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# Replace nodes in subnet uzr34

Motivation: 
 - replacing dead node xetvj-ysqpy-wnnd4-fbytw-n6arq-w7f5e-fhsuo-7xd67-lwpt2-novnx-iae
 - replacing dead node ylm4h-mc2vy-vmwvf-g2qhn-36rbw-5cunq-wpj2j-ttofo-xc27c-vfdh7-aae

Calculated impact on subnet decentralization if replacing:

- 1 additional node: (gets worse) the number of different Country actors decreases from 23 to 22
- 2 additional nodes: equal decentralization across all features

Based on the calculated impact, not replacing additional nodes to improve optimization.

Note: the information below is provided for your convenience. Please independently verify the decentralization changes rather than relying solely on this summary.
Here is [an explaination of how decentralization is currently calculated](https://dfinity.github.io/dre/decentralization.html), 
and there are also [instructions for performing what-if analysis](https://dfinity.github.io/dre/subnet-decentralization-whatif.html) if you are wondering if another node would have improved decentralization more.



Decentralization Nakamoto coefficient changes for subnet `uzr34-akd3s-xrdag-3ql62-ocgoh-ld2ao-tamcv-54e7j-krwgb-2gm4z-oqe`:
```
  node_provider: 10.00 -> 10.00    (+0%)
    data_center: 10.00 -> 10.00    (+0%)
data_center_owner: 9.00 -> 8.00   (-11%)
           city: 10.00 -> 10.00    (+0%)
          country: 6.00 -> 5.00   (-17%)
        continent: 2.00 -> 2.00    (+0%)
```

**Mean Nakamoto comparison:** 7.83 -> 7.50  (-4%)

Overall replacement impact: (gets worse) the average log2 of Nakamoto Coefficients across all features decreases from 2.7868 to 2.7146

# Details


Nodes removed:
- `xetvj-ysqpy-wnnd4-fbytw-n6arq-w7f5e-fhsuo-7xd67-lwpt2-novnx-iae` [health: dead, impact on decentralization: (gets worse) the number of different NP actors decreases from 28 to 27]
- `ylm4h-mc2vy-vmwvf-g2qhn-36rbw-5cunq-wpj2j-ttofo-xc27c-vfdh7-aae` [health: dead, impact on decentralization: (gets worse) the minimum Nakamoto coefficient across all features decreases from 2 to 1]

Nodes added:
- `os2wv-dchv6-fjwdg-nichf-3cra6-wccb3-57glq-xqgen-zwobp-aonve-lqe` [health: healthy, impact on decentralization: (gets better) the minimum Nakamoto coefficient across all features increases from 1 to 2]
- `dyycg-wc45f-jwks2-abddo-m3n5r-o5kxy-g5xhm-7ve4u-3tlk7-i7xec-oae` [health: healthy, impact on decentralization: (gets worse) the average log2 of Nakamoto Coefficients across all features decreases from 2.7585 to 2.7146]


```
    node_provider                                                              data_center            data_center_owner                                    city                             country            continent            
    -------------                                                              -----------            -----------------                                    ----                             -------            ---------            
    4r6qy-tljxg-slziw-zoteo-pboxh-vlctz-hkv2d-7zior-u3pxm-mmuxb-cae       1    an1               1    Africa Data Centres                             1    Bogota                      1    AR            1    Africa              1
    64xe5-tx2s3-4gjmj-pnozr-fejw2-77y5y-rhcjk-glnmx-62brf-qin5q-pqe       1    ar1               1    Central Tower DC                                1    CABA                        1    AU            1    Asia           8 -> 7
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe       1    at1               1    Cloud9                                          1    California                  1    BE            1    Europe              9
    6sq7t-knkul-fko6h-xzvnf-ktbvr-jhx7r-hapzr-kjlek-whugy-zt6ip-xqe       1    bg1               1    CyrusOne                                        1    Colombo                1 -> 0    CA            1    North America  7 -> 8
    7at4h-nhtvt-a4s55-jigss-wr2ha-ysxkn-e6w7x-7ggnm-qd3d5-ry66r-cae       1    bn1               1    Cyxtera                                         1    Flanders                    1    CH            1    Oceania             1
    7uioy-xitfw-yqcko-5gpya-3lpsw-dw7zt-dyyyf-wfqif-jvi76-fdbkg-cqe       1    ch3               1    Datacenter United                               1    Florida                     1    CO            1    South America       2
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       1    cm1          1 -> 0    Datasite                                        1    Gauteng                     1    CR       0 -> 1                         
    dhywe-eouw6-hstpj-ahsnw-xnjxq-cmqks-47mrg-nnncb-3sr5d-rac6m-nae       1    cr1          0 -> 1    Digital Realty                                  1    Georgia                     1    CZ            1                         
    diyay-s4rfq-xnx23-zczwi-nptra-5254n-e4zn6-p7tqe-vqhzr-sd4gd-bqe       1    fm1               1    EdgeUno                                         1    Hesse                       1    DE            1                         
    eatbv-nlydd-n655c-g7j7p-gnmpz-pszdg-6e6et-veobv-ftz2y-4m752-vqe       1    fr2               1    Equinix                                         2    HongKong                    1    EE            1                         
    eybf4-6t6bb-unfb2-h2hhn-rrfi2-cd2vs-phksn-jdmbn-i463m-4lzds-vqe  1 -> 0    hk1               1    Flexential                                      1    Illinois                    1    ES            1                         
    fwnmn-zn7yt-5jaia-fkxlr-dzwyu-keguq-npfxq-mc72w-exeae-n5thj-oae       1    hu1               1    Gasan                                           1    Ljubljana                   1    GE            1                         
    ivf2y-crxj4-y6ewo-un35q-a7pum-wqmbw-pkepy-d6uew-bfmff-g5yxe-eae       1    jb2               1    Ginernet                                        1    Madrid                      1    HK            1                         
    izmhk-lpjum-uo4oy-lviba-yctpc-arg4b-2ywim-vgoiu-gqaj2-gskmw-2qe       1    kr2               1    Hurricane Electric                              1    New Delhi                   1    IL       1 -> 0                         
    otzuu-dldzs-avvu2-qwowd-hdj73-aocy7-lacgi-carzj-m6f2r-ffluy-fae       1    lj1               1    Interhost                                  1 -> 0    Ontario                     1    IN       1 -> 2                         
    qdj4d-76lh3-w2q5i-kwjcd-643pq-pk42d-cziag-4hkau-35gib-m7s33-6qe       1    ma1               1    Marvelous Web3 DC                               1    Panama City                 1    JP            1                         
    r3yjn-kthmg-pfgmb-2fngg-5c7d7-t6kqg-wi37r-j7gy6-iee64-kjdja-jae       1    nd1               1    Master Internet                                 1    Panvel                 0 -> 1    KR            1                         
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae       1    or1               1    NEXTDC                                          1    Queensland                  1    LK       1 -> 0                         
    s5nvr-ipdxf-xg6wd-ofacm-7tl4i-nwjzx-uulum-cugwb-kbpsa-wrsgs-cae       1    pc1               1    Navegalo                                   1 -> 2    San Jose               0 -> 1    PA            1                         
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae       1    pl2          0 -> 1    Nine.Ch                                         1    Seoul                       1    PL            1                         
    sma3p-ivkif-hz7nu-ngmvq-ibnjg-nubke-zf6gh-wbnfc-2dlng-l3die-zqe       1    sc1               1    OrionStellar                               1 -> 0    Singapore                   1    SE            1                         
    sqhxa-h6ili-qkwup-ohzwn-yofnm-vvnp5-kxdhg-saabw-rvua3-xp325-zqe       1    sg2               1    Posita.si                                       1    South Moravian Region       1    SG            1                         
    ucjqj-jmbj3-rs4aq-ekzpw-ltjs3-zrcma-t6r3t-m5wxc-j5yrj-unwoj-mae       1    sh1               1    SyT - Servicios y Telecomunicaciones S.A.       1    Stockholm                   1    SI            1                         
    unqqg-no4b2-vbyad-ytik2-t3vly-3e57q-aje2t-sjb5l-bd4ke-chggn-uqe       1    ta2               1    TRG                                             1    Tallinn                     1    US            5                         
    vegae-c4chr-aetfj-7gzuh-c23sx-u2paz-vmvbn-bcage-pu7lu-mptnn-eqe       1    tb1               1    Telia DC                                        1    Tbilisi                     1    ZA            1                         
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae       1    to1               1    Telin                                           1    Tel Aviv               1 -> 0                                            
    wdnqm-clqti-im5yf-iapio-avjom-kyppl-xuiza-oaz6z-smmts-52wyg-5ae       1    tv1          1 -> 0    Unicom                                          1    Texas                       1                                            
    wwdbq-xuqhf-eydzu-oyl7p-ga565-zm7s7-yrive-ozgsy-zzgh3-qwb3j-cae       1    ty1               1    Yotta                                      0 -> 1    Tokyo                       1                                            
    zy4m7-z5mhs-zfkpl-zlsjl-blrbx-mvvmq-5z4zu-mf7eq-hhv7o-ezfro-3ae  0 -> 1    wa2               1                                                         Warszawa                    1                                            
                                                                               zh3               1                                                         Zurich                      1                                            
```

### Business rules analysis
Subnet extension with 2 nodes finished with the total penalty 60. Penalty causes throughout the extension:

- adding node 1 of 2 (os2wv): data_center_owner Equinix controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- adding node 1 of 2 (os2wv): Country US controls 5 of nodes, which is higher than target of 3 for the subnet. Applying penalty of 20.
- adding node 2 of 2 (dyycg): data_center_owner Navegalo controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- adding node 2 of 2 (dyycg): Country US controls 5 of nodes, which is higher than target of 3 for the subnet. Applying penalty of 20.

Business rules analysis is calculated on each operation. Typically only the last operation is relevant, although this may depend on the case.



Replace nodes in subnet uzr34