{
  "manageEntity": {
    "action": "Save",
    "entityId": "2138201258",
    "entityType": "Track",
    "nonce": "0x4f90c9ca0b51bb80a1be3a13a4707c113a765c3693f77e1095c4b9dec6bcfc02",
    "signature": "0xb54bf573e583e9bdadb9f9c08c0dd922fcece3feb508f9f92d1427cd0cd12df9749e131bb413f539219be1910336a3a697f2109ccf33049d330b50c41262aebe1b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}