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Make sure to download only from official sources:
Official Groestlcoin Clients for Win, Mac, Linux

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Messages - GetBlock

GetBlock is a service that provides fast and easy API connection to over 40 full blockchain nodes, including Groestlcoin (GRS).

The service allows developers to build blockchain apps faster, as they don't need to worry about nodes configuration and maintenance.

Register on GetBlock and get a free API key in your account to test it out!