A Golang implementation of the Nebula network, a decentralized universal capital facility in the Cosmos ecosystem.

Nebula is a Universal Capital Facility that can collateralize assets on one blockchain towards borrowing assets on another blockchain. The platform specializes in allowing staked assets from PoS blockchains to be used as collateral for borrowing across blockchains. The platform uses a combination of algorithmically determined interest rates based on market driven conditions. As a cross chain DeFi protocol, Nebula will allow a multitude of decentralized debt products.

Table of Contents

• Table of Contents
• Releases
  • Release Compatibility Matrix
• Active Networks
  • Public
• Install
  • Swagger

Releases

See Release procedure for more information about the release model.

Since nebud v3.2 there is a new runtime dependency: libwasmvm.x86_64.so v1.1.1 is required. Building from source will automatically link the libwasmvm.x86_64.so created as a part of the build process (you must build on same host as you run the binary, or copy the libwasmvm.x86_64.so your lib directory).

Release Compatibility Matrix

Nebula Version	Mainnet	Experimental	Cosmos SDK	IBC	Peggo	Price Feeder	Gravity Bridge
v0.8.x	✗	✓	v0.45.x	v2.0.x	v0.2.x	v0.1.x
v1.x.x	✓	✗	v0.45.x	v2.0.x	v0.2.x	N/A	nebula/v1 module/v1.4.x-nebula
v2.x.x	✗	✓	v0.45.x	v2.3.x	v0.2.x	v0.2.x	nebula/v2 module/v1.4.x
v3.0-1.x	✓	✗	v0.46.x	v5.0.x	v1.3.x+	v1.0.x	nebula/v3 module/v1.5.x-nebula
v3.2.x	✓	✗	v0.46.6+	v5.0.x	v1.3.x+	v2.0.x	nebula/v3 v1.5.3-nebula-3

Active Networks

Public

• nebula-1 (mainnet)
• canon-2 (testnet)

Install

To install the nebud binary:

$ make install

Swagger

• To enable it, modify the node config at $NEBULA_HOME/config/app.toml to api.swagger true
• Run the node normally nebud start
• Enter the swagger docs http://localhost:1317/swagger/

Cosmovisor

Docs Note: cosmovisor only works for upgrades in the nebud, for off-chain processes updates like peggo or price-feeder, manual steps are required.

• cosmovisor is a small process manager for Cosmos SDK application binaries that monitors the governance module for incoming chain upgrade proposals. If it sees a proposal that gets approved, cosmovisor can automatically download the new binary, stop the current binary, switch from the old binary to the new one, and finally restart the node with the new binary.

• Install it with go

go install cosmossdk.io/tools/cosmovisor/cmd/cosmovisor@latest

• For the usual use of cosmovisor, we recomend setting theses env variables

export DAEMON_NAME=nebud
export DAEMON_HOME={NODE_HOME}
export DAEMON_RESTART_AFTER_UPGRADE=true
export DAEMON_ALLOW_DOWNLOAD_BINARIES=true
export DAEMON_PREUPGRADE_MAX_RETRIES=3

• If you didn't build binary from source in the machine, you have to download the respective libwasmvm into your machine.

$ wget https://raw.githubusercontent.com/CosmWasm/wasmvm/v1.1.1/internal/api/libwasmvm.$(uname -m).so -O /lib/libwasmvm.$(uname -m).so

• To use cosmovisor for starting nebud process, instead of calling nebud start, use cosmovisor run start [nebud flags]