{
  "manageEntity": {
    "action": "Save",
    "entityId": "670709348",
    "entityType": "Track",
    "nonce": "0x60ab5b15aa4f71844a2833bd0fc57bff543b125ce93bdb15998aef62cea8dd5a",
    "signature": "0xa815505f214513d949264f4056cc58af999274b7b5ebddc2f328985417c87bf1449ad96f0b5217d215c7fbc66ea990443fa6fc9dc61b6412b0b6ae04916e65f91c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}