{
  "manageEntity": {
    "action": "Save",
    "entityId": "816578415",
    "entityType": "Track",
    "nonce": "0xa3ecf1106b0b4faa0f8f324ea99676c6bc9113bb1f3b94c18fdd7ff7d438e17b",
    "signature": "0xbc651111399997d67d0b96be68da5630aa2fd3f03e7bbab4c098cc91aad6b34d54e767b02a864fee2e5c4226b7e6776138ec731bd91c818b548aad9de8963daa1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}