{
  "manageEntity": {
    "action": "Save",
    "entityId": "559286",
    "entityType": "Track",
    "nonce": "0xdf440f47551f6fdb6033560aaa8493fd1752f46dedf85e10246f96c391df0c7f",
    "signature": "0x3784e593f6254c92266b452063bc4660f1286848f0d08f0d601dfd2c6a37128f37790edb95630f5f393f532c87956cf69ce337ecf40e07fae9f0a4fd9859a2b71c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}