[gojomo]

Blockchain.info is storing a centralized database for Bitcoin. Just not the centralized database... because there's not any official one. They're a value-added replica (via indexing & UI), not a constitutional authority.

(They have some earned authority, by a record of useful service.)

[ars_technician]

It's not 'a centralized' database at all. Calling it that only adds to the confusion.