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32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
# Index Schema
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The index is stored at a single RocksDB database using the following schema:
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## Transaction outputs' index
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Allows efficiently finding all funding transactions for a specific address:
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| Code | Script Hash Prefix | Funding TxID Prefix | |
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| ------ | -------------------- | --------------------- | - |
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| `b'O'` | `SHA256(script)[:8]` | `txid[:8]` | |
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## Transaction inputs' index
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Allows efficiently finding spending transaction of a specific output:
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| Code | Funding TxID Prefix | Funding Output Index | Spending TxID Prefix | |
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| ------ | -------------------- | --------------------- | --------------------- | - |
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| `b'I'` | `txid[:8]` | `uint16` | `txid[:8]` | |
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## Full Transaction IDs
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In order to save storage space, we store the full transaction IDs once, and use their 8-byte prefixes for the indexes above.
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| Code | Transaction ID | | Confirmed height |
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| ------ | ----------------- | - | ------------------ |
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| `b'T'` | `txid` (32 bytes) | | `uint32` |
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Note that this mapping allows us to use `getrawtransaction` RPC to retrieve actual transaction data from without `-txindex` enabled
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(by explicitly specifying the [blockhash](https://github.com/bitcoin/bitcoin/commit/497d0e014cc79d46531d570e74e4aeae72db602d)).
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