{
  "manageEntity": {
    "action": "Save",
    "entityId": "655641831",
    "entityType": "Track",
    "nonce": "0x9bb3225bd0eb986c933ed042bae155d7dc082b828732669853b819934bc9852b",
    "signature": "0x5eda5587452625dc4f592e47964dcf9155d261e7bc56530c727e968b833f6443721db8100e32bcbcfd353f42edeb616e0d096d165de57c4bcd8310508c89624f1c",
    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}