According to Robert Materzanni, CEO of Lukka, Large institutions like Coindesk and Kraken do not make a blockchain request for every transcaction. I infer that they also do not store individual blockchains for each customer.
LUKKA: SOLVING DATA CHALLENGES IN CRYPTO
Let’s talk about speaking the language of Trump….
The second they admit that the Kraken was all made up, they are exposed as authoritarians trying to subvert the constitution.