{
  "manageEntity": {
    "action": "Save",
    "entityId": "300643635",
    "entityType": "Track",
    "nonce": "0xea19499a668737d45d451a6942b9d89535282125e4af3eceae3b2e29855af1e8",
    "signature": "0xc8171e23fe12ed2211f7e7e8dcc8ccd2f09d56806f864fd88b326687163d4f79770520ae080010b23cf174d61c218e2dfc09a8a2ca4264f4adec06bc46ad4e3b1b",
    "signer": "0x3324C23609BC25902C39CFa38CF40581c7Bc7F87",
    "userId": "229134011"
  }
}