{
  "manageEntity": {
    "action": "Save",
    "entityId": "385683",
    "entityType": "Track",
    "nonce": "0x5892cd95b8f83a7627e07ff8ae9c30bc15407ee352ca296884cb7101c3ccc6f8",
    "signature": "0x7ed21c40042aabd82f8475cb16813d19f42f374a6a1f2fbff7ba5c9bc19458c63219e1a786da120a60f9d01a8e8f13b5a1aa04ecb57131188c66b37bb39964b81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}