> ## Documentation Index
> Fetch the complete documentation index at: https://docs.allium.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Traces

Traces keep track of the actions that modify the internal state of the EVM.

<Info>
  Typically, `trace_id` for traces are unique, unless there are **duplicate transactions** on the blockchain.

  Refer [here](/historical-data/overview/data-faq/traces-id-and-address) for more information and examples.
</Info>

### Table Columns

| Column Name        | Description                                                                                                                                                                         |
| ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| transaction\_hash  | Unique identifier of the transaction that contains this trace.                                                                                                                      |
| transaction\_index | The position of this transaction in the block that it belongs to. The first transaction has index 0.                                                                                |
| from\_address      | The address of the sending party of this trace.                                                                                                                                     |
| to\_address        | The address of the receiving party of this trace (null for contract creation).                                                                                                      |
| value              | The amount of ether moved from the from\_address to to\_address.                                                                                                                    |
| input              | The bytecode of the call that is made to another smart contract.                                                                                                                    |
| output             | The bytecode answer the smart contract that was called gives back.                                                                                                                  |
| trace\_type        | The value of the method such as call, create, create2, suicide.                                                                                                                     |
| call\_type         | [The type of method such as call, delegatecall, staticcall. Learn more here.](https://medium.com/coinmonks/delegatecall-calling-another-contract-function-in-solidity-b579f804178c) |
| reward\_type       | Populated when trace\_type =reward. Possible values: block, uncle                                                                                                                   |
| gas                | Gas provided with the trace call, in wei.                                                                                                                                           |
| gas\_used          | The amount of gas consumed, in wei.                                                                                                                                                 |
| subtraces          | Number of children traces.                                                                                                                                                          |
| trace\_address     | The address of the trace within the call graph. More detail to come soon.                                                                                                           |
| error              | Human readable developer error message. Examples: "Out of gas", "Reverted", "Bad instruction", "Bad jump destination"                                                               |
| status             | Success status of the trace. Either 1 (success) or 0 (failure).                                                                                                                     |
| block\_timestamp   | The time when the block that contains this trace was included on the blockchain.                                                                                                    |
| block\_number      | The length of the chain, in blocks.                                                                                                                                                 |
| block\_hash        | Unique identifier of the block that includes this trace.                                                                                                                            |
| trace\_id          | Unique identifier for this trace. Generated by combining the trace\_type, transaction\_hash and trace\_address.                                                                     |
| selector           | Selector of the txn.                                                                                                                                                                |
| \_created\_at      | Timestamp of the entry creation.                                                                                                                                                    |
| \_updated\_at      | Timestamp of the entry update.                                                                                                                                                      |