{
  "manageEntity": {
    "action": "Save",
    "entityId": "293476",
    "entityType": "Track",
    "nonce": "0x70f7f223b410fc7be62b7b278f2ae15ffb382e0a149b1f260e2221b05c5f37ac",
    "signature": "0xc3d85add8d55094b3d5dad221c4bcac7ea7bd79e020630c412d31f42dbe3cf085d4b11085836cbae4e569e84834f38963397d026c9029ade2abaceaebd9c911b1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}