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I can use getblock json rpc method to get parsed block, but I need raw data.
Is there any way to get raw block data using bitcoin core?
How get raw block data?
Answers
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There's a boolean parameter to that RPC call that'll return it as a hex string representing the binary contents of the block.
If verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'
getblock 'hash' 0 should return what you want.
You can read it directly from the blk*.dat files... – Nate Eldredge – 2017-09-23T14:27:29.617
So to implement such method as getrawblock I need to create my own index with filename and offset for each block, right? – Andrey Lobarev – 2017-09-23T18:02:33.547
In principle you can use the existing leveldb database in the
– Nate Eldredge – 2017-09-24T02:26:16.240blocks/indexdirectory to locate the block data within the blk*.dat file by its hash. See https://en.bitcoin.it/wiki/Bitcoin_Core_0.11_(ch_2):_Data_Storage or https://bitcoin.stackexchange.com/questions/28168/what-are-the-keys-used-in-the-blockchain-leveldb-ie-what-are-the-keyvalue-pair for the data format.