{
  "manageEntity": {
    "action": "Save",
    "entityId": "812773248",
    "entityType": "Track",
    "nonce": "0x727bbf239738e2cfb8c57a6daf78ef2a260c560904f0295847264143d9299687",
    "signature": "0x73eccc3e3b79dcee2edf90506a3bf17dbaf05da3138425833304e53e2ff04c5c774e00e0e4d4fdb26a1fa54b34b095d3bb73af6a47817fc4b259c38c3f7693281b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}