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Why we wrote Beancounter #55
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Pull Request Test Coverage Report for Build 250
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alokmenghrajani
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Jan 29, 2019
mcpherrinm
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Jan 29, 2019
WHY.md
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| https://github.com/bitcoinbook/bitcoinbook (or the paper version of the book) is a good place to learn more about the underlying structures. | ||
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| # What is a Bitcoin wallet? | ||
| A wallet is a collection of addresses. For [Hierarchical Deterministic wallets][bip32] (which is what we use), each wallet has a huge number of addresses (2^31). To figure out the balance, we need to find each addresses’ balance and sum things up. Doing the following would however be extremely slow: |
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don't we have multiple levels in a path, so it's actually even bigger? Or does beancounter not handle that?
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typically, a given derivation is fixed, except for the 2^31 addresses * 2 (change vs non-change). So 2^32.
WHY.md
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| # Random other issues/thoughts | ||
| - Electrum API is a little painful to use. E.g. some methods return a stream of results, but we only want one result. No way to unsubscribe from the stream. | ||
| - Electrum’s API versioning is a little messy—not 100% backwards compatible and the initial client library we picked wasn’t very well implemented. | ||
| - Running a node (for development purpose) takes a long time to sync and requires a large SSD (at least 250GB ~ Oct ‘18). For some reason, the btcd node takes ~4 days for its initial sync (what is it doing?). |
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wasn't it ~7 days actually for btcd?
Co-authored-by: Alok Menghrajani <alok@squareup.com>
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alokmenghrajani
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Feb 1, 2019
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