mintHandle
Issues a signed handle for a conversation. The browser never names a conversation directly: if it could, a publishable key and a guessed id would be enough to continue someone else’s chat. With signing, a caller can only present handles this gateway issued.
A handle is valid for handleTtl seconds and is signed with the gateway’s secret.
readHandle() verifies one and returns the conversation id.
Parameters
conversationId
The conversation to name. A new random id, prefixed chat-, when omitted or empty.
Returns
string — the handle.