4e3af5162f
For our relative locktime API, we are going to want to take differences of arbitrary MTPs in order to check whether they meet some relative timelock threshold. However, the `locktime::absolute::Mtp` type can only represent MTPs that exceed 500 million. In practice this is a non-issue; by consensus MTPs must be monotonic and every real chain (even test chains) have initial real MTPs well above 500 million, which as a UNIX timestamp corresponds to November 5, 1985. But in theory this is a big problem: if we were to treat relative MTPs as "differences of absolute-timelock MTPs" then we will be unable to construct relative timelocks on chains with weird timestamps (and on legitimate chains, we'd have .unwrap()s everywhere that would be hard to justify). But we need to treat them as a "difference of MTPs" in *some* sense, because otherwise they'd be very hard to construct. |
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