{
  "manageEntity": {
    "action": "Save",
    "entityId": "379991482",
    "entityType": "Track",
    "nonce": "0x574801b0a6ba74acee9a7f9727456e5588574dfd5a2483ada97b0af3770d623b",
    "signature": "0xa9849a4d2cbfbb509d7364ef94b24b4a7bc4168e2ee1f0f10260d091a449582b43760a7634cc39ee6ec557991d7bf9b5dab8b2d876e563f6c61eb394669ed7781b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}