All Questions
10 questions
1
vote
1
answer
73
views
I can't parse the UTXO from the chainstate
I have a problem with reading tx out from the Bitcoin Core LevelDB chainstate storage. I know that the structure of the current version of the chainstate is key => value where the key is a prefix (...
- 41
2
votes
1
answer
114
views
When does chainstate get updated?
What i'm trying to do now is reading LevelDB at chainstate folder to save all utxos at my own DB, and keep tracking the changes of utxos by looking at chainstate folder frequently.
However, what i ...
- 61
1
vote
0
answers
98
views
Cannot unserialize chainstate transaction outputs after de-obfuscation
I was able to read chainstate database.
Getting the key and de-obfuscating to get a valid last block.
However, when it comes to transactions that follow after that,
I cannot de-serialize them no ...
- 111
6
votes
1
answer
418
views
When the UTXO in the cache is full, what strategy is used to replace one UTXO with another in the cache?
The UTXO set is stored on the disk, but some UTXOs are also stored in the cache. When validating a transaction, you need to query the UTXO pointed to by the input of the transaction. First, you go to ...
- 185
2
votes
1
answer
479
views
bitcoin chainstate database parsing in python giving wrong value
I am trying to decode chainstate db for a specific out index for a transaction in python just for learning.
Transaction ID: 4d4a4c6ca4f3c91e69563199943336d3279fad71c9e8d9c1708ef9dc6ac16000
out index = ...
3
votes
2
answers
752
views
CVarint serialization format
Recently I started analyzing the UTXO set data that every full node stores in chainstate folder (a LevelDB database).
By looking into the code you can learn more or less how the data entries are ...
- 3,260
12
votes
1
answer
6k
views
Why is Bitcoin Core using LevelDB instead of Redis or SQLite?
Why did Core move from BDB to LevelDB? Why don't they use SQLite or move to Redis now? Is there a technical reason for this choice?
- 155
0
votes
1
answer
633
views
What is the memory usage for checking transaction inputs?
Whenever a transaction is received by a node, the node verifies its validity. To that end, it checks for each transaction input whether that input is part of the UTXO set. It is my understanding that ...
- 77.8k
6
votes
1
answer
639
views
Why does bitcoind use a fork of LevelDB for key-value storage?
Since 0.8 bitcoind uses LevelDB for the storage of the UTXO set in chainstate/ and the block index in blocks/index/. On github special branch of LevelDB can be found:
https://github.com/bitcoin/...
- 349
2
votes
1
answer
261
views
How does serializing in coins.h work?
I'm talking specifically about this:
/** pruned version of CTransaction: only retains metadata and unspent transaction outputs
*
* Serialized format:
* - VARINT(nVersion)
* - VARINT(nCode)
* - ...
- 237