Update 2.md

Author: Sm4rty-1

data/2.md

@@ -7,4 +7,4 @@ As written in the [solidity documentation](https://docs.soliditylang.org/en/deve
 Check before any low-level call that the address actually exists, for example before the low level call in the callERC20 function you can check that the address is a contract by checking its code size.
 
 ### References:
-https://github.com/code-423n4/code423n4.com/blob/main/_data/reports/2022-04-axelar.md#m-01-low-level-call-returns-true-if-the-address-doesnt-exist
+https://blog.solidityscan.com/secure-account-existence-check-for-low-level-calls-468269bdd899