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Dogecoin Core 1.7 Alpha
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Dogecoin Core 1.7 is a complete re-architecture of Dogecoin, changing from using the Litecoin client as its base, to Bitcoin 0.9. It's still Dogecoin, with the same Scrypt PoW algorithm, same reward schedule, but there are a lot of changes under the hood.
For the full Bitcoin 0.9 changelog, please see https://bitcointalk.org/index.php?topic=522014
Please note that this is a very early release, and a full audit of the code is still in progress. The client has been hard-coded to only work with testnet for now, to avoid the risk of damaging real wallets.
Downgrading
First and foremost, please note that downgrading from 1.7 to 1.6 is not trivial. 1.7 now uses Berkeley DB 5.1 as its default database (in place of 4.8), and as such may create database files which are incompatible with previous versions.
Rebranding to Dogecoin Core
Following in the footsteps of Bitcoin (Core), the Dogecoin reference client has been rebranded as "Dogecoin Core". This helps separate its identity from Dogecoin (the network).
dogecoin-cli
Where previously commands were sent to dogecoind by running "dogecoind ", 1.7 adopts the model from Bitcoin Core 0.9 where there is a separate "dogecoin-cli" executable which is used instead. This avoids the risk of accidentally trying to start two daemons at the same time, for example.
Transaction malleability-related fixes
Fixes for risk-cases involving transaction malleability have been added; this is particularly important for any merchants or exchanges using the built-in wallet system.
Testnet
As mentioned at the start of this document, the alpha-client is for use with the Dogecoin testnet only. This is an alternative Dogecoin blockchain which is not used for real transactions, and instead is intended for testing of experimental clients. Wallets and addresses are incompatible with the normal Dogecoin network, in order to isolate the two.
As "TestDoge" is essentially valueless, it can be acquired easily for testing, either by mining, or from a faucet such as http://testdoge.lionservers.de/