{
  "manageEntity": {
    "action": "Save",
    "entityId": "216613015",
    "entityType": "Track",
    "nonce": "0x4c1f11ca69892e88ce588a1694a40976a5001c9b4d6b3cce3faea0958593844f",
    "signature": "0x1651c19aaf4e9263fae75253f73779fa78bcabfe7f339d166a43b4e8cda1fe021ea54df06647e067e9c7c30090ecddf35fc8ac0ef61eb8bde19f273f29acb4ce1b",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}