{
  "manageEntity": {
    "action": "Save",
    "entityId": "350285052",
    "entityType": "Track",
    "nonce": "0xbb219e7c9b38506c6ad425faa6e0ea1c6def93e6d377d9d31c2f57bbf5b136d1",
    "signature": "0xd636e5333934dbe81d058e1d4ef16c3fae5d5e7823f667d8d69f62111e14638027f9ce3fd3dcd36299ae56b065cac6f15ac4e40f2bb222b47edc97b3d4ed36b21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}