{
  "manageEntity": {
    "action": "Save",
    "entityId": "393876520",
    "entityType": "Track",
    "nonce": "0xc6da5818e401a25310a91d557b9c10419b6ef18b1b3cd2250cfcff9ae73a8774",
    "signature": "0x8143460400969a00db05608cd891f040ee02e5982e1e73ed3a7e678204c808612043fae45151dc3b6011a32bafca7b09e4dbf5d1f253717b72b8d4a1768b05631c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}