{
  "manageEntity": {
    "action": "Save",
    "entityId": "290784712",
    "entityType": "Track",
    "nonce": "0xacf0ce88aeb43a72894e3b5bdab5246f0f37641dc51e8778a34e2a771d4a11ce",
    "signature": "0x2baa0161205440326be27755d683540ee3145ee87860c6e21fb370d351518dd026f31632076e0a3c743d30dd35027231a6310ac360ffba1c7b7061cf3c23aff01c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}