Hello to all! For fast transaction processing and security, which of the two protocols is better?

CryptoNote or Scrypt?

https://en.wikipedia.org/wiki/CryptoNote
https://en.wikipedia.org/wiki/Scrypt

How to check the balance of the list of 1 million Bitcoin Addresses? Is there such a program?

["R"]

Hello!!! Please explain why earlier the repeated values of "R" occurred in Bitcoin translations.

For example, this transaction has a repetition of the value "R":
https://www.blockchain.com/btc/tx/19d66411a5aa716a04b37197c11c93c9446a54694a2d2302093d8b0a93ed5d83

If you look at RawTX:
https://btc.com/19d66411a5aa716a04b37197c11c93c9446a54694a2d2302093d8b0a93ed5d83.rawhex

repeat value "R":

R = cabc3692f1f7ba75a8572dc5d270b35bcc00650534f6e5ecd6338e55355454d5

What was the reason for this? Explain the reason for this error?

[secp256k1]

Is it possible to find at least one private key from any public key from the list from the large list of compressed public keys secp256k1?

Public keys: https://drive.google.com/drive/folders/1HByDJR9Ck5CdIwTl-v_IzcaVhsG8aKaA

As I know, this list contains 15 million compressed public keys.

Is it possible to use any method for such a large list of compressed public keys in order to finally find at least one private key?

Greetings to all friends! Tell me please, I heard that on this forum or GitHub there is a large list of found Bitcoin private keys where BTC transactions have ever been. (with Balance: 0 BTC)
Please share this information.