sudo yum install -y yum-utils
sudo yum-config-manager \
  --add-repo=https://get.blockbridge.com/tools/5.0/centos/blockbridge-tools.repo
sudo yum install -y blockbridge-cli

Retrieving key from https://get.blockbridge.com/RPM-GPG-KEY-Blockbridge
Importing GPG key 0x7ECF5373:
 Userid     : "Blockbridge (Official Signing Key) <security@blockbridge.com>"
 Fingerprint: 9c1d e2ae 5970 cfd4 adc5 e0ba ddde 845d 7ecf 5373
 From       : https://get.blockbridge.com/RPM-GPG-KEY-Blockbridge
Is this ok [y/N]: y

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl \
    gnupg-agent software-properties-common
curl -fsSL https://get.blockbridge.com/tools/5.0/ubuntu/gpg | sudo apt-key add -

# Verify Fingerprint / Authenticity
sudo apt-key fingerprint 7ECF5373
pub   rsa4096 2016-11-01 [SC]
      9C1D E2AE 5970 CFD4 ADC5  E0BA DDDE 845D 7ECF 5373
uid           [ unknown] Blockbridge (Official Signing Key) <security@blockbridge.com>
sub   rsa4096 2016-11-01 [E]

sudo apt-add-repository \
  "deb https://get.blockbridge.com/tools/5.0/ubuntu $(lsb_release -cs) main"
sudo apt-get update
sudo apt-get install -y blockbridge-cli

# cat > /etc/yum.repos.d/blockbridge-tools.repo <<-EOF
[blockbridge-tools]
name=Blockbridge Tools Repository
baseurl=https://get.blockbridge.com/tools/5.0/amzn/latest
enabled=1
gpgcheck=1
gpgkey=https://get.blockbridge.com/RPM-GPG-KEY-Blockbridge
EOF
# yum install blockbridge-cli

Retrieving key from https://get.blockbridge.com/RPM-GPG-KEY-Blockbridge
Importing GPG key 0x7ECF5373:
 Userid     : "Blockbridge (Official Signing Key) <security@blockbridge.com>"
 Fingerprint: 9c1d e2ae 5970 cfd4 adc5 e0ba ddde 845d 7ecf 5373
 From       : https://get.blockbridge.com/RPM-GPG-KEY-Blockbridge
Is this ok [y/N]: y