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# AccountID

The ID for a cryptocurrency account.

| Field            | Type  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| ---------------- | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `shardNum`       | int64 | The shard number (nonnegative)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| `realmNum`       | int64 | The realm number (nonnegative)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| one of account { |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| `accountNum`     | int64 | A nonnegative account number unique within its realm                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| `alias`          | bytes | The public key bytes to be used as the account's alias. The public key bytes are the result of serializing a protobuf Key message for any primitive key type. Currently only primitive key bytes are supported as an alias (ThresholdKey, KeyList, ContractID, and delegatable\_contract\_id are not supported). At most one account can ever have a given alias and it is used for account creation if it was automatically created using a crypto transfer. It will be null if an account is created normally. It is immutable once it is set for an account. If a transaction auto-creates the account, any further transfers to that alias will simply be deposited in that account, without creating anything, and with no creation fee being charged. |
| }                |       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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