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CH10: SPV privacy: update to account for compact block filters too

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Previously assumed bloom filters would be used.  Only small updates
needed.
This commit is contained in:
David A. Harding 2023-05-18 14:05:21 -10:00
parent 1e2a2252b3
commit 8b09a51b7b
1 changed files with 5 additions and 6 deletions
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ch08.asciidoc
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@ -1132,16 +1132,15 @@ the best possible privacy should still use their own full node.
=== SPV Clients and Privacy
Clients that implement SPV have weaker privacy than a full node. A full
node receives all transactions and therefore reveals no information
node downloads all transactions and therefore reveals no information
about whether it is using some address in its wallet. An SPV client
receives a filtered list of transactions related to the addresses that
are in its wallet. As a result, it reduces the privacy of the owner.
only downloads transactions that are related to its wallet in some way.
Bloom filters are a way to reduce the loss of privacy. Without them, an
Bloom filters and compact block filters are a way to reduce the loss of privacy. Without them, an
SPV client would have to explicitly list the addresses it was interested
in, creating a serious breach of privacy. However, even with bloom
in, creating a serious breach of privacy. However, even with
filters, an adversary monitoring the traffic of an SPV client or
connected to it directly as a node in the P2P network can collect enough
connected to it directly as a node in the P2P network may be able to collect enough
information over time to learn the addresses in the wallet of the SPV
client.