{
  "manageEntity": {
    "action": "Save",
    "entityId": "1285803970",
    "entityType": "Track",
    "nonce": "0x9c3605d8f932b11a95d143ade570e9efe617c0ee9ff114d43396f5ebdc795c5f",
    "signature": "0x4a1182af49eae59836dbcf8491070e3071e951656d5fa470c48924bb5843d5c2116969f35992582ec41392330e9afe12bf11004baead6f95d56bb10b0a2692871b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}