{
  "manageEntity": {
    "action": "Save",
    "entityId": "513008821",
    "entityType": "Track",
    "nonce": "0x3f106e78b64c3cab4c2cf6e2ba4532adf0bd8d7776873c72f53a88badb157e82",
    "signature": "0xdf2603d5b357947e06c34c8a00d2aa161c9e9d810e7cbb77594393402474a2f92454361bfaa4e2ec2917856d12ebf4980465efd17f2944da0febed0bb190ab401b",
    "signer": "0x72d1844BB49347afC0912B6743298568BC02b404",
    "userId": "328108"
  }
}