This release promotes the `z_shieldcoinbase` RPC method to be fully-supported,
and adds a new experimental feature: payment disclosure. It also includes
performance improvements and bug fixes.

For complete changes, see:

- doc/release-notes/release-notes-1.0.12-rc1.md
- doc/release-notes/release-notes-1.0.12-rc2.md
- doc/release-notes/release-notes-1.0.12.md