{
  "manageEntity": {
    "action": "Save",
    "entityId": "860487",
    "entityType": "Track",
    "nonce": "0xcafe2cf81e11f04808c8b615cdc0bf139b3e489b1cd577a307cc847f72869e51",
    "signature": "0xb56f77cd5778e5a8b4a20b8bd813d3023eacc8fe44225edb9ffbc73d0103f5f7202e47637c68073c0aca03482ee26bc20b9376becf05865b61be798c95d8da531c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}