{
  "manageEntity": {
    "action": "Save",
    "entityId": "1302192495",
    "entityType": "Track",
    "nonce": "0x21f66c9d6151933f2076a14ee420a93e8637bf2b1b93a77f472af48fb7c29724",
    "signature": "0x57a4f74479cd02cd99a265168a173ae95ed418c8b1be5dd162af46ccbf13cb16146c8ca887bfb0659b7a942b47ceba6cdd8630d35cafee7791a51761e6af9c0a1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}