{
  "manageEntity": {
    "action": "Save",
    "entityId": "1424379453",
    "entityType": "Track",
    "nonce": "0xc8e3a22d1b586a7e02dc5122724e1bbdcf9492fb78cc296b536106390ca56f33",
    "signature": "0x383581ca4736aa0a5abb309c80f57f8d64e9033e852072b1227fcd58a48baa1a7643a6a496cd0a687dd39dbff1394ba7899c0b002a76f23128a4f4c6906f92871c",
    "signer": "0xB9861DDCe7453beBD84F71018262415682CCe89e",
    "userId": "360658655"
  }
}