{
  "manageEntity": {
    "action": "Save",
    "entityId": "1540149669",
    "entityType": "Track",
    "nonce": "0x8386a853a03c8ba561010533255c7fd7dc033c8345b978bbd7866f6a21b340a7",
    "signature": "0xcbe004b56575879f18ba24f47670b5333ef687348f7a9e141450487dda7a6ec41b301963a4c8eda98a22a2dbc77bf80a761cd0bd4179b754a74b6dd145cd51cb1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}