{
  "manageEntity": {
    "action": "Save",
    "entityId": "1961806839",
    "entityType": "Track",
    "nonce": "0x3dd17b18711bc1d98e0065352ad2f426c0f3bb9f0b3af51f3607bf442a0cbc48",
    "signature": "0xc38fe3fb96f85eb649f167b420dfd159367ab77923ec78181613190d0383bce744b4a072f1a89d17797e7812cb135b4d2e0d0c7196b57fcbd36b7500a2e778b81b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}