{
  "manageEntity": {
    "action": "Save",
    "entityId": "1509854488",
    "entityType": "Track",
    "nonce": "0x292580a6cc99eb2c6ef400e90dedcdd261dcb4f9e6b2d980fc39c38bd7c32d4c",
    "signature": "0x8c0e9df1baf693afab9896e1c6038c55448124bd0f09cf6ab17e52dcdb337483528f862f265cccd659b03a941fef3b2c9bd91ab4bb7b99ac0d253f50d1b98e571b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}