By taking the secure cryptographic SHA256 hash of a document and embedding it in a DigiByte blockchain transaction that is then broadcast to thousands of servers across the planet in a decentralised manner.
A blockchain is a public ledger of all DigiByte transactions that have ever been executed. It is constantly growing as ‘completed’ blocks are added to it with a new set of recordings. The blocks are added to the blockchain in a linear, chronological order. Each node (computer connected to the DigiByte network using a client that performs the task of validating and relaying transactions) gets a copy of the blockchain, which gets downloaded automatically upon joining the DigiByte network. The blockchain has complete information about the addresses and their balances right from the genesis block to the most recently completed block.
DiguSign uses the public, decentralized DigiByte Blockchain which was launched on January 20th, 2014.