There are a lot of articles describing how Ethereum is just another database, and a number of posts here on this site that talk about storing data on the blockchain itself (e.g., , ). However, my question is a bit more basic than those. Specifically, if a blockchain is just a database, then:
- What kind of database is this (e.g., relational database, nosql, registry-style key/value pairs, plain text, etc)? What any older technology can I look to for an understanding of how it works? This Quora question has answers that suggest both relational-style (by mentioning foreign keys) and key/value pairs, figured I'd ask here and see if I can get more consensus.
- How do I "read" a value from the database? How can I be sure I'm getting the most recent version of that (e.g., no transactions have taken place that update the value of this data)?