{
  "manageEntity": {
    "action": "Unrepost",
    "entityId": "303018406",
    "entityType": "Track",
    "nonce": "0x5327fd87794e2418d0d1b404641591b5f486d8d7e4c2d89be3fd43a90aa39c86",
    "signature": "0xdf7e996f8947688914f4c0e1185ab9f7478b53c31589c2257f033d843487d1813adf43eb45e4824da5a323b823d2eb98a42f6ce8458b7e96448c855eb22bb7a51b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}