{
  "manageEntity": {
    "action": "Save",
    "entityId": "206646",
    "entityType": "Track",
    "nonce": "0xdcf5aaf16de57dfcd090b086c92bd0bf799aa3e1fc84c551b8726810d466604a",
    "signature": "0x883409951fc4a0996c411c85be43cd8020675063e41420cd5eb40178931c63067a198e0fc7e99d88137b18561ec03a862333db6214a2a2659cd223629821af451b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}