diff --git a/typescript/src/lib/bitcoin/tx.ts b/typescript/src/lib/bitcoin/tx.ts
index 2ad886155..da76eae56 100644
--- a/typescript/src/lib/bitcoin/tx.ts
+++ b/typescript/src/lib/bitcoin/tx.ts
@@ -102,26 +102,26 @@ export type BitcoinUtxo = BitcoinTxOutpoint & {
  */
 export interface BitcoinRawTxVectors {
   /**
-   * Transaction version as an un-prefixed hex string.
+   * Transaction version as a hex string.
    */
-  version: string
+  version: Hex
 
   /**
    * All transaction's inputs prepended by the number of transaction inputs,
-   * as an un-prefixed hex string.
+   * as a hex string.
    */
-  inputs: string
+  inputs: Hex
 
   /**
    * All transaction's outputs prepended by the number of transaction outputs,
-   * as an un-prefixed hex string.
+   * as a hex string.
    */
-  outputs: string
+  outputs: Hex
 
   /**
-   * Transaction locktime as an un-prefixed hex string.
+   * Transaction locktime as a hex string.
    */
-  locktime: string
+  locktime: Hex
 }
 
 /**
@@ -133,11 +133,11 @@ export interface BitcoinRawTxVectors {
 export function extractBitcoinRawTxVectors(
   rawTransaction: BitcoinRawTx
 ): BitcoinRawTxVectors {
-  const toHex = (bufferWriter: any): string => {
-    return bufferWriter.render().toString("hex")
+  const toHex = (bufferWriter: any): Hex => {
+    return Hex.from(bufferWriter.render())
   }
 
-  const getTxInputVector = (tx: Tx): string => {
+  const getTxInputVector = (tx: Tx): Hex => {
     const buffer = bufio.write()
     buffer.writeVarint(tx.ins.length)
     tx.ins.forEach((input) => {
@@ -149,7 +149,7 @@ export function extractBitcoinRawTxVectors(
     return toHex(buffer)
   }
 
-  const getTxOutputVector = (tx: Tx): string => {
+  const getTxOutputVector = (tx: Tx): Hex => {
     const buffer = bufio.write()
     buffer.writeVarint(tx.outs.length)
     tx.outs.forEach((output) => {
@@ -159,13 +159,13 @@ export function extractBitcoinRawTxVectors(
     return toHex(buffer)
   }
 
-  const getTxVersion = (tx: Tx): string => {
+  const getTxVersion = (tx: Tx): Hex => {
     const buffer = bufio.write()
     buffer.writeU32(tx.version)
     return toHex(buffer)
   }
 
-  const getTxLocktime = (tx: Tx): string => {
+  const getTxLocktime = (tx: Tx): Hex => {
     const buffer = bufio.write()
     buffer.writeU32(tx.locktime)
     return toHex(buffer)
diff --git a/typescript/src/lib/ethereum/bridge.ts b/typescript/src/lib/ethereum/bridge.ts
index 0ca647525..fea20d000 100644
--- a/typescript/src/lib/ethereum/bridge.ts
+++ b/typescript/src/lib/ethereum/bridge.ts
@@ -234,18 +234,18 @@ export class EthereumBridge
     vault?: ChainIdentifier
   ): Promise<string> {
     const depositTxParam = {
-      version: `0x${depositTx.version}`,
-      inputVector: `0x${depositTx.inputs}`,
-      outputVector: `0x${depositTx.outputs}`,
-      locktime: `0x${depositTx.locktime}`,
+      version: depositTx.version.toPrefixedString(),
+      inputVector: depositTx.inputs.toPrefixedString(),
+      outputVector: depositTx.outputs.toPrefixedString(),
+      locktime: depositTx.locktime.toPrefixedString(),
     }
 
     const revealParam = {
       fundingOutputIndex: depositOutputIndex,
-      blindingFactor: `0x${deposit.blindingFactor}`,
-      walletPubKeyHash: `0x${deposit.walletPublicKeyHash}`,
-      refundPubKeyHash: `0x${deposit.refundPublicKeyHash}`,
-      refundLocktime: `0x${deposit.refundLocktime}`,
+      blindingFactor: deposit.blindingFactor.toPrefixedString(),
+      walletPubKeyHash: deposit.walletPublicKeyHash.toPrefixedString(),
+      refundPubKeyHash: deposit.refundPublicKeyHash.toPrefixedString(),
+      refundLocktime: deposit.refundLocktime.toPrefixedString(),
       vault: vault ? `0x${vault.identifierHex}` : constants.AddressZero,
     }
 
diff --git a/typescript/test/data/deposit-sweep.ts b/typescript/test/data/deposit-sweep.ts
index 69bda0baf..35b551e43 100644
--- a/typescript/test/data/deposit-sweep.ts
+++ b/typescript/test/data/deposit-sweep.ts
@@ -566,22 +566,24 @@ export const depositSweepProof: DepositSweepProofTestData = {
   },
   expectedSweepProof: {
     sweepTx: {
-      version: "01000000",
-      inputs:
+      version: Hex.from("01000000"),
+      inputs: Hex.from(
         "048f99b22593afdc4e3c08c7821151e801b2e9a16bf307c087a1b8c1f8459e4dea0" +
-        "0000000c9483045022100bb54f2717647b2f2c5370b5f12b55e27f97a6e2009dcd2" +
-        "1fca08527df949e1fd022058bc3cd1dd739b89b9e4cda43b13bc59cfb15663b80cb" +
-        "fa3edb4539107bba35d012103989d253b17a6a0f41838b84ff0d20e8898f9d7b1a9" +
-        "8f2564da4cc29dcf8581d94c5c14934b98637ca318a4d6e7ca6ffd1690b8e77df63" +
-        "77508f9f0c90d000395237576a9148db50eb52063ea9d98b3eac91489a90f738986" +
-        "f68763ac6776a914e257eccafbc07c381642ce6e7e55120fb077fbed8804e025016" +
-        "2b175ac68fffffffffd337f1abd32f17566e17a3606714d981bb8982339805ebb84" +
-        "c881174cff44c80000000000ffffffff73a486cf5ca706f513b6bf170ed0e7465d5" +
-        "bbe2968b4c2a9a207ac0ebc68c5440000000000ffffffff78439e510ac6b659b529" +
-        "a608611a77ca05f00ca050648212e16447460ec048f50000000000ffffffff",
-      outputs:
-        "01789b0000000000001600148db50eb52063ea9d98b3eac91489a90f738986f6",
-      locktime: "00000000",
+          "0000000c9483045022100bb54f2717647b2f2c5370b5f12b55e27f97a6e2009dcd2" +
+          "1fca08527df949e1fd022058bc3cd1dd739b89b9e4cda43b13bc59cfb15663b80cb" +
+          "fa3edb4539107bba35d012103989d253b17a6a0f41838b84ff0d20e8898f9d7b1a9" +
+          "8f2564da4cc29dcf8581d94c5c14934b98637ca318a4d6e7ca6ffd1690b8e77df63" +
+          "77508f9f0c90d000395237576a9148db50eb52063ea9d98b3eac91489a90f738986" +
+          "f68763ac6776a914e257eccafbc07c381642ce6e7e55120fb077fbed8804e025016" +
+          "2b175ac68fffffffffd337f1abd32f17566e17a3606714d981bb8982339805ebb84" +
+          "c881174cff44c80000000000ffffffff73a486cf5ca706f513b6bf170ed0e7465d5" +
+          "bbe2968b4c2a9a207ac0ebc68c5440000000000ffffffff78439e510ac6b659b529" +
+          "a608611a77ca05f00ca050648212e16447460ec048f50000000000ffffffff"
+      ),
+      outputs: Hex.from(
+        "01789b0000000000001600148db50eb52063ea9d98b3eac91489a90f738986f6"
+      ),
+      locktime: Hex.from("00000000"),
     },
     sweepProof: {
       merkleProof: Hex.from(
diff --git a/typescript/test/data/redemption.ts b/typescript/test/data/redemption.ts
index a6c9be34d..7b0d6ef8a 100644
--- a/typescript/test/data/redemption.ts
+++ b/typescript/test/data/redemption.ts
@@ -669,18 +669,20 @@ export const redemptionProof: RedemptionProofTestData = {
   },
   expectedRedemptionProof: {
     redemptionTx: {
-      version: "01000000",
-      inputs:
+      version: Hex.from("01000000"),
+      inputs: Hex.from(
         "01e30b907d077893bd0ed819c66644027b1dd30e4d3f68bc51da7933f75bbb283d0" +
-        "100000000ffffffff",
-      outputs:
+          "100000000ffffffff"
+      ),
+      outputs: Hex.from(
         "051c3e0000000000001976a9144130879211c54df460e484ddf9aac009cb38ee748" +
-        "8ac242c0000000000001600144130879211c54df460e484ddf9aac009cb38ee74ac" +
-        "2600000000000017a9143ec459d0f3c29286ae5df5fcc421e2786024277e8764320" +
-        "0000000000022002086a303cdd2e2eab1d1679f1a813835dc5a1b65321077cdccaf" +
-        "08f98cbf04ca96ccfb1400000000001600148db50eb52063ea9d98b3eac91489a90" +
-        "f738986f6",
-      locktime: "00000000",
+          "8ac242c0000000000001600144130879211c54df460e484ddf9aac009cb38ee74ac" +
+          "2600000000000017a9143ec459d0f3c29286ae5df5fcc421e2786024277e8764320" +
+          "0000000000022002086a303cdd2e2eab1d1679f1a813835dc5a1b65321077cdccaf" +
+          "08f98cbf04ca96ccfb1400000000001600148db50eb52063ea9d98b3eac91489a90" +
+          "f738986f6"
+      ),
+      locktime: Hex.from("00000000"),
     },
     redemptionProof: {
       merkleProof: Hex.from(
diff --git a/typescript/test/lib/bitcoin.test.ts b/typescript/test/lib/bitcoin.test.ts
index 4684d98b2..5f54c4606 100644
--- a/typescript/test/lib/bitcoin.test.ts
+++ b/typescript/test/lib/bitcoin.test.ts
@@ -879,8 +879,8 @@ describe("Bitcoin", () => {
         depositSweepWithNoMainUtxoAndWitnessOutput.expectedSweep.transaction
       const decomposedTransaction = extractBitcoinRawTxVectors(rawTransaction)
 
-      expect(decomposedTransaction.version).to.be.equal("01000000")
-      expect(decomposedTransaction.inputs).to.be.equal(
+      expect(decomposedTransaction.version.toString()).to.be.equal("01000000")
+      expect(decomposedTransaction.inputs.toString()).to.be.equal(
         "02bc187be612bc3db8cfcdec56b75e9bc0262ab6eacfe27cc1a699bacd53e3d07400" +
           "000000c948304502210089a89aaf3fec97ac9ffa91cdff59829f0cb3ef852a468153" +
           "e2c0e2b473466d2e022072902bb923ef016ac52e941ced78f816bf27991c2b73211e" +
@@ -891,10 +891,10 @@ describe("Bitcoin", () => {
           "68ffffffffdc557e737b6688c5712649b86f7757a722dc3d42786f23b2fa826394df" +
           "ec545c0000000000ffffffff"
       )
-      expect(decomposedTransaction.outputs).to.be.equal(
+      expect(decomposedTransaction.outputs.toString()).to.be.equal(
         "01488a0000000000001600148db50eb52063ea9d98b3eac91489a90f738986f6"
       )
-      expect(decomposedTransaction.locktime).to.be.equal("00000000")
+      expect(decomposedTransaction.locktime.toString()).to.be.equal("00000000")
     })
   })
 
diff --git a/typescript/test/lib/ethereum.test.ts b/typescript/test/lib/ethereum.test.ts
index c7a69a2e9..801e77fe8 100644
--- a/typescript/test/lib/ethereum.test.ts
+++ b/typescript/test/lib/ethereum.test.ts
@@ -143,10 +143,10 @@ describe("Ethereum", () => {
         await bridgeHandle.revealDeposit(
           // Just short byte strings for clarity.
           {
-            version: "00000000",
-            inputs: "11111111",
-            outputs: "22222222",
-            locktime: "33333333",
+            version: Hex.from("00000000"),
+            inputs: Hex.from("11111111"),
+            outputs: Hex.from("22222222"),
+            locktime: Hex.from("33333333"),
           },
           2,
           {
@@ -192,10 +192,10 @@ describe("Ethereum", () => {
 
         await bridgeHandle.submitDepositSweepProof(
           {
-            version: "00000000",
-            inputs: "11111111",
-            outputs: "22222222",
-            locktime: "33333333",
+            version: Hex.from("00000000"),
+            inputs: Hex.from("11111111"),
+            outputs: Hex.from("22222222"),
+            locktime: Hex.from("33333333"),
           },
           {
             merkleProof: Hex.from("44444444"),
@@ -290,10 +290,10 @@ describe("Ethereum", () => {
 
         await bridgeHandle.submitRedemptionProof(
           {
-            version: "00000000",
-            inputs: "11111111",
-            outputs: "22222222",
-            locktime: "33333333",
+            version: Hex.from("00000000"),
+            inputs: Hex.from("11111111"),
+            outputs: Hex.from("22222222"),
+            locktime: Hex.from("33333333"),
           },
           {
             merkleProof: Hex.from("44444444"),