{
  "manageEntity": {
    "action": "Save",
    "entityId": "664726",
    "entityType": "Track",
    "nonce": "0x74c33035fae6ea9c8213dc6dbc297e0d4ddd1bf9b3b3d0988fa849d7e2c7d5ad",
    "signature": "0xb9c0cf419bdebcc1e3ba7d460a96fcce1d7f81a99f6bde3f24e945a1fe0dff633752030f9f50c331853c409a70c740c6934f35d917cd7366c661a81412fde0111c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}