IOP | Hinkal


4d: 6h remaining
Max Bounty
To be determined
Rewards Pool
To be determined
Vault TVL
To be determined
16 April 2024
07 May 2024
Rewards Token
Triaged by Immunefi
KYC Required
To be determined

This Boost Is Under Evaluation

16 April 2024 18:00 UTC
07 May 2024 21:00 UTC

Program Overview

Immunefi’s Invite Only Program is a form of Boost which is exclusively accessible to a select group of security researchers who have been specifically invited to participate based on their expertise and skills. These researchers receive a guaranteed fee for participation and additional reward for every valid bug found. Project assets are only visible to the whitelisted researchers.

Hinkal is an institutional-grade protocol enabling confidential on-chain transactions. Hinkal allows liquid funds and retail users to create private accounts and transact on major dApps in complete confidentiality (the origin and destination of transaction, value).

Hinkal defines the new privacy category where users have a complete private execution environment for their token experience. It means that Hinkal is not an obfuscation tool but a whole layer between the wallet and the dApps.

Hinkal solves major problems that privacy protocols faced before:

Compliance. Contamination risk happens when an illicit assets commingle with others in the shielded pool. Hinkal pioneered the term "Reusable attestation," which allows users to prove that they did KYC (B) somewhere on the crypto internet and use this proof to access the privacy layer.

Frictions to adoption. Public chains proved to accumulate the value, and Hinkal plugs in the current liquidity vs L1/L2 privacy infrastructure that does not provide enough value for migration of assets.

Privacy dApps facilitated a simple function of wallet obfuscation that can be achieved using centralized exchanges. Hinkal is a separate confidential execution layer focused on providing end-to-end experience, which means that after users deposit assets to a shielded address - they have everything to keep those assets inside: buy/sell tokens on major DEXs, stake, LP, and re-stake.

Currently, Hinkal offers 6 highest TVL dApps on 6 major EVM chains.

For more information about Hinkal, please visit

Hinkal provides rewards in USDC, denominated in USD.

Rewards by Threat Level

The following reward terms are a summary, for the full details read our Hinkal Invite Only Program Reward Distribution Terms.

Each participating whitehat will receive a guaranteed reward $2,500

On top of this, there are additional rewards per-unique-bug found:

  • $2,500 per Critical
  • $1,500 per High

For this Invite Only Program, duplicates and private known issues are valid for a reward.

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2.3.

Reward Payment Terms

Payouts are handled by the Hinkal team directly and are denominated in USD. However, payments are done in USDC.

Rewards will be distributed all at once based on Immunefi’s distribution formula after the event has concluded and the final bug reports have been resolved.

Smart Contract

$2,500 USD
PoC Required
$1,500 USD
PoC Required

Assets in scope

This is an invite-only boost. Therefore, in-scope assets are not publicly available.

Impacts in scope

Only the following impacts are accepted within this bug bounty program. All other impacts are not considered as in-scope, even if they affect something in the assets in scope table.

Smart Contract

  • Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield
  • Direct theft of any user NFTs, whether at-rest or in-motion, other than unclaimed royalties
  • Permanent freezing of funds
  • Permanent freezing of NFTs
  • Protocol insolvency
  • Theft of unclaimed yield
  • Permanent freezing of unclaimed yield
  • Temporary freezing of funds for more than 3 hours
  • Temporary freezing of NFTs for more than 3 hours

Proof of Concept (PoC) Requirements

A PoC, demonstrating the bug's impact, is required for this program and has to comply with the Immunefi PoC Guidelines and Rules.

Eligibility Criteria

Security researchers who wish to participate must adhere to the rules of engagement set forth in this program and cannot be:

  • On OFACs SDN list
  • Official contributor, both past or present
  • Employees and/or individuals closely associated with the project
  • Security auditors that directly or indirectly participated in the audit review

Responsible Publication

Whitehats may not publish their bug reports from this program.

However Immunefi will publish a leaderboard and high-level summary of the results of this program which whitehats can use for their portfolio.

Feasibility Limitations

The project may be receiving reports that are valid (the bug and attack vector are real) and cite assets and impacts that are in scope, but there may be obstacles or barriers to executing the attack in the real world. In other words, there is a question about how feasible the attack really is. Conversely, there may also be mitigation measures that projects can take to prevent the impact of the bug, which are not feasible or would require unconventional action and hence, should not be used as reasons for downgrading a bug's severity.

Therefore, Immunefi has developed a set of feasibility limitation standards which by default states what security researchers, as well as projects, can or cannot cite when reviewing a bug report.

Immunefi Standard Badge

By adhering to Immunefi’s best practice recommendations, Hinkal has satisfied the requirements for the Immunefi Standard Badge.

Out of Scope & Rules

These impacts are out of scope for this bug bounty program.

All Categories:

  • Impacts requiring attacks that the reporter has already exploited themselves, leading to damage
  • Impacts caused by attacks requiring access to leaked keys/credentials
  • Impacts caused by attacks requiring access to privileged addresses (governance, strategist) except in such cases where the contracts are intended to have no privileged access to functions that make the attack possible
  • Impacts relying on attacks involving the depegging of an external stablecoin where the attacker does not directly cause the depegging due to a bug in code
  • Mentions of secrets, access tokens, API keys, private keys, etc. in Github will be considered out of scope without proof that they are in-use in production
  • Best practice recommendations
  • Feature requests
  • Impacts on test files and configuration files unless stated otherwise in the bug bounty program

Blockchain/DLT & Smart Contract Specific:

  • Incorrect data supplied by third party oracles
  • Not to exclude oracle manipulation/flash loan attacks
  • Impacts requiring basic economic and governance attacks (e.g. 51% attack)
  • Lack of liquidity impacts
  • Impacts from Sybil attacks
  • Impacts involving centralization risks

Prohibited Activities:

  • Any testing on mainnet or public testnet deployed code; all testing should be done on local-forks of either public testnet or mainnet
  • Any testing with pricing oracles or third-party smart contracts
  • Attempting phishing or other social engineering attacks against our employees and/or customers
  • Any testing with third-party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
  • Any denial of service attacks that are executed against project assets
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty