{
  "manageEntity": {
    "action": "Save",
    "entityId": "1808346512",
    "entityType": "Track",
    "nonce": "0x523b79f809c991b399515b7ec3e1dfd171da1d38638a0735fd2a662fddee58f4",
    "signature": "0xbcd52ae2cd79505a79505859dd40ecf912257916ede8f4e3d45fe35039caee954b1bb4e7139ba11b29da8a14a7094ec7030eb37ad84911e8edf91dc4b9359dea1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}