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Update LevelDB to upstream commit f545dfabf

Cherry-picked from the following upstream PRs:

- bitcoin/bitcoin#7911
- bitcoin/bitcoin#7982
- bitcoin/bitcoin#8133
- bitcoin/bitcoin#8784
  - Only the missing changes.
- bitcoin/bitcoin#8826
- bitcoin/bitcoin#8613
- bitcoin/bitcoin#10544
- bitcoin/bitcoin#10633
  - Only the changes to files and code we have.
- bitcoin/bitcoin#10806
- bitcoin/bitcoin#10958
- bitcoin/bitcoin#12451
- bitcoin/bitcoin#13925
- bitcoin/bitcoin#15270

This upgrades LevelDB in the exact same commit progression as upstream, up to January 2019.


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Zcash 4.0.0

What is Zcash?

Zcash is an implementation of the "Zerocash" protocol. Based on Bitcoin's code, Zcash intends to offer a far higher standard of privacy through a sophisticated zero-knowledge proving scheme that preserves confidentiality of transaction metadata. More technical details are available in our Protocol Specification.

This software is the Zcash client. It downloads and stores the entire history of Zcash transactions; depending on the speed of your computer and network connection, the synchronization process could take a day or more once the blockchain has reached a significant size.

🔒 Security Warnings

See important security warnings on the Security Information page.

Zcash is experimental and a work in progress. Use it at your own risk.

📒 Deprecation Policy

This release is considered deprecated 16 weeks after the release day. There is an automatic deprecation shutdown feature which will halt the node some time after this 16-week period. The automatic feature is based on block height.

Getting Started

Please see our user guide for joining the main Zcash network.

Need Help?

  • 📘 See the documentation at the ReadTheDocs for help and more information.
  • 📨 Ask for help on the Zcash forum.
  • 💬 Chat with our support community on Discord

Participation in the Zcash project is subject to a Code of Conduct.


Build Zcash along with most dependencies from source by running the following command:

./zcutil/ -j$(nproc)

Currently, Zcash is only officially supported on Debian and Ubuntu. See the Debian / Ubuntu build for detailed instructions.


For license information see the file COPYING.

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