> For the complete documentation index, see [llms.txt](https://docs.zenprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zenprotocol.com/apps/wallet/wallet-structure/contracts/execute-contract/message-body-field.md).

# Message Body Field

This field expect a [YAML](https://en.wikipedia.org/wiki/YAML):

| Type                          | Prefix   | Suffix |
| ----------------------------- | -------- | ------ |
| U32 (32 bit unsigned integer) | !uint32  | ul     |
| U64 (64 bit unsigned integer) | !uint64  | UL     |
| I64 (64 bit signed integer)   | !!int    |        |
| String                        | !!str    |        |
| Hash (256-bit hash value)     | !hash    |        |
| Lock                          | !address |        |
| PublicKey                     | !pk      |        |