{
  "manageEntity": {
    "action": "Save",
    "entityId": "200267546",
    "entityType": "Track",
    "nonce": "0x4731407c0669fa6ea9fa4e95f6102bce107f99c26c3f1a72cb343a29c86d7004",
    "signature": "0x523d2540cd0e1e9721ba9abb42c77d7ddb41c8f4dbb4d0602282e8b6044cc4c03bdf14837ffc8ef5bd68312b618ffeb8ce3273419c05a22733bcd02768fcbd991b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}