What does this variable R mean

Question

What does this variable R mean if it is the same in transaction signatures, and can I find S Z from the transaction I want an explanation or someone helps me to find the variables

type address: 3AQYerxq4C2qmjthFpKCHYuoM8mzMRE9Q7 ADDRESS-R-SCAN: Data for pubkey: 3AQYerxq4C2qmjthFpKCHYuoM8mzMRE9Q7 has 50 Txs Fetching Txs from offset 0 Fetching Txs from offset 50 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value: 87c735eb8413a42fc856eec1ff432ef43c25 Resued R-Value:

Resued R-Value:

Address 3AQYerxq4C2qmjthFpKCHYuoM8mzMRE9Q7 has 15 reused R values!

Answer 1

ECDSA signing uses a random number called the nonce. A signature contains two numbers (r, S). r is generated only from the nonce and the nonce mustn't be reused. When the nonce is reused, r is the same too.

https://www.maximintegrated.com/en/design/technical-documents/tutorials/5/5767.html Eq 2 shows how r only depends on the S.

I don't know what you're referring to as Z.