LGPLv2

/*
    This file is part of GRAM Blockchain Library.

    GRAM Blockchain Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    GRAM Blockchain Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with GRAM Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2017-2020 GRAM core developers
*/