{
  "manageEntity": {
    "action": "Save",
    "entityId": "511554",
    "entityType": "Track",
    "nonce": "0x8fabc4cc844ccd6b0d295ea829bbea87dce0e117bb0a7e2f6122dd5677c966ea",
    "signature": "0xa5f6f1bf0526f9048a792983d427d49593878242691890045e5f9da7c329378c0d5b2171e1dcae7c820a4dbd3c65a3315b0480a9137f5ef5b4c279471f4cd4691b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}