{
  "manageEntity": {
    "action": "Save",
    "entityId": "698149396",
    "entityType": "Track",
    "nonce": "0x67125dcb42c97b17fac351e9600cee4b16954cdf79ae991cbbeadd77754d1dd1",
    "signature": "0x127c922f80d2572ab55dca0c104bef85cec132d03a6478e4b5e5ad823bcadffd7dab7d49155a209042a7b2f0c8df746e590decb6c772ccbbae1312cd1ff665711c",
    "signer": "0x48a006fC89FEf065AAB7A5769519625870833CC6",
    "userId": "128172"
  }
}