{
  "manageEntity": {
    "action": "Save",
    "entityId": "321690804",
    "entityType": "Track",
    "nonce": "0x3ddef47f281d3e53cf0cfb55184e9b34ba2b818407ad7bb959519ba536ef7bdc",
    "signature": "0xfe9e4e403415f1434fd78bae922bb256a2a008087e79e007c4495631e0e405a46decb27c9c85bc0f1b090682ebd599184d6ef7208086f1c8fea68be931dc12711b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}