diff --git a/migrations/constructorArgs.json b/migrations/constructorArgs.json
new file mode 100644
index 000000000..a33db013e
--- /dev/null
+++ b/migrations/constructorArgs.json
@@ -0,0 +1,5 @@
+{
+    "ten:testnet": {
+        "WitnetRequestBoardTrustableObscuro": "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"
+    }
+}
\ No newline at end of file
diff --git a/migrations/scripts/1_deployer.js b/migrations/scripts/1_deployer.js
index dff93b034..d4a97e3ac 100644
--- a/migrations/scripts/1_deployer.js
+++ b/migrations/scripts/1_deployer.js
@@ -3,7 +3,7 @@ const utils = require("../../src/utils")
 const WitnetDeployer = artifacts.require("WitnetDeployer")
 
 module.exports = async function (deployer, network, [,,, master]) {
-  const addresses = await utils.readAddresses()
+  const addresses = await utils.readJsonFromFile("./migrations/addresses.json")
   if (!addresses[network]) addresses[network] = {};
 
   const factoryAddr = addresses[network]?.WitnetDeployer || addresses?.default?.WitnetDeployer || ""
@@ -15,7 +15,7 @@ module.exports = async function (deployer, network, [,,, master]) {
     const factory = await WitnetDeployer.deployed()
     addresses[network].WitnetDeployer = factory.address
     if (!utils.isDryRun(network)) {
-      await utils.saveAddresses(addresses)
+      await utils.overwriteJsonFile("./migrations/addresses.json", addresses)
     }
   } else {
     const factory = await WitnetDeployer.at(factoryAddr)
diff --git a/migrations/scripts/2_libs.js b/migrations/scripts/2_libs.js
index cfac8690b..332711f19 100644
--- a/migrations/scripts/2_libs.js
+++ b/migrations/scripts/2_libs.js
@@ -4,7 +4,7 @@ const utils = require("../../src/utils")
 const WitnetDeployer = artifacts.require("WitnetDeployer")
 
 module.exports = async function (_, network, [, from]) {
-  const addresses = await utils.readAddresses()
+  const addresses = await utils.readJsonFromFile("./migrations/addresses.json")
   if (!addresses[network]) addresses[network] = {};
 
   const targets = settings.getArtifacts(network)
@@ -39,7 +39,7 @@ module.exports = async function (_, network, [, from]) {
         process.exit(1)
       }
       if (!utils.isDryRun(network)) {
-        await utils.saveAddresses(addresses)
+        await utils.overwriteJsonFile("./migrations/addresses.json", addresses)
       }
     } else {
       utils.traceHeader(`Skipped '${key}'`)
diff --git a/migrations/scripts/3_core.js b/migrations/scripts/3_core.js
index 35a059403..82e44bd7c 100644
--- a/migrations/scripts/3_core.js
+++ b/migrations/scripts/3_core.js
@@ -65,7 +65,7 @@ module.exports = async function (_, network, [, from]) {
 async function deploy (specs) {
   const { from, key, libs, intrinsics, immutables, network, targets } = specs
   
-  const addresses = await utils.readAddresses()
+  const addresses = await utils.readJsonFromFile("./migrations/addresses.json")
   if (!addresses[network]) addresses[network] = {};
 
   const selection = utils.getWitnetArtifactsFromArgs()
@@ -107,7 +107,9 @@ async function deploy (specs) {
     }
     // save addresses file if required
     if (!utils.isDryRun(network)) {
-      await utils.saveAddresses(addresses)
+      await utils.overwriteJsonFile("./migrations/addresses.json", addresses)
+      const args = {}; args[network] = {}; args[network][key] = constructorArgs.slice(2);
+      await utils.overwriteJsonFile("./migrations/constructorArgs.json", args)
     }
   } else {
     utils.traceHeader(`Skipped '${key}'`)
diff --git a/migrations/scripts/4_proxies.js b/migrations/scripts/4_proxies.js
index b4dedfe44..841b1dfc1 100644
--- a/migrations/scripts/4_proxies.js
+++ b/migrations/scripts/4_proxies.js
@@ -41,7 +41,7 @@ module.exports = async function (_, network, [, from, reporter]) {
 async function deploy (target) {
   const { from, key, network, specs, targets } = target
   
-  const addresses = await utils.readAddresses(network)
+  const addresses = await utils.readJsonFromFile("./migrations/addresses.json")
   if (!addresses[network]) addresses[network] = {};
   
   const mutables = specs[key].mutables
@@ -89,7 +89,7 @@ async function deploy (target) {
       process.exit(1)
     }
     if (!utils.isDryRun(network)) {
-      await utils.saveAddresses(addresses)
+      await utils.overwriteJsonFile("./migrations/addresses.json", addresses)
     }
   } else {
     const oldAddr = await getProxyImplementation(from, proxyAddr)
diff --git a/migrations/scripts/5_apps.js b/migrations/scripts/5_apps.js
index a5f2cda3d..fdea12d1b 100644
--- a/migrations/scripts/5_apps.js
+++ b/migrations/scripts/5_apps.js
@@ -30,7 +30,7 @@ module.exports = async function (_, network, [, from,, master]) {
 async function deploy (specs) {
   const { from, gas, key, libs, intrinsics, immutables, network, targets, vanity } = specs
   
-  const addresses = await utils.readAddresses()
+  const addresses = await utils.readJsonFromFile("./migrations/addresses.json")
   if (!addresses[network]) addresses[network] = {};
   
   const artifact = artifacts.require(key)
@@ -69,7 +69,7 @@ async function deploy (specs) {
     }
     // save addresses file if required
     if (!utils.isDryRun(network)) {
-      await utils.saveAddresses(addresses)
+      await utils.overwriteJsonFile("./migrations/addresses.json", addresses)
     }
   } else {
     utils.traceHeader(`Skipped '${key}'`)
diff --git a/src/utils/index.js b/src/utils.js
similarity index 74%
rename from src/utils/index.js
rename to src/utils.js
index accb4fb32..0a71e0a88 100644
--- a/src/utils/index.js
+++ b/src/utils.js
@@ -2,9 +2,7 @@ const fs = require("fs")
 require("dotenv").config()
 const lockfile = require("proper-lockfile")
 const readline = require("readline")
-
-const traceHeader = require("./traceHeader")
-const traceTx = require("./traceTx")
+const web3 = require("web3")
 
 module.exports = {
   fromAscii,
@@ -16,8 +14,8 @@ module.exports = {
   isNullAddress,
   padLeft,
   prompt,
-  readAddresses,
-  saveAddresses,
+  readJsonFromFile,
+  overwriteJsonFile,
   traceHeader,
   traceTx,
 }
@@ -115,18 +113,33 @@ async function prompt (text) {
   return answer
 }
 
-async function readAddresses () {
-  const filename = "./migrations/witnet.addresses.json"
+async function readJsonFromFile (filename) {
   lockfile.lockSync(filename)
-  const addrs = JSON.parse(await fs.readFileSync(filename))
+  const json = JSON.parse(await fs.readFileSync(filename))
   lockfile.unlockSync(filename)
-  return addrs || {}
+  return json|| {}
 }
 
-async function saveAddresses (addrs) {
-  const filename = "./migrations/witnet.addresses.json"
+async function overwriteJsonFile (filename, extra) {
   lockfile.lockSync(filename)
-  const json = { ...JSON.parse(fs.readFileSync(filename)), ...addrs };
+  const json = { ...JSON.parse(fs.readFileSync(filename)), ...extra };
   fs.writeFileSync(filename, JSON.stringify(json, null, 4), { flag: "w+" })
   lockfile.unlockSync(filename)
 }
+
+function traceHeader (header) {
+  console.log("")
+  console.log("  ", header)
+  console.log("  ", `${"-".repeat(header.length)}`)
+}
+
+function traceTx (tx) {
+  console.info("  ", "> transaction hash: ", tx.receipt.transactionHash)
+  console.info("  ", "> gas used:         ", tx.receipt.gasUsed.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ","))
+  console.info("  ", "> gas price:        ", tx.receipt.effectiveGasPrice / 10 ** 9, "gwei")
+  console.info("  ", "> total cost:       ", web3.utils.fromWei(
+    BigInt(tx.receipt.gasUsed * tx.receipt.effectiveGasPrice).toString(),
+    "ether"
+  ), "ETH"
+  )
+}
diff --git a/src/utils/traceHeader.js b/src/utils/traceHeader.js
deleted file mode 100644
index de350909d..000000000
--- a/src/utils/traceHeader.js
+++ /dev/null
@@ -1,5 +0,0 @@
-module.exports = function (header) {
-  console.log("")
-  console.log("  ", header)
-  console.log("  ", `${"-".repeat(header.length)}`)
-}
diff --git a/src/utils/traceTx.js b/src/utils/traceTx.js
deleted file mode 100644
index 2a8f73679..000000000
--- a/src/utils/traceTx.js
+++ /dev/null
@@ -1,12 +0,0 @@
-const web3 = require("web3")
-
-module.exports = function (tx) {
-  console.info("  ", "> transaction hash: ", tx.receipt.transactionHash)
-  console.info("  ", "> gas used:         ", tx.receipt.gasUsed.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ","))
-  console.info("  ", "> gas price:        ", tx.receipt.effectiveGasPrice / 10 ** 9, "gwei")
-  console.info("  ", "> total cost:       ", web3.utils.fromWei(
-    BigInt(tx.receipt.gasUsed * tx.receipt.effectiveGasPrice).toString(),
-    "ether"
-  ), "ETH"
-  )
-}