{
  "manageEntity": {
    "action": "Save",
    "entityId": "864714499",
    "entityType": "Track",
    "nonce": "0x11500c39502b78978363ac9aa68518c6759bb1d03133a4cd909f78e3e8280ceb",
    "signature": "0x2ce16affa09132a385ae14eeda166b335c286d43aa0dcb49e5ec138268d829c307ee268bdd62b7b0ca050725bea4167b78e0225a8538d758e3bc18fcca37baee1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}