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blockchain_db: add k-anonymity to txid fetching

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Read more about k-anonymity [here](https://en.wikipedia.org/wiki/K-anonymity). We implement this feature in the monero daemon for transactions
by providing a "Txid Template", which is simply a txid with all but `num_matching_bits` bits zeroed out, and the number `num_matching_bits`. We add an operation to `BlockchainLMDB` called
`get_txids_loose` which takes a txid template and returns all txids in the database (chain and mempool) that satisfy that template. Thus, a client can
ask about a specific transaction from a daemon without revealing the exact transaction they are inquiring about. The client can control the statistical
chance that other TXIDs (besides the one in question) match the txid template sent to the daemon up to a power of 2. For example, if a client sets their `num_matching_bits`
to 5, then statistically any txid has a 1/(2^5) chance to match. With `num_matching_bits`=10, there is a 1/(2^10) chance, so on and so forth.

Co-authored-by: ACK-J <60232273+ACK-J@users.noreply.github.com>
This commit is contained in:
jeffro256 2023-07-16 11:56:36 -05:00
parent 00fd416a99
commit b0bf49a65a
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GPG key ID: 6F79797A6E392442
13 changed files with 770 additions and 1 deletions
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12
utils/python-rpc/framework/daemon.py
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@ -590,6 +590,18 @@ class Daemon(object):
}
return self.rpc.send_json_rpc_request(flush_cache)
def get_txids_loose(self, txid_template, num_matching_bits):
get_txids_loose = {
'method': 'get_txids_loose',
'params': {
'txid_template': txid_template,
'num_matching_bits': num_matching_bits
},
'jsonrpc': '2.0',
'id': '0'
}
return self.rpc.send_json_rpc_request(get_txids_loose)
def sync_txpool(self):
sync_txpool = {
'method': 'sync_txpool',