set hard fork height

README.md

@@ -85,7 +85,7 @@ Wownero uses a fixed-schedule software upgrade (hard fork) mechanism to implemen
 Dates are provided in the format YYYY-MM-DD.
 
 | Software upgrade block height | Date       | Release Name             | Minimum Wownero version | Recommended Wownero version | Details                                                                            |  
-|-------------------------------|------------| ----------------- |-------------------------|-----------------------------| ---------------------------------------------------------------------------------- |
+|-------------------------------|------------|--------------------------|-------------------------|-----------------------------| ---------------------------------------------------------------------------------- |
 | 1                             | 2018-04-01 | Awesome Akita            | v0.1.0.0                | v0.1.0.0                    | Cryptonight variant 1, ringsize >= 8, sorted inputs
 | 69,69                         | 2018-04-24 | Busty Brazzers           | v0.2.0.0                | v0.2.0.0                    | Bulletproofs, LWMA difficulty algorithm, ringsize >= 10, reduce unlock to 4
 | 53,666                        | 2018-10-06 | Cool Cage                | v0.3.0.0                | v0.3.1.3                    | Cryptonight variant 2, LWMA v2, ringsize = 22, MMS
@@ -97,6 +97,7 @@ Dates are provided in the format YYYY-MM-DD.
 | 253,999                       | 2020-10-09 | Illiterate Illuminati    | v0.9.0.0                | v0.9.3.3                    | Dynamic coinbase unlock (up to 1 mo.), Deterministic unlock times, Enforce maximum coinbase amount, show_qr_code wallet command, CLSAG
 | 331,170                       | 2021-07-04 | Junkie Jeff              | v0.10.0.0               | v0.10.2.0                   | Bulletproofs+, Miner Block Header Signing, Vote by Block, Change coinbase unlock time to 1 day, Reset difficulty and switch back to Monero's difficulty algorithm
 | 514,000                       | 2023-04-01 | Kunty Karen              | v0.11.0.0               | v0.11.0.1                   | View tags, fee changes, adjusted dynamic block weight algorithm, multisig security fixes, RPC broadcast node donation sub-address, Limit tx_extra max size to ~1kb, 12-hour difficulty adjustment window
+| 528,888                       | 2023-05-23 | XXXXX                    | v0.12.0.0               | v0.12.0.0                   | Reset difficulty and switch back to Monero's difficulty algorithm
 
 X's indicate that these details have not been determined as of commit date.
 

src/hardforks/hardforks.cpp

@@ -46,6 +46,7 @@ const hardfork_t mainnet_hard_forks[] = {
   { 18, 331170, 0, 1623245591 },
   { 19, 331458, 0, 1624793373 },
   { 20, 514000, 0, 1677222289 },
+  { 21, 528888, 0, 1682878108 },
 };
 // since Wownero starts from v7, added + 6 so that the total number of hard forks = version number
 const size_t num_mainnet_hard_forks = sizeof(mainnet_hard_forks) / sizeof(mainnet_hard_forks[0]);