{
  "manageEntity": {
    "action": "Save",
    "entityId": "620470405",
    "entityType": "Track",
    "nonce": "0x8d93717b4578ada25f8cf82983b38d3fe8f06b0a8766dc61d20f199c5e7ba3e0",
    "signature": "0xc4da8993ddf2fa68768eb9fca605e1d2c48f61404235279760047e7662fb9b260ff16a931a6eebe56d2ec6c8d330328ef98f702124ee9b7f77101b6f34f2aca91c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}