Add utils fn

Add utils functions that help convert number to token precision.

src/hooks/tbtc/useSubscribeToRedemptionRequestedEvent.ts

@@ -6,6 +6,7 @@ import { useBridgeContract } from "./useBridgeContract"
 import { tbtcSlice } from "../../store/tbtc"
 import { BigNumber, Event } from "ethers"
 import { useThreshold } from "../../contexts/ThresholdContext"
+import { fromSatoshiToTokenPrecision } from "../../threshold-ts/utils"
 
 export const useSubscribeToRedemptionRequestedEvent = () => {
   const contract = useBridgeContract()
@@ -37,7 +38,7 @@ export const useSubscribeToRedemptionRequestedEvent = () => {
         tbtcSlice.actions.redemptionRequested({
           // TODO: Take into account fees, see
           // https://github.com/threshold-network/token-dashboard/pull/569
-          amount: requestedAmount.mul(BigNumber.from(10).pow(10)).toString(),
+          amount: fromSatoshiToTokenPrecision(requestedAmount).toString(),
           txHash: event.transactionHash,
           redemptionKey,
           blockNumber: event.blockNumber,

src/threshold-ts/tbtc/index.ts

@@ -19,6 +19,7 @@ import {
   isSameETHAddress,
   AddressZero,
   isPayToScriptHashTypeAddress,
+  fromSatoshiToTokenPrecision,
 } from "../utils"
 import {
   Client,
@@ -883,7 +884,7 @@ export class TBTC implements ITBTC {
         // handled sucesfully the `getRedemptionRequest` returns `0`. The
         // `amount` in event is in satoshi, so here we convert to token
         // precision.
-        amount: this._satoshiMultiplier.mul(event.amount).toString(),
+        amount: fromSatoshiToTokenPrecision(event.amount).toString(),
         activityKey: redemptionKey,
         bridgeProcess: "unmint",
         blockNumber: event.blockNumber,

src/threshold-ts/utils/bitcoin.ts

@@ -12,6 +12,8 @@ import {
   validate,
 } from "bitcoin-address-validation"
 
+export const BITCOIN_PRECISION = 8
+
 export const isValidBtcAddress = (
   address: string,
   network: BitcoinNetwork = BitcoinNetwork.Mainnet

src/threshold-ts/utils/chain.ts

@@ -1,4 +1,7 @@
+import { BigNumberish } from "ethers"
 import { defaultAbiCoder } from "ethers/lib/utils"
+import { BITCOIN_PRECISION } from "./bitcoin"
+import { to1ePrecision } from "./math"
 
 export const isValidType = (paramType: string, value: string) => {
   try {
@@ -8,3 +11,10 @@ export const isValidType = (paramType: string, value: string) => {
     return false
   }
 }
+
+export const fromSatoshiToTokenPrecision = (
+  value: BigNumberish,
+  tokenPrecision: number = 18
+) => {
+  return to1ePrecision(value, tokenPrecision - BITCOIN_PRECISION)
+}

src/threshold-ts/utils/math.ts

@@ -18,3 +18,12 @@ export const min = (a: BigNumberish, b: BigNumberish) => {
 export const max = (a: BigNumberish, b: BigNumberish) => {
   return compare(a, b, "gt")
 }
+
+export function to1ePrecision(n: BigNumberish, precision: number): BigNumber {
+  const decimalMultiplier = BigNumber.from(10).pow(precision)
+  return BigNumber.from(n).mul(decimalMultiplier)
+}
+
+export function to1e18(n: BigNumberish): BigNumber {
+  return to1ePrecision(n, 18)
+}