{
  "manageEntity": {
    "action": "Save",
    "entityId": "774771173",
    "entityType": "Track",
    "nonce": "0x21a817f3bfb93a04ed328162a98158ce2b7747cec75402afc555dae6f3d9d8f2",
    "signature": "0x0c5210559a814f32df97f110294c996d069445430865d7ac542f538d20f366b712c8f8a03693264e7ecdf3d21641cc4852c95141af17dfb12cdb1ac5f9a02dec1b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}