ICON is an open-source layer 1 delegated proof-of-stake (DPoS) blockchain and smart contract platform focused on connecting unique blockchains and their respective communities. ICON’s Blockchain Transmission Protocol (BTP) is a trustless and chain-agnostic interoperability solution that supports generic smart contract calls between connected blockchains.

Network not being able to confirm new transactions (Total network shutdown)

Unintended permanent chain split requiring hard fork (Network partition requiring hard fork)

Direct loss of funds

Permanent freezing of funds (fix requires hardfork)

Arbitrary transaction affecting ICON ledger

Change block data which is already finalised

Arbitrary smart contract (Score) call, updating or deleting Score without permission

Inconsistent data in partitioned blockchain

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

Unauthorized minting of NFTs

Predictable or manipulable RNG that results in abuse of the principal or NFT

Unintended alteration of what the NFT represents (e.g. token URI, payload, artistic content)

Protocol insolvency

Unintended chain split (Network partition)

Transient consensus failures not covered in Medium severity

Disability to make a new block(no consensus working)

Newly created block never comes to the finality

Theft of unclaimed yield

Theft of unclaimed royalties

Permanent freezing of unclaimed yield

Permanent freezing of unclaimed royalties

Temporary freezing of funds for any amount of time

Temporary freezing NFTs for any amount of time

RPC API crash

High compute consumption by validator/mining nodes

Attacks against thin clients

DoS of greater than 30% of validator or miner nodes and does not shut down the network

Attacking single node to shut down

Stopping a node from working properly

Smart contract unable to operate due to lack of token funds

Block stuffing for profit

Griefing (e.g. no profit motive for an attacker, but damage to the users or the protocol)

Theft of gas

Unbounded gas consumption

DoS of greater than 10% but less than 30% of validator or miner nodes and does not shut down the network

Underpricing transaction fees relative to computation time

Trivial minor bugs except the one related to consensus, safety, liveness, consistency

Smart contract fails to deliver promised returns, but doesn’t lose value

Modification of transaction fees outside of design parameters

Transient consensus failures in error cases caused by design, such as unknown exceptions in Java Execution Environment that trigger skip transaction logic

Rewards are distributed according to the impact of the vulnerability based on the [Immunefi Vulnerability Severity Classification System V2.3](https://immunefi.com/immunefi-vulnerability-severity-classification-system-v2-3/) This is a simplified 4-level scale, with separate scales for websites/apps, smart contracts, and blockchains/Distributed Ledger Technologies (DLTs), focusing on the impact of the vulnerability reported. 

All High and Critical Blockchain/DLT and Smart Contract bug reports require a Proof of Concept (PoC) to be eligible for a reward. Explanations and statements are not accepted as PoC and code is required.

ICON requires KYC to be done for all bug bounty hunters submitting a report and wanting a reward. If the entity is an individual, the information needed are Name, Address, Nationality, Birthday, copy of ID card, copy of residence certificate, criminal records and personal relations with politicians.
If the entity is a company, business start date, address, country the business base on, copy of business certificate. And some information about people who have over 20% of the company's share. The collection of this information will be done by the ICON project team.

To determine the final reward amount, the likelihood to have a meaningful impact on availability, integrity, and/or loss of funds is considered. The final decision on the payout amount will be determined by the ICON team at its discretion.

Payouts are handled by the __ICON__ team directly and are denominated in USD. However, payouts are done in __ICX__. If you disagree with the KYC requirement or you are denied by the KYC process, payouts cannot be done.