{
  "manageEntity": {
    "action": "Save",
    "entityId": "489614",
    "entityType": "Track",
    "nonce": "0x817da17101c9ec23b171887bcc994ea1993c96abf81b435721d6ea60befd04e9",
    "signature": "0x23a4d12439111bb0f088e9f7f7bb7574f4b6149a928d560da2326913f0dc07da0ca530d7c6df831dbc341b6fcf785288da9a6222f9f8901d7e6697aee402eacb1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}