{
  "manageEntity": {
    "action": "Save",
    "entityId": "320823",
    "entityType": "Track",
    "nonce": "0x21de29d7607c8a3d12af0ff54bcff1e0c9b36c6c42c15e41cffc2b1ea5bc256f",
    "signature": "0xa97881ff660538baf0af9d517b1d26e46286f39dca5c867fc32d9a7851e621015610cd872b2a468026360b28a53e4c0fd83dee90fa74df19ff6b69e94f5fb00a1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}