{
  "manageEntity": {
    "action": "Save",
    "entityId": "663719",
    "entityType": "Track",
    "nonce": "0x5705cca036bc0d4dfc06677529164e1020da9a6b7bf52cbf425c8fa65cd6e212",
    "signature": "0xd49efb680a44eca11b9a17a721ef4580def811ec0ac0927b3e8e5c1541f6e89c5d82722b6708b286bd12f55f1c3385074abaa4dc087a792d9f082a11a0d898231c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}