{
  "manageEntity": {
    "action": "Save",
    "entityId": "139492046",
    "entityType": "Track",
    "nonce": "0x7eb69e58ca56ccd8e34db63a73b6393fa5b127aa838c3ff2075e24d0868e875b",
    "signature": "0x28da4ca4fd4a513efbc5bf27f216d9cf2563f4c35bc287cb06a9526dfbbc81102712808f5a02b0c95bfbf99845cad65f73bd411db67f47b1b733a16aa448826b1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}