Introduction

The digital signature is an important mechanism ensuring the message or transaction integrity - one of the three CIA cybersecurity triad cornerstones.

We will review several signature types and justify why we use a specific one. Here's the list of the most popular digital signatures:

1. One-time Signature
   1.1 LOTS (Leslie Lamport One-Time Signature)^1
   1.2 WOTS (Winternitz One-Time Signature)^2
   
2. Multisignature
   2.1 Drawbacks of Public Key Cryptography
   2.2 Multisignature as a solution
   2.3 Classical Multisignature (Was used by the Bridge v1.0)
   2.4 Joint Multisignature (Used by the Bridge v2.0)
   
3. Threshold Signature
4. Group Signature
5. Ring Signature
6. Blind Signature