serai/docs/integrations/Monero.md

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# Monero
### Addresses
Monero addresses are structs, defined as follows:
- `kind`: Enum {
Standard,
Subaddress,
Featured { flags: u8 }
}
- `spend`: [u8; 32]
- `view`: [u8; 32]
Integrated addresses are not supported due to only being able to send to one
per Monero transaction. Supporting them would add a level of complexity
to Serai which isn't worth it.
This definition of Featured Addresses is non-standard since the flags are
represented by a u8, not a VarInt. Currently, only half of the bits are used,
with no further planned features. Accordingly, it should be fine to fix its
size. If needed, another enum entry for a 2-byte flags Featured Address could be
added.
This definition is also non-standard by not having a Payment ID field. This is
per not supporting integrated addresses.
### In Instructions
Monero In Instructions are present via `tx.extra`, specifically via inclusion
in a `TX_EXTRA_NONCE` tag. The tag is followed by the VarInt length of its
contents, and then additionally marked by a byte `127`. The following data is
limited to 254 bytes.
### Out Instructions
Out Instructions ignore `data`.