{
  "manageEntity": {
    "action": "Save",
    "entityId": "491500313",
    "entityType": "Track",
    "nonce": "0x625d03539db8ed961d2d80f491647000a5fece3684e750c0e7bb8c2434a9aeee",
    "signature": "0xd81fc0a7322721f9e5217523617e1ade876e220ebc45d2d2b1b98234bcc74ee5075a427a373420a699f9cb03de783568203263d78732286b8ab8e131b0a1304c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}