{
  "manageEntity": {
    "action": "Save",
    "entityId": "1704325819",
    "entityType": "Track",
    "nonce": "0xc1ad3c391dcbcbe72345d0d0f5b5dc584f512ae5ec696dde322ebd147708b4b6",
    "signature": "0x012f6ce204a26fbf483faea06c6b1bfb77b37b8bb46a17c77eb8dc5159f7aba33f5f45aa6bb1ab66fe8c32246e3e31b88e96bcae0ff9b0712c8da05c48d8f0481c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}