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[#97] Document notary service in chains

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`notary.md` contains brief description about
notary service and steps to enable or disable
it in neofs-dev-env chains.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
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Alex Vanin 2021-06-16 13:20:05 +03:00 committed by Alex Vanin
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# Notary service in chains
[Notary service](https://github.com/neo-project/neo/issues/1573#issuecomment-704874472)
is a service that provides on-chain network assistance to form multisignature
transactions. Inner Ring (Alphabet) nodes use multisignature transactions to
create containers, approve balance changes, update network map, tick epochs,
etc. With notary service, it takes up to seven times fewer transactions
to do these operations. Notary service calculates the exact amount of GAS
to execute transaction, therefore operations are cheaper (withdraw fee **with**
notary is less than 0.5 GAS; withdraw fee **without** notary is up to 7.0 GAS).
By default, main chain service is running without notary service, and side chain
running with notary service. However, you can change that in configuration.
# Disable notary service in side chain
To disable notary service in side chain do these steps.
1. Update `.env` and choose notary disabled chain dump for side chain.
```
MORPH_CHAIN_URL="https://github.com/nspcc-dev/neofs-contract/releases/download/v0.9.0/devenv_sidechain_notary_disabled.gz"
```
Make sure to update chain dump files with `make get` target.
2. Update `service/morph_chain/protocol.privnet.yml` and disable notary settings
and state root in header.
```yaml
ProtocolConfiguration:
StateRootInHeader: false
P2PSigExtensions: false
ApplicationConfiguration:
P2PNotary:
Enabled: false
```
3. Update `services/ir/.ir.env` and disable notary support.
```
NEOFS_IR_WITHOUT_NOTARY=true
```
Chain dump without notary service does not have predefined network map.
Therefore, you need to wait about 5 minutes until new epoch tick with updated
network map.
All helper commands such as `make tick.epoch` or `make update.epoch_duration`
are designed as multisignature transactions, so you can't use them without
notary.
# Enable notary service in main chain
To enable notary service in main chain do these steps.
1. Update `.env` and choose notary enabled chain dump for main chain.
```
CHAIN_URL="https://github.com/nspcc-dev/neofs-contract/releases/download/v0.9.0/devenv_mainchain.gz"
```
Make sure to update chain dump files with `make get` target.
2. Update `service/chain/protocol.privnet.yml` and enable notary settings.
```yaml
ProtocolConfiguration:
P2PSigExtensions: true
ApplicationConfiguration:
P2PNotary:
Enabled: true
```
3. Update `services/ir/.ir.env` and enable main chain notary support.
```
NEOFS_IR_WITHOUT_MAIN_NOTARY=false
```
Main chain generates a block once per 15 seconds, so Inner Ring takes about
15-30 seconds to make a notary deposit in main chain after startup. Then
neofs-dev-env is ready to work.