POST /acme/new-account HTTP/1.1
Host: example.com
Content-Type: application/jose+json

{
  "protected": base64url({
    "alg": "ES256",
    "jwk": {...
    },
    "nonce": "6S8IqOGY7eL2lsGoTZYifg",
    "url": "https://example.com/acme/new-account"
  }),
  "payload": base64url({
    "termsOfServiceAgreed": true,
    "contact": [
      "mailto:cert-admin@example.org",
      "mailto:admin@example.org"
    ]
  }),
  "signature": "RZPOnYoPs1PhjszF...-nh6X1qtOFPB519I"
}