v6.6.0

Changes in this release:

• Added Qtum and Groestlcoin support.
• Updated Zcash consensus branch id to 'Heartwood' for transaction signing.
• Fixed back button for 'Test Recovery Sentence' screen.
• Added v6.5.1 firmware support in KKClient.
• Added support for user defined Blockcypher api token for metadata storage.
  The master api token from KeepKey is defunc and no longer works.
• Added support for Google Firebaseio as an alternative metadata store.

ℹ️ Important Note:

The original KeepKey Client stores non-critical wallet metadata on api.blockcypher.com. This is how the extension
keeps track of wallets created and knows what to display after startup. This is non-critical since it can always be
recreated or recomputed from the seed on the device.

As of Oct. 2020, the blockcypher api token: d9a5e85023faa87914a191f6a741a2c4 supply by the original client is
defunct and no longer works. Starting with v6.6.0 release, users can specify which cloud store service to use for
saving their wallet metadata: either api.blockcypher.com or google's firebaseio realtime database service. Create an
api token with either and then copy+paste it to the top of Background.js file and save. When you first start the
extension, the wallet list will be blank except for btc even if you have other altcoins in your wallet. Just recreate any
missing wallets with 'Add Account'.

For convenience, this release has METADATA_API_TOKEN and FIREBASE_ID preset to use Google Firebaseio. Users
are encouraged to setup and use their api token for this if they wish to have control over their metadata.