{
  "manageEntity": {
    "action": "Save",
    "entityId": "719749",
    "entityType": "Track",
    "nonce": "0x86d4e8fef0554825133fa8d18fdfb25543c4f1935a748aead91ae38290ce1c14",
    "signature": "0xab82c1fbe4967b04d03a3de5829c5a769ef6667d5e78f16f67638d9ada48e9b35cd9aa4720f82fe28ebd5ee30d5be0b72a32ff332a3dd7fc3593a8115fe290d21b",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}