{
  "manageEntity": {
    "action": "Save",
    "entityId": "1803755634",
    "entityType": "Track",
    "nonce": "0xeb4d82e8902e776119479e790fa582ade2b9ecc978518b3d2a8e3934eb2c9b56",
    "signature": "0xa4c73119de613f6d9378c00c66b090010bd13db00f5d7da323152bbd8017909d06b7bd68c8535d70ee27210c127dd93d195966e2cbcfffb2749a00ac02510ab21b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}