Commit Graph

578 Commits

Author SHA1 Message Date
Jacek Sieka d6f317950c
Compute state root instead of loading from database (#1297)
htr is fast now, so hitting the database to load the state root is no
longer motivated - the more simple code is less vulnerable to database
corruption.
2020-07-10 22:47:39 +02:00
Zahary Karadjov c06c60dcaf
Merge branch 'devel' into cli-reforms 2020-07-10 16:23:27 +03:00
tersec 5d5957fd7e
fix attestation handling bottlenecks in slot processing and quadratic-time inclusion delay rewards/palties in epoch processing; create infrastructure for dynamically (un)subscribing to/from attestation topics (#1294) 2020-07-10 09:24:04 +00:00
Zahary Karadjov 3ec6a02b12
Merge devel and resolve conflicts 2020-07-10 02:02:40 +03:00
tersec 61b0b5af17
update most remaining non-fork-choice spec refs, updating code where necessary (#1292)
* update most of the remaining non-fork-choice spec refs, updating code where necessary

* revert presumably harmless compute_signing_root() change, but this way, keep things really unchanged outside inspector
2020-07-09 11:43:27 +00:00
Mamy Ratsimbazafy 3cdae9f6be
Dual headed fork choice [Revolution] (#1238)
* Dual headed fork choice

* fix finalizedEpoch not moving

* reduce fork choice verbosity

* Add failing tests due to pruning

* Properly handle duplicate blocks in sync

* test_block_pool also add a test for duplicate blocks

* comments addressing review

* Fix fork choice v2, was missing integrating block proposed

* remove a spurious debug writeStackTrace

* update block_sim

* Use OrderedTable to ensure that we always load parents before children in fork choice

* Load the DAG data in fork choice at init if there is some (can sync witti)

* Cluster of quarantined blocks were not properly added to the fork choice

* Workaround async gcsafe warnings

* Update blockpoool tests

* Do the callback before clearing the quarantine

* Revert OrderedTable, implement topological sort of DAG, allow forkChoice to be initialized from arbitrary finalized heads

* Make it work with latest devel - Altona readyness

* Add a recovery mechanism when forkchoice desyncs with blockpool

* add the current problematic node to the stack

* Fix rebase indentation bug (but still producing invalid block)

* Fix cache at epoch boundaries and lateBlock addition
2020-07-09 11:29:32 +02:00
Dustin Brody 4140b3b9d9 update 29 spec refs to v0.12.1 2020-07-08 20:49:25 +00:00
Zahary Karadjov 318b225ccd
Merge devel and resolve the conflicts 2020-07-08 15:36:03 +03:00
Zahary Karadjov 5d056ba667
Switch to uint64 as the default type for preset values 2020-07-08 14:00:40 +03:00
Viktor Kirilov 1482b0430d - work towards more REST API endpoints being implemented
- testnets can now be launched with a separate validator client - make altona SCRIPT_PARAMS="--separateVC"
- reverted the ctrl+C signal handler code reuse - not necessary for the VC anyway (default is good enough)
- added a bit more logging in the VC
- removed unnecessary code in the VC - connect() just parses the address & port...
- fixed a couple more VC issues - when fetching the duties for an epoch fails on the BN side ==> the VC shouldn't be left in a broken state
- documented the currently supported json-rpc endpoints
- added more checks on the BN side for the API - bounds-checking the requests & also checking if the BN itself is synced
- other cleanup

currently a local sim doesn't finalize, but participation in the altona network with a separate VC is painless and works just as well as with in-process validators in a BN
2020-07-08 13:29:03 +03:00
Dustin Brody fc8502c54e halve memory usage from state caches 2020-07-08 10:21:41 +00:00
Dustin Brody 8ac613421d only calculate total_balance once per attestation delta application 2020-07-08 07:45:21 +00:00
Dustin Brody 3c030d945d allow 50k validators on block_sim by avoiding repeated get_total_active_balance() in get_proposer_reward() 2020-07-08 07:45:21 +00:00
Zahary Karadjov c4af4e2f35
Working test suite with run-time presets 2020-07-08 02:02:14 +03:00
Jacek Sieka 6fe0a623f5
Crypto rng (#1284)
* use bearssl rng throughout

* bump

* bump

* move keygen out of crypto
2020-07-07 17:51:02 +02:00
Zahary Karadjov 441ae9b58c
Introduce a RuntimePreset object for the overridable testnet preset values 2020-07-03 22:29:23 +03:00
tersec a92276d510
adopt Result[void, string] in place of some bool return signatures (#1275)
* adopt Result[void, string] in place of some bool return signatures

* string -> cstring to reduce memory allocations; ensure all err() strings are constants, with contextual information from higher-level callers

* logScope usage fixes

* homogenize err() reporting convention

* invalid signature in deposit isn't an error
2020-07-03 17:03:14 +00:00
tersec c64737e7f2
implement aggregated attestation receiving/validating (#1272)
* implement aggregated attestation receiving/validating

* document the conditions without explicit implementations in isValidAggregatedAttestation()
2020-07-02 16:15:27 +00:00
Jacek Sieka f3e92762e3
add tests for unviable blocks (#1271)
* add tests for unviable blocks

also enable finalization tests in all test configs - they're plenty fast
now
also fix newClone for non-rvo cases. sigh.

* fixes
2020-07-01 19:00:14 +02:00
tersec b4db2ad693
remove v0.11.3 support; add block_sim to CI (#1253)
* remove v0.11.3 support; add block_sim to CI

* rm stray PERSISTENT_COMMITTEE_PERIOD

* remove TopicFilter.InteropAttestations

* bump two comment-spec-refs to v0.12.1
2020-06-29 18:08:58 +00:00
Zahary Karadjov 8140b4458c Working local sim with WAIT_GENESIS=yes 2020-06-29 02:18:48 +03:00
Zahary Karadjov 31e31bb30c Switch to monitoring of Blocks; More accurate genesis detection and faster Eth1 syncing 2020-06-29 02:18:48 +03:00
zah 578ea2013a
implement spev v0.12.1 in initialize_beacon_state_from_eth1 (#1236) 2020-06-25 16:24:55 +02:00
Jacek Sieka 1301600341
Trusted blocks (#1227)
* cleanups

* fix ncli state root check flag
* add block dump to ncli_db
* limit ncli_db benchmark length
* tone down finalization logs

* introduce trusted blocks

We only store blocks whose signature we've verified in the database - as
such, there's no need to check it again, and most importantly, no need
to deserialize the signature when loading from database.

50x startup time improvement, 200x block load time improvement.

* fix rewinding when deposits have invalid signature
* speed up ancestor iteration by avoiding copy
* avoid deserializing signatures for trusted data
* load blocks lazily when rewinding (less memory used)

* chronicles workarounds

* document trustedbeaconblock
2020-06-25 12:23:10 +02:00
Mamy Ratsimbazafy 902093f57c
Revert "Dual headed fork choice [Reloaded] (#1223)" (#1234)
This reverts commit 6836d41ebd.
2020-06-25 11:36:03 +02:00
Zahary Karadjov 384e512031 Implement EIP-2386 wallets; Progress towards a CLI for interactive wallet creation
For more information:
4494da0966/EIPS/eip-2386.md (specification)
2020-06-24 23:06:05 +03:00
Mamy Ratsimbazafy 6836d41ebd
Dual headed fork choice [Reloaded] (#1223)
* Dual headed fork choice

* fix finalizedEpoch not moving

* reduce fork choice verbosity

* Add failing tests due to pruning

* Properly handle duplicate blocks in sync

* test_block_pool also add a test for duplicate blocks

* comments addressing review
2020-06-24 20:24:36 +02:00
tersec 1b3c19dc21
default to v0.12.1 beacon chain spec, keeping witti working (#1222)
* default to v0.12.1 beacon chain spec, keeping witti working

* a couple of fixes that help for the Onyx testnet
2020-06-23 19:40:44 +00:00
tersec 807b920c19
state_transition implements the spec fairly directly (#1220) 2020-06-23 13:54:24 +00:00
Zahary Karadjov e9d68e2f7b Add simulation mode that bootstraps from an Eth1 ganache instance 2020-06-22 17:30:04 +03:00
Dustin Brody 62a7e7fede fix is_valid_indexed_attestation() to check for too-high attestation indices 2020-06-22 14:15:51 +00:00
tersec 7b4e129316
re-add minimal constant checking; organize presets by spec version (#1203)
* re-add minimal preset constant checking; organize presets to better support multiple spec versions

* bump spec ref

* increase Azure timeout to 90 minutes to accomodate Nim compiler building
2020-06-20 09:12:45 +02:00
Dustin Brody 4ecbc655ea switch 11 beaconstate.nim spec refs from v0.11.x to v0.12.1 2020-06-19 11:54:37 +00:00
Viktor Kirilov 72dfe7f578 - updated the validator shell script after the keystore changes
- better logging & retrying requests on the VC side if the BN fails for some reason
- VC now fetches the attestation duties 1 epoch in advance - in the future it will tell the BN to subscribe to the appropriate attestation topics in advance based on that info
- a bunch of other code cleanup & fixes such as better naming for consoles when using multitail, etc.

reviewed in PR #1184 - proper review of the API & VC are pending
2020-06-19 12:21:22 +03:00
tersec dc1a565b3f
support v0.12.1 attestation topics in beacon node/inspector subscribing (#1187)
* support v0.12.1 attestation topics in beacon node and inspector subscribing

* bump is_valid_merkle_branch() spec ref
2020-06-18 15:10:25 +02:00
Dustin Brody db870fead4 update 20 beacon chain protocol spec refs 2020-06-18 08:39:28 +00:00
tersec ee9f4a2e3f
remove skipMerkleValidation and skipBlockParentRootValidation (#1197) 2020-06-18 07:56:47 +02:00
Dustin Brody ffca27b45f update 24 v0.11.x spec refs to v0.12.1 2020-06-17 12:11:03 +00:00
Dustin Brody ec85a8bdbf update a dozen unchanged spec refs to v0.12.1 2020-06-17 09:25:54 +00:00
Jacek Sieka 5c25d23ef1 eth2hash -> eth2digest
hash in nim is the insecure hash-map helper - might as well use `digest`
consistently to mark the difference
2020-06-16 13:30:21 +00:00
Jacek Sieka 89e4819ce9
collect signature production and verificaiton in one place (#1179)
* collect signature production and verificaiton in one place

Signatures are made over data and domain - here we collect all such
activities in one place.

Also:
* security: fix cast-before-range-check
* log block/attestation verification consistently
* run block verification based on `getProposer` in its own history
* clean up some unused stuff

* import

* missing raises
2020-06-16 07:45:04 +02:00
Dustin Brody 8a2c796e83 switch 12 unchanged spec references from 0.11.x to 0.12.1; line-wrap and remove pointless-to-counterproductive "return" 2020-06-15 10:10:31 +00:00
Jacek Sieka 360ebd705f db: compress with snappy
* 3gb vs 12gb for 4000 epochs of witti
* 3-4x sync blocks/sec performance improvement on my FDE SSD drive
* generate less quirky code for primitive types
2020-06-14 11:33:00 +03:00
Dustin Brody 1d1e90adf4 Update 36 spec refs from 0.11.x to 0.12.1 2020-06-12 19:41:03 +00:00
Jacek Sieka 78b767f645
avoid genericAssign for beacon node types (#1166)
* avoid genericAssign for beacon node types

ok, I got fed up of this function messing up cpu measurements - it's so
ridiculously slow, it's sad.

before, while syncing:

```
40,65%  beacon_node_shared_witti_0  [.]
genericAssignAux__U5DxFPRpHCCZDKWQzM9adaw
   9,02%  libc-2.31.so                [.] __memmove_avx_unaligned_erms
   7,07%  beacon_node_shared_witti_0  [.] BIG_384_58_monty
   5,19%  beacon_node_shared_witti_0  [.] BIG_384_58_mul
   2,72%  beacon_node_shared_witti_0  [.] memcpy@plt
   1,18%  [kernel]                    [k] rb_next
   1,17%  beacon_node_shared_witti_0  [.] genericReset
   1,06%  [kernel]                    [k] map_private_extent_buffer
```

after:

```
  24,88%  beacon_node_shared_witti_0  [.] BIG_384_58_monty
  20,29%  beacon_node_shared_witti_0  [.] BIG_384_58_mul
   3,15%  beacon_node_shared_witti_0  [.] BIG_384_58_norm
   2,93%  beacon_node_shared_witti_0  [.] BIG_384_58_add
   2,55%  beacon_node_shared_witti_0  [.] BIG_384_58_sqr
   1,64%  beacon_node_shared_witti_0  [.] BIG_384_58_mod
1,63%  beacon_node_shared_witti_0  [.]
sha256Transform__BJNBQtWr9bJwzqbyfKXd38Q
   1,48%  beacon_node_shared_witti_0  [.] FP_BLS381_add
   1,39%  beacon_node_shared_witti_0  [.] BIG_384_58_sub
   1,33%  beacon_node_shared_witti_0  [.] BIG_384_58_dnorm
   1,14%  beacon_node_shared_witti_0  [.] FP2_BLS381_mul
   1,05%  beacon_node_shared_witti_0  [.] BIG_384_58_cmove
1,05%  beacon_node_shared_witti_0  [.]
get_shuffled_seq__4uncAHNsSG3Pndo5H11U9aQ
```

* better field iteration
2020-06-12 21:10:22 +02:00
Jacek Sieka 42832cefa8
Small fixes (#1165)
* random fixes

* create dump dir on startup
* don't crash on failure to write dump
* fix a few `uint64` instances being used when indexing arrays - this
should be a compile error but isn't due to compiler bugs
* fix standalone test_block_pool compilation
* add signed block processing in ncli

* reuse cache entry instead of allocating a new one

* allow for small clock disparities when validating blocks
2020-06-12 18:43:20 +02:00
Zahary Karadjov fdaf419e41 Address review comments 2020-06-11 17:40:08 +03:00
Zahary Karadjov a8113cf2bc Restore the local sim to a working state 2020-06-11 17:40:08 +03:00
Zahary Karadjov 17343442ea Implement more of the KeyStore spec and integrate it in the beacon node 2020-06-11 17:40:08 +03:00
Viktor Kirilov e7febc2e2b can finalize successfully with external VCs! + some other cleanup 2020-06-10 13:50:50 +03:00
Viktor Kirilov 3bae40ae91 - extracted the commands to run a VC into a separate run_validator.sh script
- each BN gets half of its previous validators as inProcess and the other half goes to the respective VC for that BN - using separate data dirs where the keys are copied
    - also removed a few command line options which are no longer necessary
- block proposals originating from a VC are propagated from one BN to the rest properly
- other cleanup & moving code back to  since it is no longer used elsewhere
2020-06-10 13:50:50 +03:00
Mamy Ratsimbazafy ce897fe83f
[Split fork choice PR] Derisk-ed attestation checks changes (#1154)
* Derisked attestation pool improvements

* tune down frequent logs

* VoteTracker logging
2020-06-10 08:58:12 +02:00
Dustin Brody a9f73ac8fb poke 2020-06-09 18:39:05 +00:00
Dustin Brody 8f7541959a allow compile-time switching between v0.11.3 and v0.12.1 2020-06-09 18:39:05 +00:00
Dustin Brody 36f15a3688 complete re-implmentation of reasonable asymptotic-complexity algorithms from 0.11.3 2020-06-09 18:39:05 +00:00
Dustin Brody 35f67cec60 remove the scaffolding get_empty_per_epoch_cache() calls and the pointless construction and return/discarding of zero-filled arrays 2020-06-09 18:39:05 +00:00
Dustin Brody cc13153fc6 initial 0.12.1 beacon chain spec 2020-06-09 18:39:05 +00:00
Zahary Karadjov 32bc4d9096 Use {.push raises.} in spec/datatypes
This was an attempt to trigger a previously reported crash, but
everything turned out to be fine.
2020-06-05 19:33:30 +03:00
Dustin Brody 3cb7896bab 12x speedup on state sim with 100k validators sans BLS by caching get_beacon_proposer_index(...) 2020-06-04 17:07:51 +00:00
Jacek Sieka 56ffb696be
reorder ssz (#1099)
* reorder ssz

* split into hash_trees and ssz_serialization, roughly, for hashing and
IO
* move bitseqs into ssz (from stew)
* clean up imports

* docs, imports
2020-06-03 15:52:02 +02:00
Jacek Sieka 07393c8de6
Ssz cache (#1084)
* wip: cache

* cache lists and arrays of complex objects (5x block processing speed
on ncli_db)

trivial baseline cache that stores tree in flat memory structure

* support array of uint64

* work around type issues

* more type compiler bug workarounds

* cache balances, more type fixes

* index type

* ncli_db: add validation flag, better ux

* int64 fixes

* test fix

* "oops"

```
647.913,        0.000,      647.913,      647.913,            1,
Initialize DB
0.540,        0.402,        0.340,        9.451,          619,
Load block from database
40.268,        0.000,       40.268,       40.268,            1,
Load state from database
0.498,        0.150,        0.343,        0.930,          596,
Apply block
3.548,       11.005,        0.729,       54.022,           23,
Apply epoch block
```

* support all basic types

* cleanups

* a few more cleanups
2020-06-03 07:57:17 +02:00
tersec b7bb62d48b
use shuffled validator cache in more places; cleanups (#1095) 2020-06-03 07:42:08 +02:00
Jacek Sieka 1d9a58f1e8
a few more cleanups 2020-06-02 22:10:45 +02:00
Dustin Brody 1a6b83a15f cleanups 2020-06-01 19:45:21 +00:00
Zahary Karadjov ef90a45509
Bump testutils 2020-06-01 16:58:28 +03:00
Jacek Sieka fec01829c4
cache balances, more type fixes 2020-06-01 14:52:52 +02:00
Jacek Sieka be92842944
more type compiler bug workarounds 2020-06-01 14:52:52 +02:00
Jacek Sieka 4fc9a84c57
support array of uint64 2020-06-01 14:52:52 +02:00
Jacek Sieka f1dcee2749
wip: cache
* cache lists and arrays of complex objects (5x block processing speed
on ncli_db)

trivial baseline cache that stores tree in flat memory structure
2020-06-01 14:52:50 +02:00
tersec a327e8581b
switch state transition caching to match EpochRef (#1089)
* switch state transition caching usage to shuffled active validator indices to match EpochRef

* refactor the EpochRef -> StateCache transformation; elide pointless mapIt

* limit state passed between get_beacon_committee(...) and compute_committee(...)

* tweaks
2020-06-01 09:44:50 +02:00
Zed c570abf602 Check iv length for decryption 2020-05-29 16:38:55 +03:00
Zed 80ce960afa Minor improvements 2020-05-29 16:38:55 +03:00
Zed 49c083d5b7 Catch all exceptions 2020-05-29 16:38:55 +03:00
Zed 14ad100b45 Address comments 2020-05-29 16:38:55 +03:00
Zed 8496e20a78 Implement EIP 2335 compliant keystore
Closes #1024
2020-05-29 16:38:55 +03:00
tersec b5f45db5e9
keep cache of per-epoch items in block pool (#1068)
* plumbing between block pool and state transition functions around active validator indices and committees

* have shared epochrefs followed by blockref tree while allowing for skipped slots

* factor out the epoch info extraction; document how the EpochRef follows forks
2020-05-29 08:10:20 +02:00
Jacek Sieka f53b55cbe0 SSZ cleanup
* be stricter about SSZ length prefix
* compute zeroHash list at compile time
* remove SSZ schema stuff
* move SSZ navigation to ncli
* cleanup a few leftover openArray uses
2020-05-28 19:15:16 +03:00
Viktor Kirilov cefd525ab3 more work on the BN/VC split
- fixed comments from the last review
- getting more data VIA RPC, moved some code back into the BN only
- attestation duties being requested as well
2020-05-28 13:01:42 +03:00
Dustin Brody 0929d90d93 unexport candidate_chains.init; some spec version bumps 2020-05-26 05:06:37 +00:00
Viktor Kirilov 8760494c72 first batch of work towards the VC/BN split:
- we have a new binary which connects via RPC to the respective BN and has an internal clock - waking it up on every slot
- the BN has a new option called --external-validators and currently in order to have the VC binaries to run we need to pass EXTERNAL_VALIDATORS=yes to make
- factored some code out of beacon_node.nim for easier reuse in validator_api.nim and validator_client.nim
- the VC loads its associated private keys from the datadir for its BN
- most of the validator API calls have been implemented as a stub.
- the VC polls its BN at the start of each epoch - getting a list of all active validators for the current epoch - and then continues to request blocks and sign them with its appropriate validators when necessary
2020-05-25 16:23:15 +03:00
Zahary Karadjov a8003e7e38 More complete integration of the List type; Detect more invalid inputs; Enable more tests 2020-05-24 19:00:34 +03:00
Dustin Brody 74e35c464f halt processing if one of the operation functions fails (failed deposits due to BLS signature issues return as not-failed, so it remains consistant with that 2020-05-24 08:20:13 +00:00
Dustin Brody 67ba11cc1a use template to more cleanly implement for_ops 2020-05-24 08:20:13 +00:00
Dustin Brody 95ee0218db switch too-strict/against-spec operations processing to use spec-based process_operations 2020-05-24 08:20:13 +00:00
Jacek Sieka f06df1cea6 remove some copies
* in makeBeaconBlock - use rollback instead
* in tests - this helps state_sim give more accurate data and makes it
30% faster
* fix some usages of raw BeaconState
2020-05-22 17:15:35 +00:00
tersec 80b8416305
skip skipped constant sanity checks also from markdown reports' perspectives (#1053)
* update more spec refs in beacon_chain/spec/presets; skip skipped constant sanity checks also from markdown reports' perspectives

* mark skipped as skipped in markdown
2020-05-21 19:56:09 +02:00
Dustin Brody b9817867f5 audit & update spec references for some slashing and rewards and penalty functions; check and update all remaining v0.11.0 spec references to v0.11.3 [skip ci] 2020-05-20 14:57:08 +00:00
Dustin Brody 3fa2f70853 update all remaining beacon chain spec references from v0.11.1 and v0.11.2 to v0.11.3 2020-05-20 08:48:18 +00:00
Dustin Brody 6c941b1ff7 spec v0.11.3 update 2020-05-19 17:16:55 +00:00
Zahary Karadjov a99977b772 Progress towards #991; Enable the distinct ssz.List type 2020-05-19 15:53:03 +03:00
tersec 8432932c11
update to spec v0.11.2 to keep compatible with Schlesi (#1036)
* update to spec v0.11.2 to keep compatible with Schlesi

* update spec/state_transition_epoch spec references to v0.11.2

* bump other spec refs
2020-05-18 23:05:27 +00:00
Dustin Brody 2ddc507e5b update datatypes v0.11.1 spec references to v0.11.2 2020-05-14 16:33:11 +00:00
Dustin Brody 57519bebac remove some unused imports, add tests for pubsub topics, and subscribe to interop attestations 2020-05-14 16:41:46 +03:00
Zahary Karadjov a739d7e8d6 Adapt SSZ to the latest FastStreams API 2020-05-13 12:18:42 +03:00
Jacek Sieka fb2e0ddbec
sync fixes (#1005)
* sync fixes

* fix Status message finalized info
* work around sync starting before initial status exchange
* don't fail block on deposit signature check failure (fixes #989)
* print ForkDigest and Version nicely
* dump incoming blocks
* fix crash when libp2p peer connection is closed
* update chunk size to 16 to work around missing blocks when syncing

* bump libp2p

* bump libp2p

* better deposit skip message
2020-05-11 18:08:52 +00:00
Ștefan Talpalaru a7a50824a1
more metrics (#1004) 2020-05-11 06:25:49 +00:00
tersec 093d298b2b
Increase finalization and finalization checking robustness (#990)
* fix some warnings related to beacon_node splitting; reimplement finalization verification more robustly; improve attestation pool block selection logic

* re-add missing import

* whitelist allowed state transition flags and make rollback/restore naming more consistent

* restore usage of update flags passed into skipAndUpdateState(...) in addition to the potential verifyFinalization flag

* switch rest of rollback -> restore
2020-05-09 12:43:15 +00:00
Ștefan Talpalaru c572f61129
bump vendor/nim-metrics 2020-05-09 01:13:57 +02:00
tersec c548b90a0e
default preset update; rm process_slots(BeaconState); some BLS skipping disabled (#963)
* re-enable BLS validation for block sanity tests

* update default preset to mainnet; remove process_slots(state: var BeaconState)

* bump spec ref to v0.11.1

* bump all v0.11.1 spec references except the actually changed is_valid_indexed_attestation(...) in spec/beaconstate to v0.11.2

* remove stack-risky/low-ROI doAssert
2020-05-04 21:07:18 +00:00
Jacek Sieka 2449d4b479
cache empty slot state root (#961)
When replaying state transitions, for the slots that have a block, the
state root is taken from the block. For slots that lack a block, it's
currently calculated using hash_tree_root which is expensive.

Caching the empty slot state roots helps us avoid recalculating this
hash, meaning that for replay, hashes are never calculated. This turns
blocks into fairly lightweight "state-diffs"!

* avoid re-saving state when replaying blocks
* advance empty slots slot-by-slot and save root
* fix sim randomness
* fix sim genesis filename
* introduce `isEpoch` to check if a slot is an epoch slot
2020-05-03 19:44:04 +02:00