Most Popular
1500 questions
9
votes
1 answer
What are the trade-offs between the different algorithms for deciding which UTXOs to spend?
When someone would like to make a transaction, their software has to choose which of their UTXOs to spend. Here are a few different ways that one might prioritize which UTXOs get spent.
Oldest UTXOs first
Newest UTXOs first
UTXOs with the smallest…
morsecoder
- 14,168
- 2
- 42
- 94
9
votes
3 answers
Relation between Network Hash-Rate & bitcoin value?
how is the relation betweeen network hash rate to healthyness of bitcoin, such as bitcoin value compared to USD, or the growth rate of this currency?
uray
- 547
- 5
- 8
9
votes
3 answers
How can an online wallet be more secure than paper wallets or cold storages?
Recently, after I was reading that some bitcoin early adopter lost 750 BTC due to theft from his macbook, I was looking for the most secure storage solution for my coins.
I already know about paper wallets and cold storage solutions but I somehow…
q9f
- 1,445
- 3
- 22
- 47
9
votes
1 answer
Reduce difficulty on testnet-in-a-box?
I'm doing some testing and often find myself needing to generate 6 blocks quickly to confirm some tx. Each block takes a few minutes to generate on my macbook so this slows things down considerably.
Is there a way to adjust difficulty? Note that…
Brian Armstrong
- 739
- 4
- 18
9
votes
1 answer
How to quickly check your mining speed?
Is there some website that provides some webminer or other way for a person to check their mining speed without actually joining any pool or doing solo mining? Alternatively, are there some miners that can be pre-configured to perform mining on a…
ThePiachu
- 43,091
- 25
- 139
- 348
9
votes
3 answers
How can I get the uncompressed public key from the compressed public key in openssl?
Given a private key, I can get the uncompressed or compressed version of the public key like so.
EC_KEY* pKey = EC_KEY_new_by_curve_name(NID_secp256k1);
std::vector getPubKey(EC_KEY* pKey, bool compressed) const {
if…
user299648
- 471
- 1
- 4
- 12
9
votes
2 answers
debug.log file size
According to this comment, the debug.log file in the Bitcoin application data directory should be truncated on startup if it is bigger than 10MB. I'm running Bitcoin 0.5.2 on Windows 7 and it does no such thing - the file keeps increasing in size…
Meni Rosenfeld
- 19,700
- 37
- 70
9
votes
2 answers
Could any standard fee transaction be double spent by using a higher fee?
I realize that if somebody makes a transaction without any fees and there have not yet been any confirmations, then the transaction could be double spent by just spending the same inputs to a different address, but with a standard fee.
My question…
DJG
- 441
- 5
- 11
9
votes
2 answers
How secure is calling bitcoind JSON-RPC?
How secure is calling bitcoind through a JSON-RPC? For example, if I run it on one of my computers, and try calling it from another computer (provided neither of them are compromised), can someone intercept my communication and gain my RPC username…
ThePiachu
- 43,091
- 25
- 139
- 348
9
votes
3 answers
ECDSA Signature and the "z" value
The following link contains details on how to reverse the ECDSA signature if given two identical "R" values.
http://www.nilsschneider.net/2013/01/28/recovering-bitcoin-private-keys.html
I have read over this and there's one part I don't understand;…
Mine
- 1,406
- 2
- 16
- 27
9
votes
1 answer
How many coins does Satoshi have?
There are rumors that the creator of Bitcoin, Satoshi Nakamoto, currently possess as much as 1.5m bitcoins.
What are the steps involved to determine / guess how many coins Satoshi has?
Pacerier
- 2,105
- 2
- 21
- 33
9
votes
1 answer
What are pros and cons of Tendermint?
The writer describes it as a "solution to the blockchain consensus problem that does not require mining."
The white paper is viewable here:
http://tendermint.com/docs/tendermint_v04.pdf
I don't mean what are the pros and cons in relation to Bitcoin…
user1205901 - Слава Україні
- 285
- 1
- 9
9
votes
1 answer
How can Blackcoin get 1st confirmation in 10 seconds?
According to it's official page, Blackcoin used scrypt as its Proof-of-Work during the phase of initial coins' creation. But now it's purely Proof-of-Stake, and they claim to have a speed of just 10 seconds for first confirmation (and only needing…
Joe Pineda
- 2,118
- 2
- 18
- 28
9
votes
3 answers
How can an unconfirmed transaction be removed from the memory pool?
Using Bitcoind and Json-RPC, how can I remove an unconfirmed transaction from the memory pool?
The scenario being that I want to remove the unconfirmed transaction because it's not getting confirmed, and it's preventing me from sending new…
Flavien
- 1,037
- 1
- 9
- 17
9
votes
1 answer
How do I find the hash "market share" of P2Pool?
P2Pool is a peer to peer mining pool, offering some advantages over centralized pools:
There is no central node to take down (assuming the pool is indeed fully decentralized). Pools have suffered from DDOS attacks in the past.
An open source P2P…
ripper234
- 26,550
- 30
- 111
- 246