{
  "manageEntity": {
    "action": "Save",
    "entityId": "909612864",
    "entityType": "Track",
    "nonce": "0x8555ee39d6b86ad3e346cbb41305201dec918a9165bd68a5964bcfa4edfb2bb4",
    "signature": "0x121a8ed4922884fefe8d06279f2f979be3ac05de574bc6140b152d4c0757fb3f6a8cfac8b8abe596bba47da486cee5c98f6bd412aee8353c228fe8b20c5da0c31b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}