{
  "manageEntity": {
    "action": "Save",
    "entityId": "428755",
    "entityType": "Track",
    "nonce": "0x241ce9f907a01f845588a68476efc102ea3fd0e96fc128475889272d6ec396a0",
    "signature": "0x1d64c2e21424cec1b78655a70ca06c679dcdf72eed5b47edff99c6bd2f098efa30bc8458438337555dc40f4eb54676bdc087724ec5bd863b9549d409e056c8901b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}