{
  "manageEntity": {
    "action": "Save",
    "entityId": "406105874",
    "entityType": "Track",
    "nonce": "1785452238734591874",
    "signature": "0xb939008083e89a1fd01e17fbf6545f99e1eeb84c7ea7878130a2c5f1a42aa74551f9769f9ad027e08359e08012b667d8eabc5620e2eb3d4e3149753b133defc41b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}