The first and most secure model is the one followed by Dash Core, also known as a “thick” or “full chain” client. This security model assures the validity of the block chainblock chain - A chain of blocks with each block referencing the block that preceded it. The most-difficult-to-recreate chain is the best block chain. by downloading and validating blocksblocks - One or more transactions prefaced by a block header and protected by proof of work. Blocks are the data stored on the block chain. from the genesis blockgenesis block - The first block in the Dash block chain. all the way to the most recently discovered block. This is known as using the height of a particular block to verify the client’s view of the network.
For a client to be fooled, an adversary would need to give a complete alternative block chain history that is of greater difficulty than the current “true” chain, which is computationally expensive (if not impossible) due to the fact that the chain with the most cumulative proof of workproof of work - A hash below a target value which can only be obtained, on average, by performing a certain amount of brute force work---therefore demonstrating proof of work. is by definition the "true" chain. Due to the computational difficulty required to generate a new block at the tip of the chain, the ability to fool a full node becomes very expensive after 6 confirmationsconfirmations - A score indicating the number of blocks on the best block chain that would need to be modified to remove or modify a particular transaction. A confirmed transaction has a confirmation score of one or higher.. This form of verification is highly resistant to Sybil attacks---only a single honest networknetwork - The Dash P2P network which broadcasts transactions and blocks. peerpeer - A computer that connects to the Dash network. is required in order to receive and verify the complete state of the "true" block chain.
Updated almost 2 years ago