{
  "manageEntity": {
    "action": "Save",
    "entityId": "1899615736",
    "entityType": "Track",
    "nonce": "0x60276a019bce9a58dc0295ea4eebd721aa8be3d54f091b49c9f4cc9e8d1809b3",
    "signature": "0x65b6d7d51fd4c677f97e4d8ba4892a409acfea747f518bcc3b82b31ad2e901ae5e471676ac78a58786f5cd21114a3631ab8e092fceb906f731ed9537963ba2841b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}