{
  "manageEntity": {
    "action": "Save",
    "entityId": "379923944",
    "entityType": "Track",
    "nonce": "0x6172a81cb2c69f7b7dd77916a69b544d0a398e813d98b800d3c39664fcdb7cc7",
    "signature": "0x4e84be56875125ff02336a8d6cb3ec642c945ddabc35169372eb3a29436fa1160b539bfc936fc7b6c0827dc43a0adc2ba979f559654c5e89f73b072827e60d2a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}