Ton

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;; Simple wallet smart contract
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() recv_internal(slice in_msg) impure {
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  ;; do nothing for internal messages
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}
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() recv_external(slice in_msg) impure {
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  var signature = in_msg~load_bits(512);
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  var cs = in_msg;
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  int msg_seqno = cs~load_uint(32);
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  var cs2 = begin_parse(get_data());
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  var stored_seqno = cs2~load_uint(32);
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  var public_key = cs2~load_uint(256);
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  cs2.end_parse();
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  throw_unless(33, msg_seqno == stored_seqno);
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  throw_unless(34, check_signature(slice_hash(in_msg), signature, public_key));
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  accept_message();
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  cs~touch();
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  if (cs.slice_refs()) {
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    var mode = cs~load_uint(8);
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    send_raw_message(cs~load_ref(), mode);
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  }
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  cs.end_parse();
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  set_data(begin_cell().store_uint(stored_seqno + 1, 32).store_uint(public_key, 256).end_cell());
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}
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