{
  "manageEntity": {
    "action": "Save",
    "entityId": "1403915772",
    "entityType": "Track",
    "nonce": "0x0addb6043c117ee59f1ca0e173e45ca6e4df4295635f1a0bd49a726bd41f4bc3",
    "signature": "0x73b0c7d1ff047df4e19efeb1b490932fc040795da2add0c605415246e5bc422d245224edb91502d731faa8bd39f7edc3ec119bc6280e34505c270fb07d852e8d1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}