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# System prepended metadata

title: Danny / Barry 2019/11/25

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# Danny / Barry 2019/11/25

## Biggest problems 

### Shipping 

#### Phase 0 out 
#### Phase 0 refrozen

#### resources phase 1, 2, 3
#### eth2 dev ex owner

##### Ricmo ethers.js
#### Devops

##### Staking 
#### Increasing pressures for silcon valley kind of team


https://github.com/iden3/

## Barry

### zk rollup (iden3)

#### iden3
* issues in architecture
    * sparse merkle tree instead of regular
        * doesnt make sense in SNARKS
    * proof of stake. barry suggests proof of burn
    * withdrawal mechanism due to DoS problems from PoS
* circum language

#### loopring

* weirdness from ICOs, discounts,etc
* can reuse trusted setup and fork out ICO stuff

#### matter

* They are also doing more zkp stuff
* hype

### optimistic rollup

#### private optimistic

### hardware notes

