{
  "manageEntity": {
    "action": "Save",
    "entityId": "544160",
    "entityType": "Track",
    "nonce": "0x3fa6398c67a401e749537b36cae9993d547c8785a07c0d410abb6a0b2d90e0e5",
    "signature": "0x28706b35ff7a58bfe52fec4c4b27206a1efdf9615c6978aff8b6d238f9ceb3260450dd4a1e2d5cbb269681dbc5b30bae32c2e0853ece8fc7ed7da23de0bd6b631b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}