{
  "manageEntity": {
    "action": "Save",
    "entityId": "405274952",
    "entityType": "Track",
    "nonce": "0x8b2a24d19cf15e8e46ede7de5b01490356481e8d688e5c06f21645468b56a8e5",
    "signature": "0xf5bebab8cf89cf5f9d55542c51a3098c13c097ef72e5ee8c37813f578a37483924f90eccfc9a497e5e1993e8978b5f1e2f0cf5114e3230767f92149d807cfd391b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}