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RE: Witness Update - Upgrading VPS, Back Online Shortly
Blockchains have blocks of data. Nodes have that data, and witness nodes verify the integrity and immutability of blocks. A witness get some steem for verifying/validating blocks int he blockchain. They can bring changes to the chain if they are in the top 19. So if you like what someone represents, what they stand for, and want to support them in their efforts, vote for their witness :)