v1.4.0

dcrwallet 1.4.0

This release focuses on bug fixes and general improvements for both direct
dcrwallet command line users and other projects building on top of dcrwallet
(such as Decrediton and upcoming mobile wallets). A new voting agenda is also
part of this release to enable votes on
DCP0004.
A comprehensive list of improvements and bug fixes follows.

Bug fixes

• Fixes were made to which and how many addresses and wallet UTXOs are watched
  by the SPV and RPC syncers. This prevents several bugs resulting from missed
  transactions, such as avoiding double spending errors and spends of unknown
  inputs.

• Committed filter creation and validation is fixed on all ARM processors.
  Previously, an ARM assembly optimization could produce incorrect output for
  the siphash function.

• During initial wallet creation, the database is now always cleanly closed
  before the process exits. Previously, this was a race and the new wallet
  database may have been missing writes during the initialization step.

• RPC connection errors to dcrd are now properly logged

• A possible deadlock situation was removed by adding a missing mutex unlock to
  the SPV peering implementation.

• Error handling has been improved when querying unmined and unspent ticket
  transactions.

• The total number of logged transactions processed by the RPC syncer has been
  fixed.

• The process can be interrupted at startup if while being blocked on acquiring
  the wallet's database lock. Previously, the process would have needed to be
  killed, or wait for an existing running wallet to shutdown.

New features

• The gRPC method WalletService.ValidateAddress now returns pubkey of P2PKH
  addresses and BIP0044 branch and child index if the address is controlled by
  the wallet.

• The gRPC method WalletService.ImportScript is now usable by watching-only
  wallets.

• The gRPC method WalletService.StakeInfo now includes counts of unspent
  tickets.

• A new gRPC method TicketBuyerV2Service.RunTicketBuyer has been added to run
  the SPV-compatible ticket buyer.

• A new gRPC method WalletService.GetTicket has been added to query the
  details of an individual ticket by its transaction hash.

• A new gRPC method WalletService.SweepAccount has been added to sweep all
  UTXOs of an account to a single new output.

• A new gRPC method WalletService.RpcSync has been added, providing a similar
  as SpvSync to perform wallet synchronization with a dcrd RPC connection.

• The SPV and RPC syncers now support callbacks for syncing notifications.
  These notifications are also availble to gRPC clients who invoke the syncers.

• Creating a new simnet wallet now shows an address that can be used for mining
  rewards.

• RPC syncing connections to dcrd can now be proxied using the --proxy,
  --proxyuser, and --proxypass options.

Other improvements

• Builds have been converted to use Go Modules. The repository has been split
  into various submodules, making it far easier to write applications that
  import dcrwallet packages as libraries.

• Wallet database API is exported for projects that need support for alternative
  database drivers (such as dcrandroid).

• Default transaction relay fee has been dropped to 0.0001 DCR/kB.

• Transaction size and fee estimation is improved for ticket purchases and any
  transaction that redeems a P2SH output.

• DCP0001-0003 now apply to simnet from the start of the chain (note that this
  is a hard fork for existing simnets).

• Log files are never automatically deleted. Previously, log files would be
  rotated and old log files would be automatically removed. This has been
  changed to avoid the loss of potentially important logs.

• Logs for unexpected database consistency issues have been improved by logging
  the keys and values

Changelog

All commits since the last release may be viewed on GitHub
here.