Module body 

The /exchange body, keys in the official Python SDK’s order. The venue reads it as JSON, so only the action’s own key order reaches a hash.

Functions

l1

user_signed plus "vaultAddress", an explicit null unless the action acts for a vault or subaccount, for an L1 action.

user_signed

{"action":..,"nonce":..,"signature":{r,s,v}}, for a user-signed action.