On Cavetale, you can claim land as your own to protect against malicious players trying to break your projects or steal from you. Claimed land allows the owner to build in peace without worry of other players building on it. Claim owners also have the ability to allow who gets to build on their land. A claim reaches from the build height all the way down to bedrock.
All claim-related commands can be found by typing /Claim.
The number of claim blocks you have determines how large your claim can be. In order to acquire more claim blocks, you must purchase them via /claim buy [blocks]. Claim blocks are sold at a rate of 10 blocks per coin.