{
  "manageEntity": {
    "action": "Save",
    "entityId": "1289145047",
    "entityType": "Track",
    "nonce": "1790167216131652778",
    "signature": "0xd81c52eba8568eccf9d70a3022a4ce8ddbee78884058515e52669bfdc4e657e83d13a21d779141f08ff96364a28ec5badd5851d620f68fbe55768c8b199fdf561b",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}