{
  "manageEntity": {
    "action": "Save",
    "entityId": "250937",
    "entityType": "Track",
    "nonce": "0x6c5e780b0193204372a2788ab1b02d0e4b2213eb9e4398dfb07665e26909f5a6",
    "signature": "0x5eced4e2ea8be92454c5199af1131b1758e6e117494d7ec36986e893431d41a46dd4eb8287d922f2c0afcae23b01169caefa699760ebcab99f57a72cdf6273661c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}