{
  "manageEntity": {
    "action": "Save",
    "entityId": "1904550646",
    "entityType": "Track",
    "nonce": "0xa0c91843c6d7f5831a329b029a457c85744b7bca3192b134deb3822886870ef2",
    "signature": "0x5873020f83c223db6ebfc32252cc5e00c53b029538dbe7a6c835dfe206c9cdfb1dbf855f78615b6dbe35afa61b90e7ac7c52090e599a506cef8e21c527bdf95c1c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}