CCA Cryptocurrency Transaction Auditing Questions and Answers 1 — Questions and Answers
Question 1: An auditor is analyzing a series of transactions on the Bitcoin blockchain and notices a pattern where a large input is broken down, with a small amount sent to one address and the larger remaining balance sent to a new 'change' address controlled by the original sender. This process is repeated multiple times. What is this specific transaction pattern called?
- Smurfing
- Peel Chain (Correct answer)
- Chain Hopping
- Layering
Correct answer: Peel Chain
A peel chain is a method used to obscure the flow of funds where transactions are structured to 'peel off' small amounts of cryptocurrency to various addresses, while the bulk of the funds is moved to new change addresses in a sequential chain, making it difficult to trace the original source.
Question 2: During a compliance audit of a virtual asset service provider (VASP), an auditor is required to verify that the VASP is screening transactions against sanctioned cryptocurrency addresses. Which U.S. government agency's list is the most critical for this specific compliance check?
- Financial Crimes Enforcement Network (FinCEN)
- Securities and Exchange Commission (SEC)
- Office of Foreign Assets Control (OFAC) (Correct answer)
- Internal Revenue Service (IRS)
Correct answer: Office of Foreign Assets Control (OFAC)
The Office of Foreign Assets Control (OFAC) of the U.S. Department of the Treasury maintains the Specially Designated Nationals and Blocked Persons (SDN) list, which includes specific cryptocurrency addresses associated with sanctioned individuals and entities. VASPs are required to screen against this list to prevent sanctions violations.
Question 3: A Certified Cryptocurrency Auditor is tasked with verifying the existence and ownership of Bitcoin for a client. The client provides a list of their public addresses. What is the most effective procedure to confirm the client has control over the private keys associated with these addresses?
- Analyzing the transaction history for large incoming transfers.
- Using a block explorer to confirm the balance of each address.
- Requesting the client to sign a specific message with their private key. (Correct answer)
- Reviewing the client's wallet software and hardware configuration.
Correct answer: Requesting the client to sign a specific message with their private key.
The only definitive way to prove control over a private key is to use it to perform a cryptographic operation, such as signing a message. An auditor can provide a unique message, and if the client can produce a valid signature corresponding to the public address, it proves they control the associated private key.
Question 4: Which of the following is a primary audit challenge specifically associated with cryptocurrencies that use the Unspent Transaction Output (UTXO) model, like Bitcoin?
- Reconciling account balances from a central ledger.
- Verifying the execution of complex smart contract logic.
- Auditing for gas fees and transaction throughput.
- Aggregating total holdings from numerous individual outputs. (Correct answer)
Correct answer: Aggregating total holdings from numerous individual outputs.
In the UTXO model, a user's balance is not a single number but the sum of all individual, unspent outputs they control across the blockchain. For an auditor, this means they must identify and sum all relevant UTXOs to verify a total balance, which can be complex compared to an account-based model where the balance is explicitly stated.
Question 5: An auditor is reviewing a company's crypto transactions and identifies several transfers sent to a service that pools funds from multiple users, mixes them together, and then sends them to new destination addresses to obscure the on-chain trail. This activity is a significant red flag for what type of illicit activity?
- Insider trading
- Market manipulation
- Money laundering (Correct answer)
- Pump and dump schemes
Correct answer: Money laundering
The use of mixers or tumblers is a well-known technique for money laundering. These services are designed to break the traceability of funds on the blockchain, making it difficult for auditors and investigators to follow the money from illicit sources to its final destination.
Question 6: When auditing a decentralized finance (DeFi) protocol, what is the primary focus of a smart contract audit?
- Assessing the fair market value of the protocol's native token.
- Reviewing the protocol's marketing materials for accuracy.
- Analyzing the code for security vulnerabilities and logical errors. (Correct answer)
- Evaluating the KYC/AML procedures for the protocol's users.
Correct answer: Analyzing the code for security vulnerabilities and logical errors.
A smart contract audit is a thorough technical examination of the smart contract's code. Its main purpose is to identify security vulnerabilities, coding errors, and inefficiencies that could be exploited by malicious actors or lead to unintended behavior, thereby safeguarding user funds.
CCA Cryptocurrency Transaction Auditing Questions and Answers 1
An auditor is analyzing a series of transactions on the Bitcoin blockchain and notices a pattern where a large input is broken down, with a small amount sent to one address and the larger remaining balance sent to a new 'change' address controlled by the original sender.
This process is repeated multiple times.
What is this specific transaction pattern called?