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Author Topic: Testnet ClearCoin  (Read 1022 times)
Gavin Andresen
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April 25, 2011, 02:40:03 PM

I've deployed a -testnet version of ClearCoin, at:

It is fully functional, so feel free to creates some escrow transactions and get some testnet bitcoins from the the testnet faucet (which I will eventually move to

For anybody else developing on App Engine, here's what I did to make it work:

In my
  # Set testnet namespace                                                                                                               
  if 'test' in os.environ['CURRENT_VERSION_ID']:
CURRENT_VERSION_ID is the version of your app that's running, and is set by App Engine.
set_namespace makes all subsequent datastore and memcache operations read/write from a different database.  So almost all of the code for ClearCoin doesn't care whether it is handling testnet coins, it just works.

The only other change needed was a check for 'test' in os.environ['CURRENT_VERSION_ID'] when deciding which bitcoind server to use.  I run the -testnet bitcoind for ClearCoin on a different machine than the production bitcoind, so experiments on the test net won't affect the production ClearCoin at all.

If you're not running on App Engine, you should think about building in the equivalent of CURRENT_VERSION_ID and 'set_namespace' so deploying test and production versions of your application is easy.

How often do you get the chance to work on a potentially world-changing project?
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April 25, 2011, 07:54:56 PM


I encourage all bitcoin vendors to run a testnet version of their site, if feasible.  For example, PayPal provides a "sandbox" which includes all supported APIs, but no real money is transferred.  When developing sites that deal with money, being able to test without losing real money due to bugs is critical.
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