{
  "manageEntity": {
    "action": "Save",
    "entityId": "648904",
    "entityType": "Track",
    "nonce": "0x5a4bce6a71ce237c82d92c3cbcaca8e9bc06ff44c9a352b64d358398e8de154c",
    "signature": "0x307786c4083106b581db49cdc573d843daab2721f0e0b7ab8c3a3c366ff752d1661750d89805b5250c6daafeb60ade6472886730873762edd046367d4effd6db1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}