SignupChallenge

Fields

Field	Type	Description
challenge *	string
algorithm *	string
difficulty_bits *	integer
expires_at *	string (date-time)

* always present

Example

{
  "challenge": "string",
  "algorithm": "string",
  "difficulty_bits": 1,
  "expires_at": "2026-10-22T13:05:00Z"
}

Used by

• Get a proof-of-work challenge