{
  "manageEntity": {
    "action": "Save",
    "entityId": "61938",
    "entityType": "Track",
    "nonce": "0x53997bf3ef21e2390098276617f2ad2d8cb37edcece732562734905472949e5e",
    "signature": "0xe669fca288be388e6bca00876cba7ab7485e8d3e349cea2aa1a1b97a40ca32ba58f396fb39afbf1814a14ffd7f0925dd8945357d88bbb6a2aff1b09bfd151edd1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}