Topic: Is the data in blocks and chainstate equal on all systeems (Read 977 times)
Keep the chainstate obfuscation on Windows systems running 0.12 in mind. Its a simple XOR, but it would result in a different hash for the chainstate files, even if the orphans where identical compared to a Linux system.
It can be different. I know this because I used to have two different chains backups.
Deleted the bigger, problem solved.
This will usually work on the same system, but the OP is asking about different systems, so unless the two different systems did a fresh sync from scratch, odds are pretty good they have a slightly different set of blocks. historically there are about 1 one block reorg per day, ie about 1% chance for any given block. Given 600 second blocks and 6 second propagation time, maybe that is the reason.Deleted the bigger, problem solved.
https://bitcointalksearch.org/topic/are-there-any-actual-stats-on-chain-reorgs-by-depth-1403436 http://pastebin.com/LZxst5vD
So given two systems that are having different set of peers, I would think that after a week or so it is almost certain that they would have a different set of raw blocks and also a different DB
It can be different. I know this because I used to have two different chains backups.
Deleted the bigger, problem solved.
Deleted the bigger, problem solved.
Yes, every copy of the blockchain has to be the same, otherwise it wouldn't work 
I don't think this is entirely true.
Hello !
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
No. I think they might not be the same.
If I'm remembering correctly, Bitcoin Core keeps a record of all the orphaned blocks that it received. Since the system that you are comparing against might not have received the same orphaned blocks, the hashes of the files may not be the same.
at the time it receives it, it was the tip, so it gets added to the append only file. but the file is just a sequential storing of the chaintip and since block propagations will "often" create a one block reorg based on delay for the stronger block to reach nodes, it is highly unlikely any two nodes that are not very closely connected (all the time) would have identical contents
if you want a unique set of hashes, you need to iteration though and only use the mainchain
James
"often" is relatively speaking, the one block reorg is expected even without any attack type scenario. There are a few 3, 6, 30 block reorgs causes by non-propagation events and those actually might be identical for most the nodes
Yes, every copy of the blockchain has to be the same, otherwise it wouldn't work
I don't think this is entirely true.
Hello !
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
No. I think they might not be the same.
If I'm remembering correctly, Bitcoin Core keeps a record of all the orphaned blocks that it received. Since the system that you are comparing against might not have received the same orphaned blocks, the hashes of the files may not be the same.
Yes, every copy of the blockchain has to be the same, otherwise it wouldn't work
Hello !
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
I was wondering if you would take the hash of every file inside the blocks folder and
chainstate folder and compere these hashes of another system running bitcoin. Would these
be the same ? ( except ofcource the newest ones that are still written )
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