{
  "manageEntity": {
    "action": "Save",
    "entityId": "604372703",
    "entityType": "Track",
    "nonce": "0xe00ac42a955801a4390fafe757267a29f170a40e1b9603ff7d22a25196cae073",
    "signature": "0xc533ded7b256e78e308cf839746c9c1ece70153b1b7c0f3ed6ce68c7d63825053d82b389da102ed8a0d5d685a94f1b9be341298f24b5ed821b4ed21373153f741b",
    "signer": "0x4B9F6393F7DB4995E29bc601eE2D8037Ec63a9D1",
    "userId": "163718009"
  }
}