{
  "manageEntity": {
    "action": "Save",
    "entityId": "285949",
    "entityType": "Track",
    "nonce": "0x0187ae49986cd3c328002117db1d5e1a42837f1469a3deb2de0f24abd8f5dc34",
    "signature": "0x7a8dd53cad0ad0ea209f6f96c09bc6c86de79e1be6ec34fc389217889f1ceca331e345fcd283130e50cddae6d25827687aecf0f81dcd57ed9fba781f379457db1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}