{
  "manageEntity": {
    "action": "Save",
    "entityId": "1449377648",
    "entityType": "Track",
    "nonce": "0xab236eda064f1fa958363c9502ee9e1b6053cb1b86ebedc9c5f66ad5dc4381ec",
    "signature": "0xd752aa741b68815b716f68baa028afb2fb7cd3f81dd26db03109ec96925cc01167878dc817766d72d3b970d06debfefc6fdf918020dff0c43585422e4702c90a1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}