The #ethereum_blockchain. The structure of the #ethereum blockchain is very similar to bitcoin's, in that it is a shared record of the entire transaction history. To make future transactions, the bitcoin network must add up all your pieces of change, which are classed as either 'spent' or 'unspent'.
Ethereum aims to abstract away bitcoin's design, however, so that developers can create applications or agreements that have additional steps, new rules of ownership, alternative transaction formats or different ways to transfer state.
The goal of #ethereum's 'Turing-complete' programming language is to allow developers to write more programs in which #blockchain transactions could govern and automate specific outcomes.