{
  "manageEntity": {
    "action": "Save",
    "entityId": "1669777345",
    "entityType": "Track",
    "nonce": "0x447dbd0a3e6e0bb6036c0d1a6b38255c563eea546e6c598fc0528546ec025402",
    "signature": "0x33ddc82acc4413678885e7afc713f164c404743f809ebbeed1ccc6a45b1a65843c770335a3c16ce3847a93d95c049bc7e116ceac566083f9552dd4c17b968efe1c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}