{
  "manageEntity": {
    "action": "Save",
    "entityId": "544137",
    "entityType": "Track",
    "nonce": "0x0d1a54926c52e5fda4b0c8a59426eeb46827598ce3ab895bc8c2574889fc4e96",
    "signature": "0x954267039fc0161bc29069a505ebaec73f3bdd278368c4a33ba380ab4017ed227f4c0ebc6c13536c2968bf093a8f88a4452708732f31825236c8d6b1de39931a1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}