SessionKeyPrepareRequest

{
  "x": "0x2f9a…",
  "y": "0x8c41…",
  "expires_at": 1797600000
}

string

required

P-256 public key X coordinate of the browser-held key.

Example:

"0x2f9a…"

string

required

P-256 public key Y coordinate.

Example:

"0x8c41…"

expires_at

number

Requested expiry, Unix seconds. Clamped DOWN to policy — asking for longer returns the ceiling rather than an error.

Example:

1797600000