{
  "manageEntity": {
    "action": "Save",
    "entityId": "1878955720",
    "entityType": "Track",
    "nonce": "0x541e8daf338e4d273b828eae11f3dad3e87fe96dfbd9b0c17234522a3be7af2d",
    "signature": "0xc31aeaaf8b98a6f3d516eb17f561f11a7dd7e5a2351c042830d653873f8a9da021c11ad580928120b9af5c89db2f3325ead47dcda9b6f06f2ba5f0a5cde3965f1b",
    "signer": "0xD71D6a61b797d5436c8d291306fd7DbCe6257Cc2",
    "userId": "117522"
  }
}