "point at infinity"? Is there more than one "point at infinity" How can I identify if my EC generated x and y are the "...
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1answer
52 views

Could a computer virus made less than a mb, which is sent as transaction that attacks miners? [closed]

What happens if computer virus less than a mb is sent as transaction that attacks miners?
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1answer
141 views

Positive or negative private key of a bitcoin wallet?

Private key is a number. Is the question positive or negative? Is it possible to know a positive private key or negative if you only know the public key? For instance: Positive private key: 2 ...
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0answers
38 views

security of the mining algorithms litecoin vs bitcoin - scrypt vs sha256?

how is the cryptanalysis' current state on both sha256 and litecoin's scrypt? is litecoin's scrypt on a security level like sha256? by security i simply mean ways to "break"/"de-cipher" the hash ...
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1answer
182 views

How many bits of entropy is a Bitcoin address?

I've seen references to 160 bits of entropy, but I'm not sure if this is universal or just applies to the old address format.
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2answers
105 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”?
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3answers
547 views

Are BTC Private Keys evenly distributed in 256bit space?

If we assume that there are ~2^96 private keys for EACH bitcoin address (2^256-160) and we assume that in cryptography it is considered good property of every hash function if it evenly distributes ...
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2answers
163 views

I need to know about wallets in cryptocurrency, how do exchanges generate deposite address per user?

In exchanges like Binance when a user wants to deposit coins in bitcoin or in other coins, per user receives a unique public key? Do they have to generate pair key private/public key for each user in ...
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1answer
21 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 ...
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1answer
65 views

Can ECDH peers waste each other's time at will?

Peter Dettman notes that ECDH peers can waste each other's time at will. What does he mean? Can this be weaponized against Lightning nodes?
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120 views

Is there any blockchain explorer available to track the trades of cryptocurrency exchange?

I haven't seen any decentralized exchange that provides the information of trades and can track the record of transaction history and time. I am looking forward to that exchange which can provide ...
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1answer
44 views

Is IQmining worth the investment? [closed]

I am interested in investing in crypto-contracts, is IQmining worth the investment?
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1answer
51 views

Consider using Bitcoin but just heard the IRS is sending tax notices to 10k plus users

article: https://www.cnn.com/2019/07/26/tech/irs-cryptocurrency-taxes/index.html My background: Good understanding of RSA cryptography, some elliptic curve, Number Theory and I am a (real)programmer ...
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1answer
39 views

How public-key cryptography secures bitcoin transactions from 51% attacks and Mining Attacks

I wanted to better understand how public-key cryptography avoids 51% attacks and mining attacks, also if this question is wrong please correct so that i can improve my research and provide me with ...
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What role does public-key cryptography play in bitcoin transaction? [duplicate]

Explain in one word and kindly tell what is it exactly that public-key cryptography does in bitcoin.

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