{
  "manageEntity": {
    "action": "Save",
    "entityId": "727291364",
    "entityType": "Track",
    "nonce": "0x1b1e098bf7de0a1a7642402eeaf68db650217815da83704c92b1dd7746d2b3d6",
    "signature": "0xd33e556070b9860451e758dd09fa0343721a4ed0ad6c5151f90ef8fcbba1ae790fcdc8b240cf472fbd034269a3ffd35bd02a7a65a231ff9bdd09509bbf8a3aa91b",
    "signer": "0x767f09338Ac6CE8645c0a76a17a560429b582132",
    "userId": "520958130"
  }
}