{
  "manageEntity": {
    "action": "Save",
    "entityId": "622697543",
    "entityType": "Track",
    "nonce": "0xa8a5c9c7f9a608fb32d2ba9b11f4ff3c413df889c923bc4e5e507acb16a71926",
    "signature": "0x94dded2b06d919a05d90d37b6c1369dbf238ec1991ba91935839b657fd3da6c8383ff3e226399ac614cebb33ad605a0991c8b6b54f9918b555ee644273a7ef001c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}