{
  "manageEntity": {
    "action": "Save",
    "entityId": "1894378343",
    "entityType": "Track",
    "nonce": "0xe90e0ee1b0c04d7bb62646f78b524b632a1874c0bc32c9d5acd95545dccb3fa6",
    "signature": "0xa632b54cc9926b850c4cd5d0594e96a0aea4a4f51e3caee16bc37125da5bc3953f26a008f80a7800f28a745d889dfdea7981461e560ce5f7b48c2205900accb91c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}