ycashd v2.1.1-3

This minor release of ycashd incorporates upstream Zcash Pull Request #4379, which fixes upstream Zcash Issue #4301. The issue involved this error message:

Assertion failed: ((nd->witnessHeight == -1) || (nd->witnessHeight == indexHeight - 1)), function CopyPreviousWitnesses, file wallet/wallet.cpp, line 1066.

If you encounter this error message, upgrading to this release should address the problem without requiring a reindex.

We consider this release to be an optional upgrade.