Linked Questions

2
votes
1answer
191 views

What is the length of largest known reorganization in bitcoin? [duplicate]

Usually there is an assumption, that a transaction is fully finalized after 6 confirmations, e.g. 6 blocks mined on top of the block, which includes given transaction. What is the length of largest ...
1
vote
0answers
89 views

Longest “natural” fork [duplicate]

Once a day, roughly, two competing blocks with the same height are mined, which leads to one of them being orphaned. Was there ever a "natural" case in which the fork lasted for two rounds? By ...
0
votes
0answers
13 views

Is there a real case where a very long blockchain got overtaken? [duplicate]

The longer the longest blockchain is, the harder it is to get overtaken by new blockchain with different sequence of transactions. But is there a case where it happened? What happened afterwards if ...
60
votes
5answers
27k views

What is a soft fork?

When people talk about possible changes to how Bitcoin works they sometimes say a particular change can be implemented as a soft fork. What does that mean? How does this compare to a hard fork?
8
votes
4answers
6k views

Will transaction confirmation time be reduced as the network size increases?

Right now it takes 6 confirmations, which takes about an hour to verify a transaction. Will the rate at which transactions confirm become faster over time?
11
votes
2answers
2k views

What's the longest chain of orphan blocks? (How many confirmations have been necessary?)

I believe my two title questions are the same (are they?): Heretofore, what is the longest chain of orphan blocks (of N blocks), such that if someone didn't wait for N+1 confirmations, they may have ...
8
votes
2answers
2k views

What happens if you set prune=<n> to a value between 0 and 550?

Today I saw a question about what Bitcoin Core would do if you set prune=1. The documentation on bitcoin.org states: A value of 0 disables pruning. The minimal value above 0 is 550. Apparently, ...
3
votes
2answers
1k views

Is there actual consensus on the blockchain's tip or only until the next block?

Using this scenario https://bitcoin.stackexchange.com/a/40435 Let's say we have two competing blockchain tips: They both start from Block A as a parent, but then there are two different blocks ...
5
votes
3answers
3k views

Getting orphaned Blocks from the Blockchain

I'm very interested in doing some analysis of orphaned blocks, but to do so I'd have to have a good way of accessing them. Blockchain.info seems like a good place to start but I don't want to abuse ...
7
votes
2answers
521 views

What block numbers & hashes were discarded by the March 2013 blockchain fork?

When exactly (GMT) were these blocks mined?
5
votes
2answers
320 views

Can someone with an unlimited amount of money compromize the network?

I was reading this interesting discussion in the comments section on ZH where this guy was talking about how a single entity (think corrupt government and banksters) can throw money and processing ...
3
votes
1answer
906 views

Conflicted transactions in blockchain reorganizations

When my service detects a conflicted transaction (either sent or received) it rollbacks everything that was logically built upon this transaction. The "problem" is that transactions can go from ...
2
votes
2answers
71 views

Cryptocurrency acceptance

I heard that the recommended waiting confirmation time for a bitcoin transaction is 6 blocks/ 1 hour. So a shop which lets its customer to pay in bitcoin without any waiting for confirmation would ...
1
vote
1answer
154 views

How to track and handle double-spend attacks?

If a double-spend attack is pulled off, how to manually verify transactions via the bitcoin daemon and how to know how much amount lost? Will the saved transaction hash be re-usable to obtain info ...
0
votes
1answer
124 views

Detection of double spend in Bitcoin for aged transactions

This is just to verify my understanding of Bitcoin double spend detection. 1) Use of UTXO indexes : This ensures that there as been no spend from that output (transferred to recipient in Block of ...

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