{
  "manageEntity": {
    "action": "Save",
    "entityId": "541123",
    "entityType": "Track",
    "nonce": "0xb7bbebbb32564a1af0a2ef977507f024c1ace3ec3b1aeccdbe68542afa3d6741",
    "signature": "0x9b89c58073152ba03c192a94f7ccfff325294441c255ce8feb8db91b7f013e833176f30a174a7b0ee19156d2435b061a83193e02c8ddd2160530b2f30b2aab751c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}