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# Replace nodes in subnet 4zbus

Motivation: 
 - replacing dead node nxayg-zna42-zpngn-tg6hw-heplm-xvfsb-bxyov-3qiix-aaavl-5pdev-uqe
 - replacing node 75run-c7fya-7uoor-jzgtx-pwjc4-lfhyp-62p2w-2pnyv-amqh6-tdhji-rae to optimize network topology

Replacing additional 1 node optimizes topology based on the number of nodes controlled by dominant Country actors: value changes from 6 to 5.
Note: the heuristic for node replacement relies not only on the Nakamoto coefficient but also on other factors that iteratively optimize network topology.
Due to this, Nakamoto coefficients may not directly increase in every node replacement proposal.
Code for comparing decentralization of two candidate subnet topologies is at:
https://github.com/dfinity/dre/blob/79066127f58c852eaf4adda11610e815a426878c/rs/decentralization/src/nakamoto/mod.rs#L342

NOTE: The information below is provided for your convenience. Please independently verify the decentralization changes rather than relying solely on this summary.

```
Decentralization score changes for subnet 4zbus-z2bmt-ilreg-xakz4-6tyre-hsqj4-slb4g-zjwqo-snjcc-iqphi-3qe:

[2m    node_provider: 5.00 -> 5.00    (+0%)[0m
[2m      data_center: 5.00 -> 5.00    (+0%)[0m
[2mdata_center_owner: 5.00 -> 5.00    (+0%)[0m
[2m             city: 5.00 -> 5.00    (+0%)[0m
[2m          country: 2.00 -> 2.00    (+0%)[0m
[2m        continent: 1.00 -> 1.00    (+0%)[0m

[1;2m	Total: 3.83 -> 3.83  (+0%)[0m

Nodes removed:
 --> nxayg-zna42-zpngn-tg6hw-heplm-xvfsb-bxyov-3qiix-aaavl-5pdev-uqe [selected based on health: dead]
 --> 75run-c7fya-7uoor-jzgtx-pwjc4-lfhyp-62p2w-2pnyv-amqh6-tdhji-rae [selected based on the average log2 of Nakamoto Coefficients across all features]

Nodes added:
 ++> ktqjk-r6yho-cqgxd-qaqqn-yhxvl-ez6ax-jk3n4-bfa2f-vprkh-eigf5-5qe [selected based on the average log2 of Nakamoto Coefficients across all features]
 ++> 2h6dm-k5h3n-nmqek-m5gty-yy3xq-a3atf-54its-biy25-ijh3c-xvit4-mae [selected based on the number of different NP actors: value changes from 12 to 13]


    node_provider                                                              data_center            data_center_owner             city                        country            continent       
    -------------                                                              -----------            -----------------             ----                        -------            ---------       
    3oqw6-vmpk2-mlwlx-52z5x-e3p7u-fjlcw-yxc34-lf2zq-6ub2f-v63hk-lae       1    at2               1    Anonstake                1    Brussels Capital       1    BE            1    Asia           2
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe       1    br2               1    AtlasEdge                1    Bucuresti              1    CA       0 -> 1    Europe         7
    6r5lw-l7db7-uwixn-iw5en-yy55y-ilbtq-e6gcv-g22r2-j3g6q-y37jk-jqe       1    bu1               1    Cyxtera             0 -> 1    California        1 -> 0    CH            2    North America  4
    7at4h-nhtvt-a4s55-jigss-wr2ha-ysxkn-e6w7x-7ggnm-qd3d5-ry66r-cae  0 -> 1    fm1          1 -> 0    Datasite                 1    Florida                1    ES            1                    
    7ryes-jnj73-bsyu4-lo6h7-lbxk5-x4ien-lylws-5qwzl-hxd5f-xjh3w-mqe       1    ge2               1    Digital Realty           1    Geneva                 1    JP            1                    
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       1    jv1               1    Equinix                  1    Georgia                1    RO            1                    
    eipr5-izbom-neyqh-s3ec2-52eww-cyfpg-qfomg-3dpwj-4pffh-34xcu-7qe       1    lj2               1    Flexential               1    Ljubljana              1    SE            1                    
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae       1    ma3               1    Green.ch                 1    Madrid                 1    SG            1                    
    kos24-5xact-6aror-uofg2-tnvt6-dq3bk-c2c5z-jtptt-jbqvc-lmegy-qae       1    pl1               1    Hurricane Electric  1 -> 0    Ontario           0 -> 1    SI            1                    
    ou3o7-akyjc-ldwd5-anyjn-l2buz-cwhbg-nehlc-abkde-qtc7w-fozdi-hae  1 -> 0    sg1               1    IPCore                   1    Oregon                 1    US       4 -> 3                    
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae       1    sh1               1    M247                     1    Singapore              1                                       
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae       1    to2          0 -> 1    SafeHost                 1    Stockholm              1                                       
    sma3p-ivkif-hz7nu-ngmvq-ibnjg-nubke-zf6gh-wbnfc-2dlng-l3die-zqe       1    ty1          0 -> 1    Telin                    1    Tokyo                  1                                       
    spp3m-vawt7-3gyh6-pjz5d-6zidf-up3qb-yte62-otexv-vfpqg-n6awf-lqe       1    ty3          1 -> 0    Tierpoint                1    Zurich                 1                                       
                                                                               zh5               1                                                                                                 


```


Replace nodes in subnet 4zbus