agenda
genesis ID
- questions
- we compute genesis id as hash(genesis_time, genesis_extra_data), and take 20 bytes from that
- golden atx is equal to that previous value, but padded with 12 empty bytes. which is just looks strange
- expected outcome
- final spec for genesis ID
gas table
- UPDATED proposal Gas cost for precompiles
- Iddo, Noam, Wojtek please review ahead of meeting
- expected outcome
- a finalized approach to calculate gas table
post param
- data from 3 sets of params
- gpu-post bug: Vulkan POST implementation is broken
- N=8192 is needed for asic resistance
- mainnet param & determine whether it’s more cost-effective to rent gpu or run a gpu farm than storing data
- expected outcome
- decide initialization time and unit size
post update path
- there is no known way to change network post params after mainnet launch without network-wide re-initialization
- feasibility of supporting multiple version of post params
- feasibility of network-wide re-initialization and how
- expected outcome
- a plan for post param update
discussion on vm design
- ppl are not on the same page wrt spacemesh L1 & L2 separation plan
- perhaps Iddo can outline the plan verbally for us first, follow by a Q&A/discussion
- expected outcome
- team on the same page on spacemesh’s L1/L2 separation and beyond
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meeting summary
gas table
- adopt Gas cost for precompiles proposal with tweaks
- spawn (updating 2 accounts) is more expensive than self-spawn (updating 1 account)
- gas for multisig accounts (1/k, 2/k, 3/k) should be a function of k
- 1000 smidges / gas unit to allow for more granularity
- at genesis, smapp set minimum gas price to 1000 smidges (configurable) and miners will not accept txs lower than this minimum gas price
- use first-price auction (miners select txs with highest gas price) for genesis (already implemented). but this is not the end-game. it will need to be adjusted post-genesis.
- AI:
- Dmitry create issues for implementations for the proposal
genesis ID
- use unix timestamp (uint64) instead of timestamp string literal.
- genesis data contain some last-minute revealed data like bitcoin block hash
- golden atx use the original 32 byte hash instead of hash32->hash20->pad0
- AI:
discussion on vm design
- ppl ARE on the same page wrt spacemesh-specific L1/L2 separation
- AI:
- Iddo follow up on discussion with Dmitry about evm compatibility
use fixed-precision math in consensus code
post update path
- some params don’t require network-wide re-initialization (k2)
- change to N iteration will require re-initialization
- by design, difficult can be adjusted by reducing label size from 16 byte to <1 bit per label (a.k.a labelsperbit). but this is not currently supported
- delay the discussion on update path after more info on Vulcan bug fix (multiple fronts)
- AI:
post param
- unit size 64 GB, min unit size 4.
- there is a gap btwn theory and actual data. for adversary that choose to store 70% of data, the chance of failure should be 99.9%, but is not according to Bartosz data. for K1-279, K2=300, adversary only needs 21K nonces, while it should be 1million nonces
- segment size of AES output selection
- launch test net with K1: 279, K2: 300, K3:65 to make it difficult for re-calculating
- AI:
- Iddo follow up discussions
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