{
  "manageEntity": {
    "action": "Save",
    "entityId": "288766225",
    "entityType": "Track",
    "nonce": "0xd8821a9de872f0f9a21a9c4d4de0127fa18c12f2af418548db09ff360bd13b10",
    "signature": "0xbc565d38902ede42de20b9ef56b9550256b2b807bd0bb2080da5e61b210433cd1880b19e45bd12f71be3914a6770f17f26f69cd03208675bd05aa9f52a64e1341b",
    "signer": "0xB60638A16dB9440769D68556a99A3D24d3F7F26F",
    "userId": "137494"
  }
}