12 votes

Is there a way to set up proof-of-work systems so they would be even more useful?

Assume for a second that we found a proof of work algorithm that had all of the good properties of sha256, but was also useful for SETI and maintaining world peace. Now suppose a group of miners ...
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  • 431
9 votes

What are the differences (and value adds) among all the different Crypto Currencies?

99% of altcoins claim an "innovation" that is broken or unproven. I would say that the first thing to do is look at unique codebases that aren't based on Bitcoin, which basically means (besides ...
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8 votes
Accepted

Why can't timestamps be a substitute for blockchain?

But then the next problem is transaction order and validity to prevent double spending. I don't understand completely why a timestamp can't just be included for every broadcasted transaction, and the ...
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7 votes
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What is the most lightweight proof-of-work algorithm?

Contrary to the name the proof of work used in Litecoin is significantly more difficult than SHA256 to verify (it slows sync times noticeably), while simultaneously not achieving it's goals of being ...
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  • 15k
7 votes

What are the differences (and value adds) among all the different Crypto Currencies?

A very large majority of these altcoins are essentially scams. There is a cottage industry that takes a coin, changes something minor (name, logo), and releases it with great fanfare, enticing people ...
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  • 786
5 votes
Accepted

Why is a short blocktime considered to be unsafe?

The shorter the blocktime the more time is lost by the relaying of blocks in relation to the average blocktime. A very short block interval therefore makes SPV mining (i.e. mining empty blocks without ...
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  • 63.6k
5 votes
Accepted

NXT, Ignis, and Ardor Confusion. Purpose of NXT when there is Ignis / Ardor?

If NXT is switching to Ardor, what is the purpose of holding NXT? Nxt isn't switching to Ardor. It will still exist after Ardor launches. The purpose of holding NXT with this in mind is if you need ...
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  • 281
5 votes

How scalable is a Blockchain-based system?

Blockchains are not really scalable. For the most security, blockchains need to be replicated on as many devices as possible. Those devices are full nodes and must download and verify every single ...
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  • 61.5k
5 votes

Why can't timestamps be a substitute for blockchain?

But then the next problem is transaction order and validity to prevent double spending. I don't understand completely why a timestamp can't just be included for every broadcasted transaction, and the ...
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  • 61.5k
4 votes

How to determine what type of coins a wallet.dat contains?

Here's one way I found. Get pywallet (https://github.com/jackjack-jj/pywallet) and run python pywallet.py --dumpwallet --wallet=/foo/bar/wallet.dat Look in the output for a field called names. ...
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4 votes

Is there an opensource crypto-currency exchanges engine?

Bitsquare.io is currently the state of the art and it is open source: https://github.com/bitsquare/bitsquare/
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  • 381
4 votes

Is there an opensource crypto-currency exchanges engine?

Peatio is an open source crypto exchange. Their README says: Peatio is a free and open-source crypto currency exchange implementation with the Rails framework and other cutting-edge technology. ...
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4 votes
Accepted

Does it make sense to design a mutable blockchain?

I agree more context is needed to provide a more directly meaningful answer. But in general: a blockchain allows users to interact without trusting a central authority, instead they verify the ...
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  • 17.3k
3 votes

Which cryptocurrency has the smallest block time?

EOS has blocks that are published every ~500ms, so around two blocks per second. That's a contender for the top spot for sure
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  • 31
3 votes
Accepted

Which cryptocurrency has the smallest block time?

There was a coin called Flashcoin that tried to do 6-second block times. I don't think that's being actively mined anymore as another Flashcoin appeared a year later (60-second block times). Ethereum ...
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  • 7,639
3 votes
Accepted

Where can new cryptocurrency features be found?

Have a look at the hardfork wishlist for Bitcoin. These are changes that are just to hard too do in Bitcoin as they would require major changes to existing infrastructure, but are generally considered ...
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3 votes
Accepted

How can people in Indonesia use Bitcoins?

You can try https://www.bitcoin.co.id/ and use IDR. Or you can find seller / buyer in https://localbitcoins.com/places/570925/jakarta-id/
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3 votes
Accepted

Can bitcoin and altcoin co-exist in sidechain? If Yes, strategy

No, you cannot set the exchange rate between your private coins and the pegged coins, because you cannot issue the pegged coins yourself. The chain the pegged coins come from do still keeps track of ...
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3 votes

Digital currencies pegged to dollar value

NuBits is really interesting in how it pegs to the USD, which they explain in the white paper. I'm guessing you don't want to go hunting through there (white papers can be ... daunting), so the short ...
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  • 355
3 votes

electrum, jaxx, and exodus

Here is how to create a paper wallet for almost any Cryptocurrency : https://steemit.com/cryptocurrency/@bad.r2017/how-to-create-a-paper-wallet-for-any-cryptocurrency-in-7-steps
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3 votes
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How are gridcoin transactions validated?

Gridcoin is a proof-of-stake coin. Transactions are bundled and signed like any other blockchain, but with proof-of-stake the chance to sign is determined by coin balance and the time since your last ...
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3 votes

Is PBFT a consensus algorithm?

PBFT is Practical Byzantine Fault Tolerance. It is a "classical" consensus algorithm that uses a state machine. Uses leader and block election to select a leader. PBFT is a three-phase, network-...
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3 votes

Can the coin symbol prefix in a cloned NXT blockchain start with a digit?

No, adding a coin symbol prefix is not doable as it will impact other functions that might take it as a parameter. Your better off just doing it on the front end using a css :before class using the ...
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3 votes

Can an account prefix in a NXT clone blockchain be longer than three characters?

No, currently the account prefix (ACCOUNT_PREFIX constant) must be exactly 3 characters. This could be fixed in future.
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3 votes
Accepted

A Blockchain that merges mining forks and could be more power-efficient?

Something that is very similar to what you describe is the concept of "Uncle Blocks" used in Ethereum. Even there, though, there are no partial blocks and nobody would continue to mine on a "half-...
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  • 63.6k
3 votes
Accepted

Can a blockchain have duplicate block hashes?

Assuming SHA256 isn't broken, this isn't possible in Bitcoin, as the only way to find data that hashes to the same thing is when the data is the same. Since every Bitcoin block contains a hash of its ...
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2 votes

Is there a way to set up proof-of-work systems so they would be even more useful?

If you made the computation "useful" in some other sense, then in principle you could just sell that "useful" output, and thereby decrease the net economic expenditure securing the blockchain, making ...
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2 votes

How are some coins premined?

There are various ways to premine coins, some are use for scam coins and others are used by experimental altcoins. The premining made by scam coins are usually made with 3 methods: 1-At the first ...
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  • 21
2 votes

How to experience the thrill of mining?

Run Bitcoin Core with the -regtest flag set: For situations where interaction with random peers and blocks is unnecessary or unwanted, Bitcoin Core’s regression test mode (regtest mode) lets you ...
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  • 2,226
2 votes
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Bitcoin related research areas

Selfish mining is probably one of the most addressed issues that was theorized by a group at Cornell university. I find this interesting, because rather than being a technical issue such as ...
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  • 5,124

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