The Gridcoin blockchain is a public ledger of all transactions in the Gridcoin network. It is constantly growing as “completed” blocks are added to it with a new set of recordings. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. Bitcoin nodes use the block chain to differentiate legitimate Bitcoin transactions from attempts to re-spend coins that have already been spent elsewhere.
The Gridcoin client will download a full copy of the blockchain, which is currently about 20 GB. Once the initial sync is complete, the client will only need to download new blocks as they are added to the blockchain.
Other related questions:
Q: How do I sync my Gridcoin wallet?
A: There are a few ways to keep your Gridcoin wallet in sync:
1. Use the bootstrap file
2. Use a third-party service like Gridcoin.us
3. Run your own Gridcoin node
Q: How do I get Gridcoin?
A: Gridcoin can be obtained through exchanges, or by mining it.