{
  "manageEntity": {
    "action": "Save",
    "entityId": "522249",
    "entityType": "Track",
    "nonce": "0x66d6d7a09ca79c29d8ff755158d52dd92f85380511ee7b92521d3ad53476648b",
    "signature": "0xb784a193b6b14ce4f5a8fe920f39118a400a39f899ebfd7253aa2ac9bcf5552723d12b3589904b060d3b7c00ec6ec9fc1b2cb9eba66882276b4b416848b515df1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}