{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440724337",
    "entityType": "Track",
    "nonce": "0xb357c0000a5eba32e87ad456d1e08285def9f0c46140e7bb9aa4cd6f61d5b519",
    "signature": "0x623eb8a66a05c46cecd82758bb1d5cca96ff48bdec6a76ee813e4f6049ce951d6c4f17d5078e3b8e70b163d9cfb290fa9df3ada7218d39ea467fb9d061618d6d1c",
    "signer": "0xa4A8a4853051b18e0f0f777693Ce34CF4bCe9385",
    "userId": "634886384"
  }
}