{
  "manageEntity": {
    "action": "Save",
    "entityId": "747397720",
    "entityType": "Track",
    "nonce": "0x472e7b8fa93a1c372a561710f428256ca787732e597dd98a39b4588e463ec5bb",
    "signature": "0x2e6243b93a39b699275621182f271eab7b1a82c6dc57c5904fecdf2c5adcd1323b4b91958c990b0727b3a220a817114cf6b8f49b7929f82395ab4866a047731e1b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}