{
  "manageEntity": {
    "action": "Save",
    "entityId": "454644",
    "entityType": "Track",
    "nonce": "0xf60712093fc2d89e8e06e787a53316c917926121614d57585e6e487329ab2fcf",
    "signature": "0xb3590b558a9b165aa6d7e31df0135ccd4ce1114df2b21b6743a531777ba34bf200cac90249e45950a5c278c0967fc8aa429504b4057035baedf313f5924cba721c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}