diff --git a/.gitignore b/.gitignore
index 0bbd89e..e9df4f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .subnet-cli.pk
+rpc/__pycache__/
diff --git a/README.md b/README.md
index c207e4b..9ff3493 100644
--- a/README.md
+++ b/README.md
@@ -342,7 +342,7 @@ Before validation staking expires, any wallet can not stake to a validator again
 
 Validator version distributions: [mainnet](https://explorer-xp.avax.network/validators), [testnet](https://explorer-xp.avax-test.network/validators)
 
-[Renew Numbers Validators](https://app.asana.com/0/1202305127727547/1202919355642524/f) (internal task)
+Renew Numbers Validators (see internal task tracker)
 
 ## Import Existing L1 in Avalanche CLI
 
@@ -461,7 +461,7 @@ Notes
 
 1. When upgrading node, you need to upgrade EVM and plugins as well.
 
-    > [jpop32 — 05/12/2021](https://discord.com/channels/578992315641626624/757576823570825316/841775940706762762)
+    > [Community discussion — 05/12/2021](https://discord.com/invite/numprotocol)
     > Plugin is the part of the installation. And it has to be upgraded along with the main executable, yes.
 
 Since `avalanchego v1.9.6`, there are two breaking changes
@@ -950,4 +950,4 @@ Make a Full Node instance to be an Archive Node instance:
         --data '{"method":"debug_traceTransaction","params":["0x7d2dec6c3e7ce2a387d988a0603ce7de6d487d6aeaf6b58eabdb123161cee0a2"],"id":1,"jsonrpc":"2.0"}'
     ```
 
-    [Discord discussion](https://discord.com/channels/578992315641626624/905684871731634196/1026850988042244247)
+    [Discord discussion](https://discord.com/invite/numprotocol)
diff --git a/api/env.sh b/api/env.sh
index bbb7296..950717b 100644
--- a/api/env.sh
+++ b/api/env.sh
@@ -1 +1,2 @@
+set -euo pipefail
 URL="127.0.0.1:9650"
diff --git a/api/health.health.sh b/api/health.health.sh
index f1c51d2..959506e 100755
--- a/api/health.health.sh
+++ b/api/health.health.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 curl -X POST --data '{
     "jsonrpc":"2.0",
diff --git a/api/info.getNetworkID.sh b/api/info.getNetworkID.sh
index bfcdb81..8d169b6 100755
--- a/api/info.getNetworkID.sh
+++ b/api/info.getNetworkID.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 source env.sh
 
diff --git a/api/info.getNetworkName.sh b/api/info.getNetworkName.sh
index 4a3b144..d3023a3 100755
--- a/api/info.getNetworkName.sh
+++ b/api/info.getNetworkName.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 source env.sh
 
diff --git a/api/info.getNodeID.sh b/api/info.getNodeID.sh
index e3c6c95..282dc22 100755
--- a/api/info.getNodeID.sh
+++ b/api/info.getNodeID.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Pre-running a node on Chainstake
 #
diff --git a/api/info.getVMs.sh b/api/info.getVMs.sh
index af97938..9ea760d 100755
--- a/api/info.getVMs.sh
+++ b/api/info.getVMs.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 source env.sh
 
diff --git a/api/info.isBootstrapped.sh b/api/info.isBootstrapped.sh
index 2940dfd..64695fe 100755
--- a/api/info.isBootstrapped.sh
+++ b/api/info.isBootstrapped.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Note: The bootstrapping process takes approximately 50–100 hours and requires 100 GB of space.
 # https://chainstack.com/avalanche-subnet-tutorial-series-running-a-local-avalanche-node-on-fuji-testnet/
diff --git a/api/info.peers.sh b/api/info.peers.sh
index 7fa32b2..895e5dd 100755
--- a/api/info.peers.sh
+++ b/api/info.peers.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 # Snow
 echo "========== Snow nodes information =========="
diff --git a/api/metrics.sh b/api/metrics.sh
index a527772..5678da7 100755
--- a/api/metrics.sh
+++ b/api/metrics.sh
@@ -1,3 +1,4 @@
 #!/bin/bash
+set -euo pipefail
 
 curl -X POST 127.0.0.1:9650/ext/metrics
diff --git a/api/platform.getBlockchainStatus.sh b/api/platform.getBlockchainStatus.sh
index e6b1c25..19d064b 100755
--- a/api/platform.getBlockchainStatus.sh
+++ b/api/platform.getBlockchainStatus.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # {
 #   "id": "fdesjrz477ot2iuUKdrGUephzHEfMN6AayMaWGXxhnZfkGRYr",
diff --git a/api/platform.getBlockchains.sh b/api/platform.getBlockchains.sh
index 66ef57b..3b2e62a 100755
--- a/api/platform.getBlockchains.sh
+++ b/api/platform.getBlockchains.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 source env.sh
 
diff --git a/api/platform.getCurrentValidators.mainnet.sh b/api/platform.getCurrentValidators.mainnet.sh
index fba79f6..07c0098 100755
--- a/api/platform.getCurrentValidators.mainnet.sh
+++ b/api/platform.getCurrentValidators.mainnet.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Note: The bootstrapping process takes approximately 50–100 hours and requires 100 GB of space.
 # https://chainstack.com/avalanche-subnet-tutorial-series-running-a-local-avalanche-node-on-fuji-testnet/
diff --git a/api/platform.getCurrentValidators.sh b/api/platform.getCurrentValidators.sh
index 0e0f743..934033b 100755
--- a/api/platform.getCurrentValidators.sh
+++ b/api/platform.getCurrentValidators.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Note: The bootstrapping process takes approximately 50–100 hours and requires 100 GB of space.
 # https://chainstack.com/avalanche-subnet-tutorial-series-running-a-local-avalanche-node-on-fuji-testnet/
diff --git a/api/platform.getPendingValidators.sh b/api/platform.getPendingValidators.sh
index 8c9402d..e22ec5f 100755
--- a/api/platform.getPendingValidators.sh
+++ b/api/platform.getPendingValidators.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Note: The bootstrapping process takes approximately 50–100 hours and requires 100 GB of space.
 # https://chainstack.com/avalanche-subnet-tutorial-series-running-a-local-avalanche-node-on-fuji-testnet/
diff --git a/api/platform.getSubnets.sh b/api/platform.getSubnets.sh
index 3fde414..27d7447 100755
--- a/api/platform.getSubnets.sh
+++ b/api/platform.getSubnets.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # Note: The bootstrapping process takes approximately 50–100 hours and requires 100 GB of space.
 # https://chainstack.com/avalanche-subnet-tutorial-series-running-a-local-avalanche-node-on-fuji-testnet/
diff --git a/api/platform.getValidatorsAt.sh b/api/platform.getValidatorsAt.sh
index 66ee968..9983740 100755
--- a/api/platform.getValidatorsAt.sh
+++ b/api/platform.getValidatorsAt.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 SUBNET_ID="$1"
 
diff --git a/api/platform.validatedBy.sh b/api/platform.validatedBy.sh
index 236114c..d50f0b8 100755
--- a/api/platform.validatedBy.sh
+++ b/api/platform.validatedBy.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 BLOCKCHAIN_ID="$1"
 
diff --git a/api/platform.validates.sh b/api/platform.validates.sh
index a41d4a7..153a9a1 100755
--- a/api/platform.validates.sh
+++ b/api/platform.validates.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 SUBNET_ID="$1"
 
diff --git a/chains/backup-validator.sh b/chains/backup-validator.sh
index a690c58..8ecf490 100755
--- a/chains/backup-validator.sh
+++ b/chains/backup-validator.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+set -eu
 
 # Backup Avalanche validator
 
diff --git a/chains/devnet/README.md b/chains/devnet/README.md
new file mode 100644
index 0000000..a061e9d
--- /dev/null
+++ b/chains/devnet/README.md
@@ -0,0 +1,21 @@
+# DEVELOPMENT ONLY
+
+> ⚠️ **WARNING**: This directory contains devnet (development network) configuration files. Do NOT use these files for production (mainnet/testnet) deployments.
+
+## Chain ID
+
+- **Devnet chain ID**: `10509`
+- **Testnet chain ID**: `10508`
+- **Mainnet chain ID**: `10507`
+
+Verify the chain ID in deployment scripts before proceeding. Using the wrong genesis file could result in funds allocated to the wrong address or network.
+
+## Token Allocation
+
+The devnet genesis allocates a large token balance for development and testing purposes only. This allocation is intentionally disproportionate and must never be used in production.
+
+## Files
+
+| File | Description |
+|------|-------------|
+| `genesis.json` | Devnet genesis configuration (DEVELOPMENT ONLY, chain ID 10509) |
diff --git a/chains/install-subnet-cli.sh b/chains/install-subnet-cli.sh
index 9b01c83..fa25f1a 100755
--- a/chains/install-subnet-cli.sh
+++ b/chains/install-subnet-cli.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+set -euo pipefail
 VERSION=0.0.2 # Populate latest here
 
 GOARCH=$(go env GOARCH)
diff --git a/chains/update-validator-mainnet.sh b/chains/update-validator-mainnet.sh
index f740697..e41f455 100755
--- a/chains/update-validator-mainnet.sh
+++ b/chains/update-validator-mainnet.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 AVALANCHEGO_PREVIOUS_VERSION="1.10.7"
 AVALANCHEGO_VERSION="1.10.11"
@@ -24,8 +25,16 @@ download_sunbet_evm() {
 
 update_subnet_evm() {
     echo "Step: update_subnet_evm"
+    EXPECTED_CHECKSUM="$(curl -sL https://github.com/ava-labs/subnet-evm/releases/download/v${SUBNET_EVM_VERSION}/subnet-evm_${SUBNET_EVM_VERSION}_checksums.txt | grep "subnet-evm_${SUBNET_EVM_VERSION}_linux_amd64.tar.gz" | awk '{print $1}')"
+    ACTUAL_CHECKSUM="$(sha256sum subnet-evm_${SUBNET_EVM_VERSION}_linux_amd64.tar.gz | awk '{print $1}')"
+    if [ "${EXPECTED_CHECKSUM}" != "${ACTUAL_CHECKSUM}" ]; then
+        echo "ERROR: Checksum mismatch for subnet-evm tarball. Aborting installation."
+        echo "  Expected: ${EXPECTED_CHECKSUM}"
+        echo "  Actual:   ${ACTUAL_CHECKSUM}"
+        exit 1
+    fi
+    echo "Checksum verified: ${ACTUAL_CHECKSUM}"
     cp subnet-evm-${SUBNET_EVM_VERSION}/subnet-evm ~/.avalanchego/plugins/${VM_ID}
-    sha256sum subnet-evm-${SUBNET_EVM_VERSION}/subnet-evm ~/.avalanchego/plugins/${VM_ID}
 }
 
 show_validator_files() {
diff --git a/chains/update-validator-testnet.sh b/chains/update-validator-testnet.sh
index 6f2c22d..ef3f6f6 100755
--- a/chains/update-validator-testnet.sh
+++ b/chains/update-validator-testnet.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 AVALANCHEGO_PREVIOUS_VERSION="1.10.7"
 AVALANCHEGO_VERSION="1.10.11"
@@ -24,8 +25,16 @@ download_sunbet_evm() {
 
 update_subnet_evm() {
     echo "Step: update_subnet_evm"
+    EXPECTED_CHECKSUM="$(curl -sL https://github.com/ava-labs/subnet-evm/releases/download/v${SUBNET_EVM_VERSION}/subnet-evm_${SUBNET_EVM_VERSION}_checksums.txt | grep "subnet-evm_${SUBNET_EVM_VERSION}_linux_amd64.tar.gz" | awk '{print $1}')"
+    ACTUAL_CHECKSUM="$(sha256sum subnet-evm_${SUBNET_EVM_VERSION}_linux_amd64.tar.gz | awk '{print $1}')"
+    if [ "${EXPECTED_CHECKSUM}" != "${ACTUAL_CHECKSUM}" ]; then
+        echo "ERROR: Checksum mismatch for subnet-evm tarball. Aborting installation."
+        echo "  Expected: ${EXPECTED_CHECKSUM}"
+        echo "  Actual:   ${ACTUAL_CHECKSUM}"
+        exit 1
+    fi
+    echo "Checksum verified: ${ACTUAL_CHECKSUM}"
     cp subnet-evm-${SUBNET_EVM_VERSION}/subnet-evm ~/.avalanchego/plugins/${VM_ID}
-    sha256sum subnet-evm-${SUBNET_EVM_VERSION}/subnet-evm ~/.avalanchego/plugins/${VM_ID}
 }
 
 show_validator_files() {
diff --git a/genesis/README.md b/genesis/README.md
new file mode 100644
index 0000000..84e126f
--- /dev/null
+++ b/genesis/README.md
@@ -0,0 +1,21 @@
+# Genesis Files
+
+This directory contains historical and reference genesis configurations for the Numbers Network. The canonical genesis files reside in `chains/<network>/`.
+
+## Chain IDs
+
+| Network | Chain ID |
+|---------|----------|
+| Mainnet | `10507`  |
+| Testnet | `10508`  |
+| Devnet  | `10509`  |
+
+## Files
+
+| File | Network | Chain ID | Description |
+|------|---------|----------|-------------|
+| `genesis.json` | Testnet | 10508 | Base testnet genesis configuration |
+| `genesis-nativecoin-feemgr.json` | Testnet | 10508 | Testnet genesis with native coin minter and fee manager |
+| `genesis-nativecoin-feemgr-feerecv.json` | Testnet | 10508 | Testnet genesis with native coin minter, fee manager, and fee receiver |
+
+> ⚠️ These files use the **testnet** chain ID (10508). For production deployments, always use the genesis files in `chains/mainnet/`. Verify the chain ID before deploying.
diff --git a/rpc/rpc_test.py b/rpc/rpc_test.py
index c3561e8..2f453cc 100644
--- a/rpc/rpc_test.py
+++ b/rpc/rpc_test.py
@@ -2,6 +2,7 @@
 
 import requests
 import json
+from requests.exceptions import ConnectionError, Timeout, SSLError
 
 
 MAINNET_RPC_URL = "https://mainnetrpc.num.network"
@@ -11,14 +12,24 @@
 
 
 def test_connectivity(rpc_url):
+    payload = {
+        "jsonrpc": "2.0",
+        "method": "web3_clientVersion",
+        "params": [],
+        "id": 1
+    }
     try:
-        response = requests.get(rpc_url)
+        response = requests.post(rpc_url, json=payload, verify=True)
         if response.status_code == 200:
             print("Node is reachable, HTTP Status Code: 200")
         else:
             print(f"Node is not reachable, HTTP Status Code: {response.status_code}")
-    except Exception as e:
-        print(f"Connection failed, Error: {str(e)}")
+    except SSLError as e:
+        print(f"TLS/SSL error: {str(e)}")
+    except ConnectionError as e:
+        print(f"Connection failed: {str(e)}")
+    except Timeout as e:
+        print(f"Request timed out: {str(e)}")
 
 
 def test_functionality(rpc_url):
@@ -30,11 +41,17 @@ def test_functionality(rpc_url):
     }
 
     try:
-        response = requests.post(rpc_url, json=payload)
+        response = requests.post(rpc_url, json=payload, verify=True)
         response_data = response.json()
         print("RPC request successful, Response Data:", response_data)
-    except Exception as e:
-        print(f"RPC request failed, Error: {str(e)}")
+    except SSLError as e:
+        print(f"TLS/SSL error: {str(e)}")
+    except ConnectionError as e:
+        print(f"RPC request failed, Connection error: {str(e)}")
+    except Timeout as e:
+        print(f"RPC request timed out: {str(e)}")
+    except ValueError as e:
+        print(f"RPC response parse error: {str(e)}")
 
 
 def test_chain_id(rpc_url, chain_id):
@@ -45,11 +62,17 @@ def test_chain_id(rpc_url, chain_id):
     }
 
     try:
-        response = requests.post(rpc_url, json=payload)
+        response = requests.post(rpc_url, json=payload, verify=True)
         response_data = response.json()
         print("RPC request successful, Response Data:", response_data)
-    except Exception as e:
-        print(f"RPC request failed, Error: {str(e)}")
+    except SSLError as e:
+        print(f"TLS/SSL error: {str(e)}")
+    except ConnectionError as e:
+        print(f"RPC request failed, Connection error: {str(e)}")
+    except Timeout as e:
+        print(f"RPC request timed out: {str(e)}")
+    except ValueError as e:
+        print(f"RPC response parse error: {str(e)}")
 
 
 if __name__ == '__main__':
diff --git a/subnet-cli/install-subnet-cli.sh b/subnet-cli/install-subnet-cli.sh
index 9b01c83..fa25f1a 100755
--- a/subnet-cli/install-subnet-cli.sh
+++ b/subnet-cli/install-subnet-cli.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+set -euo pipefail
 VERSION=0.0.2 # Populate latest here
 
 GOARCH=$(go env GOARCH)
diff --git a/subnet-cli/subnet-cli-add-subnet-validator-mainnet.sh b/subnet-cli/subnet-cli-add-subnet-validator-mainnet.sh
index 3c12b5d..23b28dc 100755
--- a/subnet-cli/subnet-cli-add-subnet-validator-mainnet.sh
+++ b/subnet-cli/subnet-cli-add-subnet-validator-mainnet.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-# Validator ID source: https://app.asana.com/0/1202305127727547/1202919355642524/f
+set -euo pipefail
+# Validator ID source: see internal task tracker
 
 NODE_ID="NodeID-BXTBUqX8gitUDtVam4fhRWGD1SfeHGoBx"
 SUBNET_ID="2gHgAgyDHQv7jzFg6MxU2yyKq5NZBpwFLFeP8xX2E3gyK1SzSQ"
diff --git a/subnet-cli/subnet-cli-add-subnet-validator-testnet.sh b/subnet-cli/subnet-cli-add-subnet-validator-testnet.sh
index e1abefd..97a541f 100755
--- a/subnet-cli/subnet-cli-add-subnet-validator-testnet.sh
+++ b/subnet-cli/subnet-cli-add-subnet-validator-testnet.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-# Validator ID source: https://app.asana.com/0/1202305127727547/1202919355642524/f
+set -euo pipefail
+# Validator ID source: see internal task tracker
 
 NODE_ID="NodeID-A2Z8m7egVLhKf1Qj14uvXadhExM5zrB7p"
 SUBNET_ID="81vK49Udih5qmEzU7opx3Zg9AnB33F2oqUTQKuaoWgCvFUWQe"
diff --git a/subnet-cli/subnet-cli-create-vmid.sh b/subnet-cli/subnet-cli-create-vmid.sh
index 3a7fca3..665f3ae 100755
--- a/subnet-cli/subnet-cli-create-vmid.sh
+++ b/subnet-cli/subnet-cli-create-vmid.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # https://docs.avax.network/subnets/create-a-fuji-subnet-subnet-cli#build-binary
 
diff --git a/subnet-cli/subnet-cli-status-blockchain.sh b/subnet-cli/subnet-cli-status-blockchain.sh
index 9a87251..9ae3e12 100755
--- a/subnet-cli/subnet-cli-status-blockchain.sh
+++ b/subnet-cli/subnet-cli-status-blockchain.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 
 # Numbers devnet
 BLOCKCHAIN_ID="$1"
diff --git a/subnet-cli/subnet-cli-wizard-mainnet.sh b/subnet-cli/subnet-cli-wizard-mainnet.sh
index 9a8fc89..6ecd736 100755
--- a/subnet-cli/subnet-cli-wizard-mainnet.sh
+++ b/subnet-cli/subnet-cli-wizard-mainnet.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # --node-ids: If you have multiple nodes, use comma to separate them.
 #             Ex: NodeID-8CGJYaRLChC79CCRnvd7sh5eB9E9L9dVF,NodeID-24WK7qiKXAumya1kKEktwj2ubBbRyq5UW
diff --git a/subnet-cli/subnet-cli-wizard.sh b/subnet-cli/subnet-cli-wizard.sh
index bdf42e3..9ca7741 100755
--- a/subnet-cli/subnet-cli-wizard.sh
+++ b/subnet-cli/subnet-cli-wizard.sh
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 #
 # --node-ids: If you have multiple nodes, use comma to separate them.
 #             Ex: NodeID-8CGJYaRLChC79CCRnvd7sh5eB9E9L9dVF,NodeID-24WK7qiKXAumya1kKEktwj2ubBbRyq5UW