{
  "manageEntity": {
    "action": "Save",
    "entityId": "892558779",
    "entityType": "Track",
    "nonce": "0x9b3e69fe6d8247e959c94fd686ebe535b83744f1ae1b0430f0efcc1b5056ae5f",
    "signature": "0x2c1512c93b91555f6067d77403353542bc5982cfcbc7b1337b1e0af04a0112911c8d90d7f02e2e04c573f3fb85a87ee4dc0bd9adccbf01f91ff2893b099e080b1b",
    "signer": "0x750EF622E4d51621f31546869CaF7323fF5866c4",
    "userId": "42102047"
  }
}