{
  "manageEntity": {
    "action": "Save",
    "entityId": "1875491134",
    "entityType": "Track",
    "nonce": "0xaf4f80fc6b3e7101d2be51dbda12b00e8f91ab57e5c801fcd97cf1fa854c11b7",
    "signature": "0x44602de46f610e219ecd18cb8d5ec0ae841af1598776cf8de4c688d283cbd1c368d6e23ca5f6b89b5267f964cadde2978d580813d8955c4dfb906172feb5bd6a1c",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}