{
  "manageEntity": {
    "action": "Save",
    "entityId": "647249393",
    "entityType": "Track",
    "nonce": "0xda04de463726d595484adc3e135dff7cc142c50970662bd924084f9995d8c5e7",
    "signature": "0x37a2f864fe42d34d2dc3566a101f4b9064e55e7f2d4cb9729de52506b447499b007c86da89a0488f6546a85c5231a19d8e4b9455e8be3ca0780dfc04af32422b1c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}