# AccountData
## Properties
**sequence_number** | **String** | A string containing a 64-bit unsigned integer. We represent u64 values as a string to ensure compatibility with languages such as JavaScript that do not parse u64s in JSON natively. |
**authentication_key** | **String** | All bytes (Vec<u8>) data is represented as hex-encoded string prefixed with `0x` and fulfilled with two hex digits per byte. Unlike the `Address` type, HexEncodedBytes will not trim any zeros. |
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