pset: mask pegin/issuance flags out of the input outpoint - #293
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The pegin and issuance flags are stored in the high bits of the PSET `previous_output_index`, but they are not part of the outpoint itself: Elements Core keeps them separate in memory and only re-adds them when serializing. `Input::issuance_ids` was computing the asset entropy over the flagged index, so any new issuance round-tripped through a PSET derived different asset and token IDs than `TxIn::issuance_ids` and than Elements Core does. Those IDs also feed the blinding code. `extract_tx` already masked the flags, but did so inline. Add `Input::previous_outpoint`, which strips them (leaving the all-1's coinbase index alone, as it carries no flags), and use it from both places so the two cannot drift apart again. Also replace the bare `1 << 30` / `1 << 31` literals with named constants. Fixes ElementsProject#292
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The pegin and issuance flags are stored in the high bits of the PSET
previous_output_index, but they are not part of the outpoint itself: Elements Core keeps them separate in memory and only re-adds them when serializing.Input::issuance_idswas computing the asset entropy over the flagged index, so any new issuance round-tripped through a PSET derived different asset and token IDs than Elements does.extract_txalready masked the flags, but did so inline. AddInput::previous_outpoint, which strips them (leaving the all-1's coinbase index alone, as it carries no flags), and use it from both places so the two cannot drift apart again. Also replace the bare1 << 30/1 << 31literals with named constants.Fixes #292