{
  "manageEntity": {
    "action": "Save",
    "entityId": "897622046",
    "entityType": "Track",
    "nonce": "0xd6f0e2818d24fabc4ea44612f87741b232ae48c64a758a276a25bf07fbce025f",
    "signature": "0xd08c20ec47b637a84454248fbd37620cc8bddec40e4c86116bbfdff15c14af3c11256d3baf9663d0129eab109a9067ffc2cc999c3115e74b75608da3463346a31b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}