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3
votes
3answers
83 views

Random numbers using blockchain

How are the block hashes generated? Are they trully 100% random (generated by hardware) or is it pseudo-random (generated by software)? Can i rely on it or any other blockchain data to make a 100% ...
1
vote
1answer
58 views

Is it correct that more than 160 bits of input data for producing a private key are superfluous?

If this is true, when I make a 64 character hexadecimal private key I need only provide randomness for the first 40 characters (40 x 4 bits per character = 160). The remaining 24 characters can be ...
1
vote
2answers
43 views

What kind of random numbers source does getnewaddress in Bitcoin Core API (bitcoind) uses?

Is it an internal PRNG? Is it fed from /dev/random or /dev/urandom? How secure is it? If I have a hardware (TRNG) plugged in feeding my /dev/random will this source of entropy get used by bitcoind?
1
vote
0answers
38 views

Non LuckyCoin descendant alt-coins with fair “lucky blocks”?

Dogecoin just dropped the "lucky block" stuff after it was found out the "luckiness" wasn't entirely random - multiminers were waiting for the lucky blocks to appear and dropping their hashing power ...
1
vote
1answer
106 views

How can a Ripple contract use random values and reach consensus?

There an interesting page about contracts on the Ripple Wiki. My limited understanding of contracts is that like other transactions in Ripple, it is the consensus across many servers that ensures ...
3
votes
2answers
93 views

How many throws of a dice are necessary to defeat a brute force attack?

At bitaddress.org I have decided to use "Brain Wallet" and create my own physical randomness using dice. (I understand that dice are more effective than entering dozens of random keys on the ...
0
votes
2answers
210 views

Are pseudo-random number generation algorithms good enough to cover all possible Bitcoin addresses?

Part of why Bitcoin works is that it's completely unlikely for someone to end up with the same Bitcoin address. But since Bitcoin address generation is based on pseudo-random generation it raises the ...
2
votes
0answers
324 views

How to determine how many coins have been mined regardless of block count in main.cpp

Been working my way trough the main.cpp trying to see where this value is grabbed if at all. I need a way to check how many coins have been mined regardless of block count. For example if every ...
4
votes
3answers
112 views

Are generated public/private keypair the most random possible?

The number of possible Bitcoin private/public keypair is very strong (2^160 which is 1,461501637×10⁴⁸). However, if the random generator is not good enough, only a subset of all that "space" could be ...
4
votes
1answer
201 views

Where is the bitcoin automatic address generation?

I have head of the automatic bitcoin address generation feature for every transaction. I have done multiple transaction, but I still have the same addresses (I have two addresses). I would like to ...
5
votes
1answer
799 views

Why do transaction/blockchain based gambling sites use such complicated methods for proving fairness?

Doesn't the block hash or the transaction id provide enough entropy (for example, by using block_hash % 37 to generate a random number between 0 and 36)? Block Chain Roulette determines the lucky ...
6
votes
1answer
327 views

Are transaction hashes random?

Why does satoshidice have to re-hash the transaction details in order to determine your "lucky" number? Are there no publicly viewable randomized numbers or hashes that are impossible for the sender ...
2
votes
2answers
311 views

Need a random seed for vanitygen; where can I obtain one?

Vanitygen has the option for a file to contain random numbers as an alternative to the built-in random number generator. What is the correct way to generate this file on Windows, OSX? (and Linux) ...
7
votes
1answer
1k views

How can a wager with SatoshiDICE be proven to be fair?

What steps will let a person manually verify that the DICE roll was fair?