[ZIP 318]: Scale duration parameters for the NU7 block spacing change
ZIP 318 states its scheduling parameters as block counts, assuming 75-second blocks. ZIP 218 reduces the block target spacing to 25 seconds at NU7. Without a change, a migration scheduled after NU7 would run in a third of its intended time, with 1-hour anchor buckets and 10–20 days of transaction validity. ZIP 218 recommends scaling by NU7PoWTargetSpacingRatio any block-count constant that represents a duration. This PR applies that recommendation to ZIP 318. Changes Reference blocks. A new term for a block at the 75-second spacing.
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ZIPs
Zcash Improvement Proposals
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- Original source
[ZIP 312] Specify key generation, change randomizer handling
Changes to randomizer handling after I realized that it couldn't possibly be generated using the message as an input. It does simplify things too. Some additional fixes (using "Re-Randomized FROST" consistently; updating Owners) fixes #1051 Referenced issue #1051: [ZIP 312] Complete the specification for FROST key generation. This needs to be compatible with quantum resilience.
- Original source
NU7: ZIP 218 rounding lowers the supply cap that ZIP 237 claims to keep
Found by @str4d. ZIP 218 sets the post-NU7 subsidy to floor(MaxBlockSubsidy / (2·3·2^Halving)), so three 25-second blocks pay up to 2 zatoshi less than one 75-second block. ZIP 218 states the resulting shortfall from MAX_MONEY: 0.6720 + (H_3 − A)/10^8 ZEC, of which 0.1848 ZEC predates NU7. ZIP 237 reissues only the NSM Value Balance: pre-NU6 unclaimed value plus removed funds. The rounding loss never enters it, so Mainnet issuance converges to MAX_MONEY minus 67,200,000 + (4,406,400 − A) zatoshi, where A is the NU7 activation height.
- Original source
More NU7 ZIP fixes
Proposal 1403 is tracked from its source repository.