[POC/WIP] Add optional Bip352 silentpayments index #1075
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jlest01
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but I can make silent payments to the node, from a client? |
antonilol
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Aug 22, 2025
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| if self | ||
| .index | ||
| .store | ||
| .iter_spending(SpendingPrefixRow::scan_prefix(outpoint)) | ||
| .next() | ||
| .is_none() |
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If I understand correctly, this must make sure only transactions with (P2TR) unspent outputs are scanned.
Making an index dependent on data from another index seems odd to me, I have some questions about this:
- Does this handle collisions of
spendingentries in the database (correctly)? - Wouldn't a user want historic data after restoring a wallet?
- Looking at the code,
spendingis made sure to be updated to the current chain tip and thentweaksis indexed (do I get this correctly?). This will include spent transactions (imagine 1 P2TR output TXs) as blocks get propagated, but not on the initial sync or when spent in the same block. Is this intended?
antonilol
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Aug 22, 2025
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| let height = index.chain.get_block_height(&hash).expect("Unexpected non existing blockhash"); | ||
| let mut value: Vec<u8> = u64::try_from(height).expect("Unexpected invalid usize").to_be_bytes().to_vec(); | ||
| value.extend(tweaks.iter()); | ||
| batch.tweak_rows.push(value); |
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If I understand correctly, the key of the stored key-value pair is the block height. Is RocksDB the right tool for the job then? I think this can easily be achieved using two files that only need appending when building/updating the index: one for the tweaks, and one for the offsets and lengths in the tweaks file, for every block (for random access).
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This PR proposes a new
--silent-payments-indexoption that creates an index of Bip352 silent payments.Most of the code is based on @Sosthene00's fork, but I made the following changes:
. It uses bitcoin-core/secp256k1#1519 and rust-bitcoin/rust-secp256k1#721 instead of the
rust-silentpaymentscrate.. It adds a new
--silent-payments-indexconfiguration option. Without this option, the server does not index silent payments and works the same as it does today.. The code does not use
Box[u8]indb.rs.To run this, something like the following command can be used:
cargo run -- --log-filters=INFO --db-dir <db_dir> --daemon-dir ~/.bitcoin/ --network signet --electrum-rpc-addr="127.0.0.1:60001" --silent-payments-index