Hierarchical Deterministic Wallet

• Added BIP44 support
  • Added BIP39 support
  • Added smaller ring signatures
    https://bitcointalk.org/index.php?topic=972541.msg10619684
  • The goal for this release is to implement a framework for BIP32
    on which to build, the more interesting features possible with bip32 keys can
    be implemented later. For this release we aim to implement a hierarchical
    deterministic wallet - which means you can recover all the keys in a wallet
    using only the master key.
  • Added basic BIP32 support

    • Each extended key can derive 2^31 normal child keys and 2^31 hardened
      child keys.

    • All new keys are deterministically generated from a master key.

      • The complete wallet state (except key labels) can be recreated from
        a single master key.

    • When the wallet is first started a new master bip32 key will be generated
      from the master key, internal (child 1) and external (child 0) chains are
      derived from the master key.

      The wallet will only generate a master key automatically once.
      If the first master key is removed a new key will need to be imported
      manually for the wallet to be able to generate keys.

    • New prefix for base58 data

      • extended key identifiers are represented in the same way as normal
        shadow addresses, to prevent confusion a new prefix has been added.
        Extended key identifiers begin with 'x' on live, on testnet with 'X'

    • New rpc function extkey, alias: bip32

      • path
        The path is a backslash deliminated string of digits.
        m/3/4h/5
        Only backslashes, digits and m, h and ' may occur in the path.

        The tokens m and 0 can only be first or last in the path.

      • examples:

        • extkey <bip32_key>
          • returns the child key according to the path
        • extkey gen
          • generates new key from random data
          • extkey
            Match bip32.org keys: bip32 gen "pass" 50000 "Bitcoin seed"

    • Notes

      • The change address of anon transactions is picked as the first stealth
        address of default account else the first legacy stealth address.
  • Added Gitian build descriptors
    • See contrib/gitian-descriptors/README
  • SMSG ScanBlock harvest public keys from coinstake transactions
  • Added "Txn Type" field to txnreport
  • Added 'env' parameter to getinfo
    • returns more environment specific information
  • Added simple command line interface to shadowcoind
    • enabled with new parameter "cli" when not started as a daemon
  • Added createmultisig rpc command
    • createmultisig does the same as existing command addmultisigaddress
      except that the resulting address and script are not added to the wallet.
  • decoderawtransaction scriptPubKey includes the hex representation
    • hex of a prevout scriptPubKey is required for signrawtransaction
  • signrawtransaction works when private keys are passed in as parameters
    • adds redeemScript to the tempKeystore
  • Added option to disable SMSG scanning of incoming blocks.
    • smsgoptions set scanIncoming false
  • smsgoptions command is now case insensitive
  • smsgoptions list takes a bool parameter to list option descriptions
  • dumpprivkey takes a pubkey as input
  • More unit tests enabled
  • The coin_selection_tests sometimes fail, it's related to the nSpendTime
    parameter and isn't a real error.
  • Gui improvements
  • Lock icon goes orange when system unlocked for staking only.
  • Table pagination icons limited to 5.