{
  "manageEntity": {
    "action": "Save",
    "entityId": "150208200",
    "entityType": "Track",
    "nonce": "0x9fdd2a42c575e47514292a2bc162425b554e29281eb6d43b4baa637cfb56159e",
    "signature": "0xf98b21354b89a6a01f973908020a51d242253ee912bd04061243af15286aebf63fb8d0105ef26969678ce9e4e1546f134fe5b38378e64f78046eecdd67f39d5f1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}