Digital Signature and private/public key I am new to Bitcoin and Blockchain and I am writing a thesis for my university about this topic. 

I have a general question about digital signatures, which are needed to verify a transaction. 

As far as I understood, for having a digital signature, one need to have a public verification key and a secret key.

Is the secret key equal to the private key which is needed to spend transactions.

Analog: Is the public verification key the same as the public key whose hash is the bitcoin adress ?

Thank you in advance.
Is the secret key equal to the private key which is needed to spend transactions.


Yes 


  Analog: Is the public verification key the same as the public key whose hash is the bitcoin adress ?


Yes, also correct. You’re on the right track :)