1 of 5

September

October

November

December

January

2017

February

March

POW

Difficulty Bomb Active

5ETC/block in perpetuity

April

May

June

July

POW

Difficulty Bomb Removed

New POW Supply Model

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETC

August

October

December

February

April

September

November

January

2018

March

May

July

September

June

August

Hard Fork Timeline

Option 1

​

First Hard Fork

Supply model is changed

Difficulty bomb is defused

Timing of HF is in step with ETH

​

* Changes from HF are in Bold

​

POW

Difficulty Bomb Removed

New POW Supply Model

POS/Hybrid

Difficulty Bomb Defused

POS/Hybrid Supply Model

One year minimum between hard forks

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POS

Difficulty Bomb Removed

POS supply model

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETH

✔︎

X

X

✔︎

?

?

2 of 5

September

October

November

December

January

2017

February

March

April

May

June

July

August

October

December

February

April

September

November

January

2018

March

May

July

September

June

August

Hard Fork Timeline

Option 2

​

First Hard Fork

Supply model is changed

Difficulty bomb is defused

Timing of HF is sooner than ETH

​

* Changes from HF are in Bold

​

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POS

Difficulty Bomb Removed

POS supply model

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETH

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POW

Difficulty Bomb Removed

New POW Supply Model

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETC

POW

Difficulty Bomb Removed

New POW Supply Model

POS/Hybrid

Difficulty Bomb Removed

POS/Hybrid Supply Model

One year minimum between hard forks

✔︎

X

✔︎

X

?

?

3 of 5

September

October

November

December

January

2017

February

March

April

May

June

July

August

October

December

February

April

September

November

January

2018

March

May

July

September

June

August

Hard Fork Timeline

Option 3

​

First Hard Fork

Difficulty Bomb is removed only

Timing of HF is sooner than ETH

​

* Changes from HF are in Bold

​

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POS

Difficulty Bomb Removed

POS supply model

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETH

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POW

Difficulty Bomb Removed

5ETC/block in perpetuity

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETC

POW

Difficulty Bomb Removed

5ETC/block in perpetuity

POS/Hybrid

Difficulty Bomb Removed

POS/Hybrid Supply Model

One year minimum between hard forks

POW

Difficulty Bomb Removed

New POW Supply Model

✔︎

X

X

✔︎

X

?

?

4 of 5

POW

Difficulty Bomb Active

5ETC/block in perpetuity

September

October

November

December

January

2017

February

March

POW

Difficulty Bomb Active

5ETC/block in perpetuity

April

May

June

July

POS

Difficulty Bomb Removed

POS supply model

POW

Difficulty Bomb Delayed

5ETC/block in perpetuity

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETH

ETC

August

October

December

February

April

September

November

January

2018

March

May

July

September

June

August

Hard Fork Timeline

Option 4

​

First Hard Fork

Difficulty Bomb is delayed only

Timing of HF is sooner than ETH

​

* Changes from HF are in Bold

​

POW

Difficulty Bomb Delayed

5ETC/block in perpetuity

POS/Hybrid

Difficulty Bomb Removed

POS/Hybrid Supply Model

One year minimum between hard forks

POW

Difficulty Bomb Removed

New POW Supply Model

✔︎

X

X

✔︎

X

?

?

5 of 5

POW

Difficulty Bomb Active

5ETC/block in perpetuity

September

October

November

December

January

2017

February

March

POW

Difficulty Bomb Active

5ETC/block in perpetuity

April

May

June

July

POS

Difficulty Bomb Removed

POS supply model

POW

Difficulty Bomb Delayed

5ETC/block in perpetuity

POW

Difficulty Bomb Active

5ETC/block in perpetuity

POW

Difficulty Bomb Active

5ETC/block in perpetuity

ETH

ETC

August

October

December

February

April

September

November

January

2018

March

May

July

September

June

August

Hard Fork Timeline

Option 4b

​

First Hard Fork

Difficulty Bomb is delayed only

Timing of HF is sooner than ETH

​

Potential Attack Vector from cadre removing Difficulty bomb?

​

* Changes from HF are in Bold

​

POW

Difficulty Bomb Delayed

5ETC/block in perpetuity

POS/Hybrid

Difficulty Bomb Removed

POS/Hybrid Supply Model

One year minimum between hard forks

POW

Difficulty Bomb Removed

New POW Supply Model

POW

Difficulty Bomb Removed

5ETC/block in perpetuity

Potential attack vector?

(unintended consequence)

✔︎

X

X

✔︎

X

?

?

?