The index is stored at a single RocksDB database using the following column families. Most of the data is stored in key-only DB rows (i.e. having empty values).
Allows efficiently finding all funding transactions for a specific address:
| Script Hash Prefix | Confirmed Block Height |
|---|---|
SHA256(script)[:8] |
height as u32 |
Allows efficiently finding spending transaction of a specific output:
| Previous Outpoint Prefix | Confirmed Block Height |
|---|---|
txid[:8] as u64 + vout |
height as u32 |
In order to save storage space, we map the 8-byte transaction ID prefix to its confirmed block height:
| Txid Prefix | Confirmed height |
|---|---|
txid[:8] |
height as u32 |
Note that this mapping allows us to use getrawtransaction RPC to retrieve actual transaction data from without -txindex enabled
(by explicitly specifying the blockhash).
For faster loading, we store all block headers in RocksDB:
| Serialized header |
|---|
header as BlockHeader |
In addition, we also store the chain tip:
| Key | Value | |
|---|---|---|
T |
blockhash as BlockHash |
| Key | Value | |
|---|---|---|
C |
serialized config as JSON |