# User FAQs

If you have a question that isn't answered here, please contact us in [our Discord](https://discord.gg/blockscout) and the team and community can help troubleshoot your issue.

## User FAQs

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<summary>What does the "in" or "out" label mean on a transaction?</summary>

This label appears next to a transaction to signify whether a transaction was sent or received by a particular address.

* <mark style="color:green;background-color:green;">**In**</mark>**:** A transaction was sent to the address
* <mark style="color:orange;background-color:orange;">**Out**</mark>**:** A transaction was initiated from the address

<img src="https://3049643675-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F38YKcjYqMJT3HBhioNFl%2Fuploads%2Fgit-blob-a086c13f186eb7cc39736b7189247faaf2af3478%2Ftx1.png?alt=media" alt="" data-size="original">

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<summary>What is CSV export error 504?</summary>

If you request too much data at the same time you may receive a timeout. Decreasing the period of time for an export (**1 week timeframe** is recommended for addresses with lots of transactions) can reduce these errors.

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<summary>How can I access and read/write contract methods?</summary>

Yes! The contract should be verified (or the bytecode matches an existing contract) to enable reading and writing to contracts and proxy contracts. [More info here](https://docs.quaiscan.io/developer-support/smart-contract-verification/interacting-with-smart-contracts).

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<summary>How do I verify a smart contract?</summary>

There are multiple methods including options from the Quaiscan UI as well as an integration directly with Hardhat.

**Quaiscan UI:**

* [Via flattened source code (Solidity)](https://docs.quaiscan.io/developer-support/smart-contract-verification#via-flattened-source-code)
* [Via standard JSON input](#via-standard-json-input)

**Hardhat:**

* [Hardhat Verification Plugin](https://docs.quaiscan.io/developer-support/smart-contract-verification/hardhat-verification-plugin)

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