diff --git a/README.md b/README.md
index b649e72..c008af8 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ _________                        __           ________          _________
 - [Solidity language cheatsheets, tools and references collection](https://graph.org/Solidity-Cheatsheets-Pack-03-20)
 - [All known smart contract-side and user-side attacks & attack vectors](https://graph.org/All-known-smart-contract-side-and-user-side-attacks-and-vulnerabilities-in-Web30--DeFi-03-31)
 - [All possible transaction analysis, crypto-forensics and investigation tools list & references in a single note](https://graph.org/TX-Analysis-tools-04-19)
+- [Key principles of storing crypto cold wallet attacks defense methods best practices](https://graph.org/Key-principles-of-storing-crypto-cold-wallet-attacks-defense-methods-best-practices--Bonus-04-23)
 
 
 #### Problem 1