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Questions tagged [security]

This tag should be used for questions regarding security issues with the design or implementation of Bitcoin and related cryptocurrencies.

0
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2answers
152 views

How to secure new public proof of work blockchain?

I am fairly new to the bitcoin and blockchain technology and have recently started reading about it. So my understanding and the question bellow may not be very accurate. As I have understood so far, ...
1
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1answer
358 views

How many peers do you need to securely synchronize with the blockchain?

What is the minimum number of peers required to securely synchronize my local blockchain copy?
2
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0answers
134 views

How can I create an exchange in a foreign country? [closed]

New to stack exchange this is my first post so sorry if its rough. I'm part of a project interested in bringing BTC and crypto trading to Angola. We aren't sure where to start or what the best route ...
2
votes
1answer
110 views

Are the mining incentives of bitcoin compatible with the existence of a competing Proof-of-Work chain? [closed]

Scenario A: A chain split occurs due to a bug or contentious rule change (i.e. the miner incentives aren't changed in any way). Both coins initially start out with the same difficulty (and won't ...
1
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1answer
612 views

How does the transaction signature prevent transaction duplication?

Let's say that Alice sends 1 BTC to Bob. We have then a signature of (Alice sends 1 BTC to Bob) with Alice private key. What prevents Bob from duplicating this exact same transaction and sending it to ...
-1
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1answer
40 views

What arguments would one pose to shows Bitcoin is an enabler of crime and not an enabler of crime?

What arguments could be made for Bitcoin being an enabler of criminal activity? For example: Could Bitcoin be used as the backbone of Ponzi Schemes? Are there any consequences for Bitcoin miners who ...
1
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1answer
71 views

What if the bitcoin blockchain grows to the point it cannot be decentralized anymore?

I read the bitcoin white paper and am in the process of readin ethereum's. The second paper reads at one point : "Currently, this is viable for some desktop computers and not phones, and later on in ...
2
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2answers
878 views

Is it possible to use the same BIP39 list of seed words to create addresses for different crypto assets?

Currently, as a matter of convenience, I'm holding small about of crypto assets on various exchanges. It's not ideal - I'd much rather store them locally, have access to the private keys, be in full ...
2
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2answers
76 views

How is the human end of the Bitcoin network secured?

Being devil's advocate right now. If you have a very strong cryptography, however, secure system's Point of Failure is always the human end. We spend hours trying to make Bitcoin secure at core level,...
0
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1answer
88 views

Will the amount of “usable” Bitcoins eventually drop to zero? [duplicate]

Let's assume that there is a non-zero probability that people lose their bitcoins, e.g. by forgetting their password. The amount of bitcoins these people possess will become "unusable" but still ...
0
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1answer
322 views

Bitcoin's disappeared from unused wallet

wondering if I could get some help from you experts on something that has been bugging me for a bit. I found an old bitcoin wallet I had forgotten about. You can see its information here. I was ...
0
votes
1answer
668 views

how can I resolve an unconfirmed deposit to my blockchain.info wallet? [duplicate]

After 35 hours and still Unconfirmed bitcoin deposit to my blockchain.info wallet after I sweeped the bitcoins I have in my paperwallet which I created on bitaddress.org. Hello everyone, this is my ...
0
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1answer
318 views

What concerns arise from the heavy miner concentration in China? [duplicate]

As per an Business Insider article last year, approximately 73% of the hash power comes from China. Over 50% just by the top 3. If coordinated, they could cause havoc. Is that a concern to anyone?
2
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1answer
313 views

How security is managed in Cryptocurrencies with no mining possibility

I know pretty well how the bitcoin and ethereum blockchain works respectively, but I'm seeing a lot of new cryptocurrencies with no mining system. As far I'm aware the blockchain needs miners to give ...
1
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0answers
556 views

Is the following a valid bitcoin private key? - FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE

In secp256k1 (Bitcoin's elliptic curve) it is defined that valid private keys may range from 1 to FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE BAAEDCE6 AF48A03B BFD25E8C D0364141 - 1. (https://crypto....
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0answers
125 views

If Incentive is a Cornerstone of Bitcoin, how is blockchain useful in enterprise

The Bitcoin Paper talks about how an attacker with more CPU power than what honest nodes control might be ablet to change transactions and double spend their coins. But because each block awards a ...
1
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2answers
98 views

Would an optimization proof-of-work problem where the entity with the lowest hash wins have any security weakness or other disadvantage?

I am wondering if there would be any security deficiencies if cryptocurrencies such as Bitcoin were to change their proof-of-work problems to optimization contests. For example, suppose Bitcoin were ...
1
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2answers
1k views

How proof-of-work detects Sybil attack in Bitcoin?

I read in several paper that PoW deters Sybil attack in Bitcoin. However, there is no enough explanation about how proof-of-work detects Sybil attack in Bitcoin?
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0answers
85 views

Is the reference client of Bitcoin regularly audited?

I imagine that plenty of eyes have combed through the reference client's source code. But the code is still changing for a variety of reasons (features, patches, improvements, etc). I didn't find ...
1
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0answers
225 views

How prevent from hacking personal computer and using my jaxx account

It looks like anyone who can hack a computer has direct access to the jaxx wallet stored on the hard drive. Is there any way to block access like requiring a strong password to open the wallet? ...
0
votes
1answer
197 views

Can my bitcoins get stolen? [closed]

I posted a question on here about my bitcoins being stuck, they are no longer stuck but someone has taken all of my bitcoins from that wallet and I don't know how
4
votes
2answers
162 views

Can everybody earn bitcoin? [closed]

I am a Bangladeshi. I know little about bitcoin and I have no credit card. Is it essential having bank account to earn bitcoin? How will bitcoin help me? How and where can I start earning bitcoin?
3
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3answers
2k views

Can rainbow tables be used to find private keys from public keys?

I understand that the public key is kept hidden until a bitcoin transaction is made, at which point the public key has to be revealed to prove that you created the transaction with your private key. ...
8
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3answers
46k views

Is it safe to store all my coins on Coinbase?

Is it safe to store my coins (BTC & ETH) on the Coinbase platform or is it safer to download a wallet to keep them in?
0
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2answers
219 views

Address reuse, one address per person

I know about the privacy and security implications of address reuse. But I was thinking about a scenario where I have one address for every person I receive transactions from. This would still have ...
0
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1answer
448 views

What are the advantages of running a full node in comparison with a lightweight client?

I read that running a full node provides "more security" than running a SPV client. What does this concretely mean? I think I understand pretty well how those two kinds of nodes work but I do not see ...
3
votes
3answers
156 views

Securely encrypting a cold storage wallet

I'm going to buy bitcoin to exchange BRL to CAD currency, as it's gonna be a great amount I'm concerned about the security of my wallet. I don't want to use a physical backup like paper or device ...
1
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0answers
87 views

Is the Password stored in RAM in clear text after decrypting the MultiBit HD wallet?

After decrypting your wallet in MultiBit HD, is the clear text version of password stored in the RAM?
1
vote
1answer
444 views

Is there a way to detect a mining cartel?

According to blockchain.info, the largest mining pool holds less than 20% of the mining power, which is far below the dreaded 51%. But, this information is (probably) based on the pools publicly ...
1
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0answers
1k views

How can bitcoins be stolen?

I read about Mt. Gox and how 850,000 bitcoins has been "stolen" from it. I do not understand how someone can steal bitcoins: if MtGox has bitcoins, and MrThief wants to use this bitcoins, then MrThief ...
2
votes
1answer
51 views

Why is it important that miners mine at the end of the longest branch?

In this paper, the authors present a simplified description of mining strategies. The strategy which they call "honest strategy" is to always mine a block at the end of the currently longest branch. ...
1
vote
1answer
156 views

Does pruning affect a node's security or consensus ability?

An SPV node certainly is a compromise of security because the full set of consensus rules are not verified by the node (for example block size or subsidy rules). A pruned node seems like a win-win, ...
1
vote
0answers
201 views

Privacy risks with a hardware wallet

I'm trying to understand the privacy risks with a hardware wallet like a Trezor, Ledger, or similar. I understand the common workflow with these wallets is that you use an SPV bitcoin client which ...
3
votes
1answer
443 views

Is it feasible to derive the root key of an HD wallet from a large sample of child public keys?

I'm considering the following architecture for a bitcoin-related service: A BIP 32 HD wallet is created that controls all of the account keys for the web service. The private key is kept in cold ...
0
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2answers
49 views

What would stop this kind of attack?

Many gambling services (and p2p exchanges) do not wait for confirmations before exchanging value (many realize their customers will not wait 6+ hours for a confirmation). What's to stop someone from ...
1
vote
1answer
631 views

What makes HD wallets resistant to brute force attacks?

To be more specific, let's consider wallets that use 12 words as a seed. Total bit width is 132, with 4 bits used as a checksum, so the actual seed size is 128 bits. I know 2^128 allows for LOTS of ...
5
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3answers
1k views

How to make PoS system work?

In a r/bitcoin I've found the following statement: I think it should be noted that this paper covers a "pure" PoS system, but there have been some hacks to PoS systems to make them "work" (work ...
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2answers
4k views

What is the most secure operating system that I can use to store bitcoins without having to fear a hacker stealing them?

What is the most secure operating system that I can use to store bitcoins without having to fear a hacker stealing them?
1
vote
1answer
42 views

How can a light client be certain he got all relevant transactions?

With merkle trees, a light client can be sure some transactions he receives are correct with a minimal amount of the blockchain data. How can such a client, though, be sure he received all the ...
3
votes
1answer
220 views

What if a pair of double-spent transactions are collected into a new block?

Let's say, Alice sent a bitcoin to Bob, and then immediately sent the same coin to another address controlled by her. A honest node collected these two transactions into a new block. Would the node ...
1
vote
4answers
444 views

Is there any blockchains that has implemented a 2fa type of security measure?

Currently someone can steal your btc private key and send all your funds away. But has there been a 2fa built into a blockchain that prevents something like this? Say if you wanted to send something ...
0
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1answer
25 views

Payment Channels - Securing the private key that locks client funds

Do I need to secure an automatic generated private key used for locking an anchor transaction (the one that opens the channel, locking the client funds), since it only serves that locking purpose (not ...
0
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2answers
196 views

Why Bitcoin does not user bcrypt for hashing?

I've read that bcrypt is a hashing library that can adapt to Moore's Law and I thought that would be great for the network to adapt in a flexible manner its security to its respective growing ...
0
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2answers
530 views

Spying on a bitcoin user after knowing all of their addresses

I'm new to Bitcoin and trying to figure out some question about it and blockchain technology. My question is simple: Is it possible to spy on a person, if the attacker (criminal, government) somehow ...
5
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0answers
105 views

Zcash proposal to use checkpoints to verify monetary supply [closed]

Based on concerns about the trusted setup not being able to conclusively disprove the ability to create hidden inflation, Zooko recently described an idea to institute checkpoints to verify the total ...
6
votes
2answers
161 views

Will Bitcoin scaling affect the amount of hashing power required to keep the network secure?

In Mastering Bitcoin Andreas Antonopulous asserts that "Bitcoin can scale up, achieve broader adoption, and remain secure without any increase in hashing power from today’s level." Is this really ...
0
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0answers
288 views

Norton Firewall Mining

I am trying to mine behind a Norton firewall. I can connect when I deactivate my application and connection security on my firewall completely. I have tried to allow the connection for port 8883 and ...
6
votes
2answers
210 views

Can a blockchain from the future be synchronized today?

If one or a few computers with blockchains from a future time line were connected to the Internet today, what would happen? This other question in Worldbuilding focus on possible consequences, but ...
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1answer
136 views

What cryptography hardware and/or software does a bitcoin exchange need to employ?

We have an operating equities exchange. To exchange bitcoin or other crypto-currencies, what cryptographic hardware or software would we have to use?
1
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1answer
188 views

Can i trace a hacker by collecting data from Bitcoin api?

In Japan, MtGox, the biggest bitcoin exchange went down and went bankrupt due to hackers. So I'm working on a project in my College to enhance security of bitcoin transactions using the data mining ...