{
  "manageEntity": {
    "action": "Save",
    "entityId": "521386606",
    "entityType": "Track",
    "nonce": "0x480193960deb7fa35d34fb386e2bf17fcedaeace92494bf446a1436a3d0cb752",
    "signature": "0x2e61110732405db3f254a74da5cc677e2a36381d7acceddc0b49bf6add139c896e1ab7ac146a4ac90e72190b1f7bb5af9789694d2a0a221aadae87a5b27189bc1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}