{
  "manageEntity": {
    "action": "Save",
    "entityId": "1967161557",
    "entityType": "Track",
    "nonce": "0x0f10a85891b2302190baea31bff71ad0f72cf6617eccf4b4c3c48d753fe31e25",
    "signature": "0xa946edd3edbbc382a338888c51ab1920dd965ba7ad8dca075b9ef626437bd5b54abf37cc57965c958f21a1c7e64a7b9e8039536cda7869d32c95507edbc9be331c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}