Update index.md

Added hacken and hackenproof to the list of security providers

Author: YevheniiBezuhlyi

src/content/developers/docs/smart-contracts/security/index.md

@@ -494,12 +494,16 @@ If you plan on querying an on-chain oracle for asset prices, consider using one
 
 - **[Runtime Verification](https://runtimeverification.com/)** - _Security company specializing in formal modeling and verification of smart contracts._
 
+- **[Hacken](https://hacken.io)** - _Web3 cybersecurity auditor bringing the 360-degree approach to blockchain security._
+
 ### Bug bounty platforms {#bug-bounty-platforms}
 
 - **[Immunefi](https://immunefi.com/)** - _Bug bounty platform for smart contracts and DeFi projects, where security researchers review code, disclose vulnerabilities, get paid, and make crypto safer._
 
 - **[HackerOne](https://www.hackerone.com/)** - _Vulnerability coordination and bug bounty platform that connects businesses with penetration testers and cybersecurity researchers._
 
+- **[HackenProof](https://hackenproof.com/)** - _Expert bug bounty platform where blockchain projects only pay for verified, relevant and in-scope bug reports._
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 ### Publications of known smart contract vulnerabilities and exploits {#common-smart-contract-vulnerabilities-and-exploits}
 
 - **[ConsenSys: Smart Contract Known Attacks](https://consensys.github.io/smart-contract-best-practices/attacks/)** - _Beginner-friendly explanation of the most significant contract vulnerabilities, with sample code for most cases._