diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 5b72a91..a57d4cc 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -1,3 +1,7 @@
+# Release 0.3.1.1
+
+* fix `Rts.utxo(addr)` implementaion in BCH-JS backen that was using old BITBOX REST endpoint.
+
 # Release 0.3.1.0
 
 This is a minor feature release focusing on SDK improvements. See migration guide in docs for details.
diff --git a/spedn-js/rts-bchjs/package.json b/spedn-js/rts-bchjs/package.json
index e8509b0..c1780e5 100644
--- a/spedn-js/rts-bchjs/package.json
+++ b/spedn-js/rts-bchjs/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@spedn/rts-bchjs",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Runtime System for Spedn Contracts with BCH-JS adapter",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -26,7 +26,7 @@
   ],
   "dependencies": {
     "@chris.troutner/bch-js": "^3.4.1",
-    "@spedn/rts": "^3.1.0"
+    "@spedn/rts": "^3.1.1"
   },
   "devDependencies": {
     "@types/node": "^14.0.27",
diff --git a/spedn-js/rts-bchjs/src/rts-bchjs.ts b/spedn-js/rts-bchjs/src/rts-bchjs.ts
index 52bda59..5df3fbb 100644
--- a/spedn-js/rts-bchjs/src/rts-bchjs.ts
+++ b/spedn-js/rts-bchjs/src/rts-bchjs.ts
@@ -1,5 +1,5 @@
 import BCHJS from "@chris.troutner/bch-js";
-import { Addresses, Crypto, Rts, RtsECPair, RtsTransactionBuilder, Script } from "@spedn/rts";
+import { Addresses, Crypto, Rts, RtsECPair, RtsTransactionBuilder, Script, UtxoResult } from "@spedn/rts";
 import Bitcoin from "bitcoincashjs-lib";
 
 const defaultConfigs: { [network: string]: any } = {
@@ -15,8 +15,17 @@ export class BchJsRts extends Rts {
     this.bchjs = bchjs || new BCHJS(defaultConfigs[network]);
   }
 
-  utxo(addr: any) {
-    return this.bchjs.Address.utxo(addr);
+  async utxo(addr: string): Promise<UtxoResult> {
+    const result = await this.bchjs.Electrumx.utxo(addr);
+    return {
+      ...result,
+      utxos: result.utxos.map((o: any) => ({
+        ...o,
+        txid: o.tx_hash,
+        vout: o.tx_pos,
+        satoshis: o.value
+      }))
+    };
   }
 
   ecPair(ecPair: Bitcoin.ECPair): RtsECPair {
diff --git a/spedn-js/rts-bchjs/src/types.d.ts b/spedn-js/rts-bchjs/src/types.d.ts
index 3cb3554..20aa823 100644
--- a/spedn-js/rts-bchjs/src/types.d.ts
+++ b/spedn-js/rts-bchjs/src/types.d.ts
@@ -4,6 +4,7 @@ declare module "@chris.troutner/bch-js" {
     constructor(conf: any);
     Address: any;
     Crypto: any;
+    Electrumx: any;
     Script: any;
     Mnemonic: any;
     HDNode: any;
diff --git a/spedn-js/rts-bchjs/yarn.lock b/spedn-js/rts-bchjs/yarn.lock
index 535dc0a..3f15314 100644
--- a/spedn-js/rts-bchjs/yarn.lock
+++ b/spedn-js/rts-bchjs/yarn.lock
@@ -252,10 +252,10 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.2.tgz#26520bf09abe4a5644cd5414e37125a8954241dd"
   integrity sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==
 
-"@spedn/rts@^3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.0.tgz#090118f57964a7e2c2ac6d9d61a47637ea10af5a"
-  integrity sha512-fYAGRiMKPE/UZjNTkwLYv3Nvry740H15yeC5+oNIYAT85SP3E3mY9VFyxjK6EUWFtTB+Px+/N73t0HgqBLs37w==
+"@spedn/rts@^3.1.1":
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.1.tgz#b45b2cb49df994f448aca5c490696f942544699d"
+  integrity sha512-r3YjixGB/zLXq/kcnypx6oKSVm2fri+LW+PrExB3u/5Tu0gorUieHd33KWaKaSWYam3VKTBeyzPADoAq96EAtw==
   dependencies:
     lodash "^4.17.20"
     varuint-bitcoin "1.1.2"
diff --git a/spedn-js/rts-bitbox/package.json b/spedn-js/rts-bitbox/package.json
index 611c017..e355130 100644
--- a/spedn-js/rts-bitbox/package.json
+++ b/spedn-js/rts-bitbox/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@spedn/rts-bitbox",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Runtime System for Spedn Contracts with BITBOX adapter",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -25,7 +25,7 @@
     "bitcoincash:qrc2jhalczuka8q3dvk0g8mnkqx79wxp9gvvqvg7qt"
   ],
   "dependencies": {
-    "@spedn/rts": "^3.1.0",
+    "@spedn/rts": "^3.1.1",
     "bitbox-sdk": "^8.11.2"
   },
   "devDependencies": {
diff --git a/spedn-js/rts-bitbox/src/rts-bitbox.ts b/spedn-js/rts-bitbox/src/rts-bitbox.ts
index cf7e821..72044d4 100644
--- a/spedn-js/rts-bitbox/src/rts-bitbox.ts
+++ b/spedn-js/rts-bitbox/src/rts-bitbox.ts
@@ -1,5 +1,6 @@
-import { Addresses, Crypto, Rts, RtsECPair, RtsTransactionBuilder, Script } from "@spedn/rts";
+import { Addresses, Crypto, Rts, RtsECPair, RtsTransactionBuilder, Script, UtxoResult } from "@spedn/rts";
 import { BITBOX, TREST_URL, TWS_URL } from "bitbox-sdk";
+import { AddressUtxoResult } from "bitcoin-com-rest";
 import Bitcoin from "bitcoincashjs-lib";
 
 const defaultConfigs: { [network: string]: any } = {
@@ -15,8 +16,8 @@ export class BitboxRts extends Rts {
     this.bitbox = bitbox || new BITBOX(defaultConfigs[network]);
   }
 
-  utxo(addr: any) {
-    return this.bitbox.Address.utxo(addr);
+  utxo(addr: string): Promise<UtxoResult> {
+    return this.bitbox.Address.utxo(addr) as any;
   }
 
   ecPair(ecPair: Bitcoin.ECPair): RtsECPair {
diff --git a/spedn-js/rts-bitbox/yarn.lock b/spedn-js/rts-bitbox/yarn.lock
index b81785e..701630f 100644
--- a/spedn-js/rts-bitbox/yarn.lock
+++ b/spedn-js/rts-bitbox/yarn.lock
@@ -213,10 +213,10 @@
   resolved "https://registry.yarnpkg.com/@istanbuljs/schema/-/schema-0.1.2.tgz#26520bf09abe4a5644cd5414e37125a8954241dd"
   integrity sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==
 
-"@spedn/rts@^3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.0.tgz#090118f57964a7e2c2ac6d9d61a47637ea10af5a"
-  integrity sha512-fYAGRiMKPE/UZjNTkwLYv3Nvry740H15yeC5+oNIYAT85SP3E3mY9VFyxjK6EUWFtTB+Px+/N73t0HgqBLs37w==
+"@spedn/rts@^3.1.1":
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.1.tgz#b45b2cb49df994f448aca5c490696f942544699d"
+  integrity sha512-r3YjixGB/zLXq/kcnypx6oKSVm2fri+LW+PrExB3u/5Tu0gorUieHd33KWaKaSWYam3VKTBeyzPADoAq96EAtw==
   dependencies:
     lodash "^4.17.20"
     varuint-bitcoin "1.1.2"
diff --git a/spedn-js/rts/package.json b/spedn-js/rts/package.json
index af1bf9a..2578887 100644
--- a/spedn-js/rts/package.json
+++ b/spedn-js/rts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@spedn/rts",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Runtime System for Spedn contracts.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/spedn-js/rts/src/contracts.ts b/spedn-js/rts/src/contracts.ts
index 958b6db..82ecc3f 100644
--- a/spedn-js/rts/src/contracts.ts
+++ b/spedn-js/rts/src/contracts.ts
@@ -79,7 +79,6 @@ export interface Utxo {
   amount: number;
   satoshis: number;
   height: number;
-  confirmations: number;
 }
 
 export interface Coin {
diff --git a/spedn-js/rts/src/rts.ts b/spedn-js/rts/src/rts.ts
index 7381fb6..8495679 100644
--- a/spedn-js/rts/src/rts.ts
+++ b/spedn-js/rts/src/rts.ts
@@ -1,11 +1,11 @@
-import { Module, ModuleFactory, PortableModule } from "./contracts";
+import { Module, ModuleFactory, PortableModule, Utxo } from "./contracts";
 
 export abstract class Rts {
   private moduleFactory: ModuleFactory;
   constructor(public readonly network: string = "mainnet") {
     this.moduleFactory = new ModuleFactory(this);
   }
-  abstract utxo(addr: any): any;
+  abstract utxo(addr: string): Promise<UtxoResult>;
   abstract ecPair(ecPair: any): RtsECPair;
   abstract get addresses(): Addresses;
   abstract get crypto(): Crypto;
@@ -18,6 +18,11 @@ export abstract class Rts {
   }
 }
 
+export interface UtxoResult {
+  success: boolean;
+  utxos: Utxo[];
+}
+
 export interface Addresses {
   fromOutputScript(script: Buffer, network: string): string;
   toHash160(addr: string): string;
diff --git a/spedn-js/sdk/package.json b/spedn-js/sdk/package.json
index ae5fcf9..4f0f445 100644
--- a/spedn-js/sdk/package.json
+++ b/spedn-js/sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@spedn/sdk",
-  "version": "3.1.0",
+  "version": "3.1.1",
   "description": "Spedn compiler SDK",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
@@ -28,7 +28,7 @@
   "author": "{o} Software",
   "license": "MIT",
   "dependencies": {
-    "@spedn/rts": "^3.1.0"
+    "@spedn/rts": "^3.1.1"
   },
   "devDependencies": {
     "@types/node": "^14.0.27",
diff --git a/spedn-js/sdk/yarn.lock b/spedn-js/sdk/yarn.lock
index da17e06..cd872ca 100644
--- a/spedn-js/sdk/yarn.lock
+++ b/spedn-js/sdk/yarn.lock
@@ -2,10 +2,10 @@
 # yarn lockfile v1
 
 
-"@spedn/rts@^3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.0.tgz#090118f57964a7e2c2ac6d9d61a47637ea10af5a"
-  integrity sha512-fYAGRiMKPE/UZjNTkwLYv3Nvry740H15yeC5+oNIYAT85SP3E3mY9VFyxjK6EUWFtTB+Px+/N73t0HgqBLs37w==
+"@spedn/rts@^3.1.1":
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.1.tgz#b45b2cb49df994f448aca5c490696f942544699d"
+  integrity sha512-r3YjixGB/zLXq/kcnypx6oKSVm2fri+LW+PrExB3u/5Tu0gorUieHd33KWaKaSWYam3VKTBeyzPADoAq96EAtw==
   dependencies:
     lodash "^4.17.20"
     varuint-bitcoin "1.1.2"
diff --git a/spedn-js/tests/src/rest.test.ts b/spedn-js/tests/src/rest.test.ts
new file mode 100644
index 0000000..8c9a35c
--- /dev/null
+++ b/spedn-js/tests/src/rest.test.ts
@@ -0,0 +1,25 @@
+import BCHJS from "@chris.troutner/bch-js";
+import { P2PKHFactory } from "@spedn/rts";
+import { BchJsRts } from "@spedn/rts-bchjs";
+import { BitboxRts } from "@spedn/rts-bitbox";
+import { BITBOX } from "bitbox-sdk";
+
+const bchjs = new BCHJS({ restURL: "https://testnet3.fullstack.cash/v3/" });
+const bitbox = new BITBOX({ restURL: "https://trest.bitcoin.com/v2/" });
+
+describe.each([
+  new BchJsRts("testnet", bchjs)
+  // new BitboxRts("testnet", bitbox) // tREST seems to be dysfunctional
+])("%s REST API", rts => {
+  it("can find coins", async () => {
+    const factory = new P2PKHFactory(rts);
+    // testnet : draw parade crater busy book swim soldier tragic exit feel top civil : m/44'/145'/0'/0/3
+    const account = factory.fromAddress("bchtest:qzca95r68adkek2we4jvws5dex6pwg3vt52mkhsqjg");
+    const [coin] = await account.findCoins("testnet");
+    expect(coin).toBeDefined();
+    expect(coin).toHaveProperty("utxo.txid");
+    expect(coin).toHaveProperty("utxo.vout");
+    expect(coin).toHaveProperty("utxo.satoshis");
+    expect(coin).toHaveProperty("utxo.height");
+  });
+});
diff --git a/spedn-js/tests/yarn.lock b/spedn-js/tests/yarn.lock
index 58d7bd5..255d329 100644
--- a/spedn-js/tests/yarn.lock
+++ b/spedn-js/tests/yarn.lock
@@ -564,27 +564,29 @@
     "@sinonjs/commons" "^1.7.0"
 
 "@spedn/rts-bchjs@../rts-bchjs":
-  version "1.0.0"
+  version "3.1.1"
   dependencies:
     "@chris.troutner/bch-js" "^3.4.1"
-    "@spedn/rts" "../rts"
+    "@spedn/rts" "^3.1.1"
 
 "@spedn/rts-bitbox@../rts-bitbox":
-  version "1.0.0"
+  version "3.1.1"
   dependencies:
-    "@spedn/rts" "../rts"
+    "@spedn/rts" "^3.1.1"
     bitbox-sdk "^8.11.2"
 
-"@spedn/rts@../rts":
-  version "3.1.0"
+"@spedn/rts@^3.1.1":
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/@spedn/rts/-/rts-3.1.1.tgz#b45b2cb49df994f448aca5c490696f942544699d"
+  integrity sha512-r3YjixGB/zLXq/kcnypx6oKSVm2fri+LW+PrExB3u/5Tu0gorUieHd33KWaKaSWYam3VKTBeyzPADoAq96EAtw==
   dependencies:
     lodash "^4.17.20"
     varuint-bitcoin "1.1.2"
 
 "@spedn/sdk@../sdk":
-  version "1.0.0"
+  version "3.1.1"
   dependencies:
-    "@spedn/rts" "../rts"
+    "@spedn/rts" "^3.1.1"
 
 "@transloadit/prettier-bytes@0.0.7":
   version "0.0.7"