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# TransactionHeader

## Summary

| Members                                                                                                                     | Descriptions                                                                          |
| --------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------- |
| `public DateTime?` [`Expiration`](#class_eosio_signing_request_1_1_transaction_header_1a90d843c64f0de28b3dccc63f9f69d531)   | The time at which a transaction expires.                                              |
| `public ushort?` [`RefBlockNum`](#class_eosio_signing_request_1_1_transaction_header_1a9a4684ffa5ca96ca1bde63ed0d763e9f)    | Specifies a block num in the last 2^16 blocks.                                        |
| `public uint?` [`RefBlockPrefix`](#class_eosio_signing_request_1_1_transaction_header_1aae7718bb5471334ee1e7c2503d45f6f4)   | specifies the lower 32 bits of the blockid at get\_ref\_blocknum                      |
| `public uint?` [`MaxNetUsageWords`](#class_eosio_signing_request_1_1_transaction_header_1aa89040c3c91ec4766e05163ed9824cb5) | Upper limit on total network bandwidth (in 8 byte words) billed for this transaction. |
| `public byte?` [`MaxCpuUsageMs`](#class_eosio_signing_request_1_1_transaction_header_1ab5cd6164108a4759f559af0d11695dee)    | Upper limit on the total CPU time billed for this transaction.                        |
| `public uint?` [`DelaySec`](#class_eosio_signing_request_1_1_transaction_header_1a1ac2358c3cdbcc918797a51916437f97)         | Number of seconds to delay this transaction for during which it may be canceled.      |

## Members

**`public DateTime?`** [**`Expiration`**](#class_eosio_signing_request_1_1_transaction_header_1a90d843c64f0de28b3dccc63f9f69d531)

The time at which a transaction expires.

**`public ushort?`** [**`RefBlockNum`**](#class_eosio_signing_request_1_1_transaction_header_1a9a4684ffa5ca96ca1bde63ed0d763e9f)

Specifies a block num in the last 2^16 blocks.

**`public uint?`** [**`RefBlockPrefix`**](#class_eosio_signing_request_1_1_transaction_header_1aae7718bb5471334ee1e7c2503d45f6f4)

specifies the lower 32 bits of the blockid at get\_ref\_blocknum

**`public uint?`** [**`MaxNetUsageWords`**](#class_eosio_signing_request_1_1_transaction_header_1aa89040c3c91ec4766e05163ed9824cb5)

Upper limit on total network bandwidth (in 8 byte words) billed for this transaction.

**`public byte?`** [**`MaxCpuUsageMs`**](#class_eosio_signing_request_1_1_transaction_header_1ab5cd6164108a4759f559af0d11695dee)

Upper limit on the total CPU time billed for this transaction.

**`public uint?`** [**`DelaySec`**](#class_eosio_signing_request_1_1_transaction_header_1a1ac2358c3cdbcc918797a51916437f97)

Number of seconds to delay this transaction for during which it may be canceled.