previous overflow condition is too big to use.
0x7FFFFFFFF squre operation is overflowed uint64.

0x7FFFFFFFF^2 = 0x3F FFFF FFF0 0000 0001

* contracts/ens: revert bmt to keccak256

* contracts/ens: fix keccak256 hash code comment

Solves #15210 without changing consensus, in a backwards compatible way,
by adding tx inclusion information to the Receipt struct.

core: 3rd try on splitting the trie metrics correctly

eth: remove redundant chain config fields

Fixes #19337

This PR is a more advanced form of the dirty-to-clean cacher (#18995),
where we reuse previous database write batches as datasets to uncache,
saving a dirty-trie-iteration and a dirty-trie-rlp-reencoding per block.

This PR fixes two issues in the PoW calculation of a Whisper envelope,
compared to the spec (see PoW Requirements):

- The pow is supposed to take the leading number of zeroes (i.e. most
  significant zeroes) and what it did was to take the number of trailing
  zeroes (i.e. least significant zeroes). It has been fixed to match what
  the spec and Parity does.
- The spec expects to use the size of the RLP encoded envelope, and it took
  something else, as described in #18070.

core: make txpool handle reorg due to setHead

core: split trie op metrics from the correct chain metrics

metrics: fix expensive metrics flag processing

* core: split out detailed trie access metrics from insertion time

* cmd, core, metrics: support expensive optional metrics

* cmd/swarm, p2p, swarm: Enable ENR in binary/execadapter

* cmd/p2p/swarm: Remove comments + config.Enode nomarshal

* p2p/simulations: Remove superfluous error check

* p2p/simulation: Move init enode comment

* swarm, p2p/simulations, cmd/swarm: Use nodekey in binary record sign

* swarm/network, swarm/pss: Dervice bzzkey

* swarm/pss: Remove unused function

* swarm/network: Store swarm private key in simulation bucket

* swarm/pss: Shorten TextProxNetwork shortrunning test timeout

* swarm/pss: Increase prox test timeout

* swarm/pss: Increase timeout slightly on shortrunning proxtest

* swarm/network: Simplify bucket instantiation in servicectx func

* p2p/simulations: Tcpport -> udpport

* swarm/network, swarm/pss: Simplify + correct lock in servicefunc sim

* swarm/network: Cleanup after rebase on extract swarm enode new

* p2p/simulations, swarm/network: Make exec disc test pass

* swarm/network: Prune ye olde comment

* swarm/pss: Correct revised bzzkey method call

* swarm/network: Clarify comment about privatekey generation data

* swarm/pss: Fix syntax errors after rebase

* swarm/network: Rename misleadingly named method

(amend commit to trigger ci - attempt 5)

* trie: disable fnv64a hashing of hashes for bigcache

* trie/database: add very important period

* swarm/network/simulation: test cases refactored

* swarm/pss: minor refactoring

* swarm/simulation: UploadSnapshot updated

* swarm/network: style fix

* swarm/pss: bugfix

* cmd/swarm, p2p, swarm: Enable ENR in binary/execadapter

* cmd/p2p/swarm: Remove comments + config.Enode nomarshal

* p2p/simulations: Remove superfluous error check

* p2p/simulation: Move init enode comment

* swarm/api: Check error in config test

* swarm, p2p/simulations, cmd/swarm: Use nodekey in binary record sign

* cmd/swarm: Make nodekey available for swarm api config

* travis: remove verbose from Swarm race tests

By removing -v our output will be cleaner, but the Travis job still
won't be terminated - due to 'no output for 10 minutes' - as keepalive
.sh produces a log line every 5 minutes.

* travis: extend Swarm race detection to p2p subpackages

As p2p/protocols, p2p/simulations and p2p/testing packages mostly
belong to the Swarm team.

* les: fixed peer id format

* les: fixed peer reply error handling

* contracts/ens: update public resolver solidity code

* contracts/ens: update public resolver, update go bindings

* update build

* fix ens.sol

* contracts/ens: change contract interface

* contracts/ens: implement public resolver changes

* contracts/ens: added ENSRegistry contract

* contracts/ens: reinstate old contract code

* contracts/ens: update README.md

* contracts/ens: added test coverage for fallback contract

* contracts/ens: added support for fallback contract

* contracts/ens: removed unused contract code

* contracts/ens: add todo and decode multicodec stub

* add encode

* vendor: add ipfs cid libraries

* contracts/ens: cid sanity tests

* contracts/ens: more cid sanity checks

* contracts/ens: wip integration

* wip

* Revert "vendor: add ipfs cid libraries"

This reverts commit 29d9b6b294ded903a1065d96c8149119713cfd12.

* contracts/ens: removed multiformats dependencies

* contracts/ens: added decode tests

* contracts/ens: added eip spec test, minor changes to exiting tests

* contracts/ens: moved cid decoding to own file

* contracts/ens: added unit test to encode hash to content hash

* contracts/ens: removed unused code

* contracts/ens: fix ens tests to use cid decode and encode

* contracts/ens: adjust swarm multicodecs after pr merge

* contracts/ens: fix linter error

* constracts/ens: address PR comments

* cmd, contracts: make peoples lives easier

* contracts/ens: fix linter error

* contracts/ens: address PR comments

les, light: verbose errors on state retrieval issues

* dashboard: fix github alerts

* dashboard: run go generate

Updates to match EIP1767

* swarm/pss: fixed bug in pss.process, test added

* swarm/pss: test case updated

* swarm/pss: WaitTillSnapshotRecreated() func added

* swarm/pss: snapshot test updated

* swarm/pss: WaitTillSnapshotLoaded() fixed

* swarm/pss: gofmt applied

* swarm/pss: refactoring, file renamed

* swarm/pss: input data fixed

* swarm/pss: race condition fixed

* swarm/pss: test timeout increased

* swarm/pss: eliminated the global variables

* swarm/pss: tests added

* swarm/pss: comments added

* swarm/pss: comment fixed

* swarm/pss: refactored according to review

* swarm/pss: style fix

* swarm/pss: increased timeout

* swarm/api, swarm/network, p2p/simulations: Prerequisites for handshake remove

* swarm, p2p: Add full sim node configs for protocoltester

* swarm/network: Make stream package pass tests

* swarm/network: Extract peer and addr types out of protocol file

* p2p, swarm: Make p2p/protocols tests pass + rename types.go

* swarm/network: Deactivate ExecAdapter test until binary ENR prep

* swarm/api: Remove comments

* swarm/network: Uncomment bootnode record load

* cmd/swarm: dont connect to bootnodes in tests

* cmd/utils: check for empty string when parsing enode