{
  "manageEntity": {
    "action": "Save",
    "entityId": "1975417345",
    "entityType": "Track",
    "nonce": "0x219f501974a229b99c09d427a5f8e760ca533d79319f2deb99f671f0b677c9e1",
    "signature": "0xc5790eda9095ceca3ece64ad8075763071a690b24e5e9def977b8378544307b034d3f580f968a31770b11bce67217fcbff4c02f2ac49bf17d6b7b5b15782f57a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}