{
  "manageEntity": {
    "action": "Save",
    "entityId": "177296129",
    "entityType": "Track",
    "nonce": "0x958e997499070e335cc1265ac90b07b50ba1ea5ebe3fe84e8bbe3463dada4ff4",
    "signature": "0x3133de1baefeedccd62d38cf8994c294b60c1d2392d9bef12bfdd52c09530891444f373c0a30ab6b4ef14f54be3aad5191631f44a0f56b30614c403198cb357e1b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}