diff --git a/.env.sample b/.env.sample
index de90b37..4ed09d7 100644
--- a/.env.sample
+++ b/.env.sample
@@ -1,2 +1,32 @@
-PRIVATE_KEY=
-CMC_KEY=
+# used to configure the code based on network see: hardhat.config.js
+BLOCKCHAIN_NETWORK=hardhat
+
+# coin market cap key to estimate the gas cost in unit tests
+BLOCKCHAIN_CMC_KEY=
+
+# scanner API key
+BLOCKCHAIN_SCANNER_KEY=
+
+# localhost settings
+BLOCKCHAIN_LOCALHOST_PRIVATE_KEY=
+BLOCKCHAIN_LOCALHOST_NAMESPACE_ADDRESS=
+BLOCKCHAIN_LOCALHOST_TOKEN_ADDRESS=
+BLOCKCHAIN_LOCALHOST_TREASURY_ADDRESS=
+BLOCKCHAIN_LOCALHOST_ECONOMY_ADDRESS=
+BLOCKCHAIN_LOCALHOST_VESTING_ADDRESS=
+
+# testnet settings
+BLOCKCHAIN_TESTNET_PRIVATE_KEY=
+BLOCKCHAIN_TESTNET_NAMESPACE_ADDRESS=
+BLOCKCHAIN_TESTNET_TOKEN_ADDRESS=
+BLOCKCHAIN_TESTNET_TREASURY_ADDRESS=
+BLOCKCHAIN_TESTNET_ECONOMY_ADDRESS=
+BLOCKCHAIN_TESTNET_VESTING_ADDRESS=
+
+# mainnet settings
+BLOCKCHAIN_MAINNET_PRIVATE_KEY=
+BLOCKCHAIN_MAINNET_NAMESPACE_ADDRESS=
+BLOCKCHAIN_MAINNET_TOKEN_ADDRESS=
+BLOCKCHAIN_MAINNET_TREASURY_ADDRESS=
+BLOCKCHAIN_MAINNET_ECONOMY_ADDRESS=
+BLOCKCHAIN_MAINNET_VESTING_ADDRESS=
\ No newline at end of file