{
  "manageEntity": {
    "action": "Save",
    "entityId": "675991",
    "entityType": "Track",
    "nonce": "0xb660505de054b1f4b91a3957db368d677237a6e3e95bab99079bb54adbf7ecb9",
    "signature": "0x74b8b871fb92f6ccd9df42866966ba1cd7846ce90ef63f9c3addf57d72eda5541843effddfc09952dfa7f60e944a3179f96c42261cd815ea17782572955268c21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}