# Changelog
All notable changes to this library will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this library adheres to Rust's notion of
[Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]
### Changed
- MSRV is now 1.51.0.
- Bumped dependencies to `ff 0.11`, `group 0.11`, `bls12_381 0.6`, `jubjub 0.8`.
- `epk: jubjub::ExtendedPoint` has been replaced by
  `ephemeral_key: zcash_note_encryption::EphemeralKeyBytes` in various places:
  - `zcash_client_backend::wallet::WalletShieldedOutput`: the `epk` field has
    been replaced by `ephemeral_key`.
  - `zcash_client_backend::proto::compact_formats::CompactOutput`: the `epk`
    method has been replaced by `ephemeral_key`.
- Renamed the following in `zcash_client_backend::data_api` to use lower-case
  abbreviations (matching Rust naming conventions):
  - `error::Error::InvalidExtSK` to `Error::InvalidExtSk`
  - `testing::MockWalletDB` to `testing::MockWalletDb`
- Account identifier variables that were previously typed as `u32` have
  been updated to use a bespoke `AccountId` type in several places.
- A new error constructor SqliteClientError::TransparentAddress has been added 
  to support handling of errors in transparent address decoding.
- The `Builder::add_sapling_output` method now takes its `MemoBytes` argument
  as a required field rather than an optional one. If the empty memo is desired, use
  MemoBytes::from(Memo::Empty) explicitly.
- The `SaplingBuiilder::add_output` method has now similarly been changed to take
  its `MemoBytes` argument as a required field.
## [0.5.0] - 2021-03-26
### Added
- `zcash_client_backend::address::RecipientAddress`
- `zcash_client_backend::data_api` module, containing the Data Access API.
- `zcash_client_backend::wallet`:
  - `AccountId`
  - `SpendableNote`
  - `OvkPolicy`
- `zcash_client_backend::welding_rig::ScanningKey` trait, representing a key
  which can be used for trial decryption of outputs, and optionally nullifier
  computation. This trait is implemented for
  `zcash_primitives::zip32:ExtendedFullViewingKey` and
  `zcash_primitives::primitives::SaplingIvk`.
- First alpha of TZE support, behind the `zfuture` feature flag.

### Changed
- MSRV is now 1.47.0.
- `epk` fields and return values were changed from a `jubjub::SubgroupPoint` to
  a `jubjub::ExtendedPoint`, to match the change to the `zcash_primitives`
  decryption APIs:
  - `zcash_client_backend::proto::compact_formats::CompactOutput::epk()`
  - The `epk` field of `zcash_client_backend::wallet::WalletShieldedOutput`.
- `zcash_client_backend::decrypt`:
  - `decrypt_transaction` now takes a variable with type
    `P: zcash_primitives::consensus::Parameters`.
  - The `memo` field of `DecryptedOutput` now has type `MemoBytes`.
- `zcash_client_backend::wallet`:
  - The `nf` property of `WalletShieldedSpend` now has the type `Nullifier`.
  - The `account` property of `WalletShieldedSpend` and `WalletShieldedOutput`
    now has the type `AccountId`.
- `zcash_client_backend::welding_rig`:
  - `scan_block` now takes `&[(AccountId, K: ScanningKey)]`, instead of a
    slice of extended full viewing keys with implicit account IDs.
  - The `nullifiers` argument to `scan_block` now has the type
    `&[(AccountId, Nullifier)]`.

### Removed
- `zcash_client_backend::constants` module (its sub-modules have been moved into
  `zcash_primitives::constants`, and more generally replaced by the new methods
  on the `zcash_primitives::consensus::Parameters` trait).

## [0.4.0] - 2020-09-09
### Changed
- MSRV is now 1.44.1.
- Bumped dependencies to `ff 0.8`, `group 0.8`, `bls12_381 0.3.1`,
  `jubjub 0.5.1`, `protobuf 2.15`.

## [0.3.0] - 2020-08-24
TBD

## [0.2.0] - 2020-03-13
TBD

## [0.1.0] - 2019-10-08
Initial release.