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Withdraw from Wallet - Self-Custody MPC Hot (Simple)

Overview

The simple withdrawal flow for self-custody MPC hot wallets enables you to build, sign, and send transactions, all in 1 call, using the BitGo JavaScript SDK. The simple flow suffices for most use cases. If you require more granular control, see the integration guide for the advanced flow.

The simple flow also supports sending to many recipients in 1 transaction, lowering the aggregate amount of blockchain fees when compared to creating multiple transactions. Sending to many aligns with the simple transaction flow, where in 1 call you build, sign, and send a half-signed transaction to BitGo. BitGo then uses the BitGo key to create a fully signed send-to-many transaction.

Just like with the advanced flow, you can configure wallet policies to require approvals on withdrawals. Once the transaction is half signed and approved, you send it to BitGo for final signing and broadcasting to the blockchain.

Prerequisites

1. Build, Sign, and Send Transaction

Build and sign the transaction and send it to BitGo, all in 1 call.

Additionally, you can create a send-to-many transaction that automatically invokes a batcher contract to send assets to multiple recipients. Currently, send-to-many transaction are available for ETH and MATIC and are limited to 200 recipients.

Endpoints:

  • cURL
  • JavaScript
  • JavaScript (send to many)
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export BITGO_EXPRESS_HOST="<YOUR_LOCAL_HOST>"
export COIN="<ASSET_ID>"
export WALLET_ID="<YOUR_WALLET_ID>"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"
export ADDRESS="<DESTINATION_ADDRESS>"
export AMOUNT="<AMOUNT_IN_BASE_UNITS>"

curl -X POST \
  http://$BITGO_EXPRESS_HOST:3080/api/v2/$COIN/wallet/$WALLET_ID/sendmany \
  -H 'Content-Type: application/json' \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '{
    "walletPassphrase": "'"$WALLET_PASSPHRASE"'",
    "recipients": [
        {
            "address": "'"$ADDRESS"'",
            "amount": "'"$AMOUNT"'"
        }
    ],
    "type": "transfer"
}'

Step Result

BitGo uses the data you pass to build a half-signed transaction. The transaction remains in a pending-approval status until a wallet admin approves it.

  • JSON
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{
  "transfer": {
    "entries": [
      {
        "address": "0x1a52b70e708f4aec9d92260aa035b3c71e51df84",
        "wallet": "665e33f768f9b4b1cc2ca87a6b87cdfb",
        "value": -1,
        "valueString": "-1"
      },
      {
        "address": "0xe2c5b494162bd9033283af31e35be27c6ee4bbf7",
        "value": 1,
        "valueString": "1"
      }
    ],
    "id": "665e352e29c225381225e8f5f74f429d",
    "coin": "hteth",
    "wallet": "665e33f768f9b4b1cc2ca87a6b87cdfb",
    "walletType": "hot",
    "enterprise": "66325011d4b1ff58feae3b311d669aae",
    "organization": "66325011d4b1ff58feae3b76c2d30987",
    "txid": "0x43f7bef95dd02eea33d447afc625908a429902fbd35a35f0da6b7befddc69d9b",
    "txidType": "transactionHash",
    "txRequestId": "2c7e52a6-a422-49d3-876c-c050fb4cbf36",
    "height": 999999999,
    "heightId": "999999999-665e352e29c225381225e8f5f74f429d",
    "date": "2024-06-03T21:27:10.071Z",
    "type": "send",
    "value": -1,
    "valueString": "-1",
    "intendedValueString": "-1",
    "baseValue": -1,
    "baseValueString": "-1",
    "baseValueWithoutFees": -1,
    "baseValueWithoutFeesString": "-1",
    "feeString": "0",
    "payGoFee": 0,
    "payGoFeeString": "0",
    "usd": 0,
    "usdRate": 3775.4311802956,
    "state": "signed",
    "instant": false,
    "isReward": false,
    "isUnlock": false,
    "isFee": false,
    "tags": [
      "665e33f768f9b4b1cc2ca87a6b87cdfb",
      "66325011d4b1ff58feae3b311d669aae"
    ],
    "history": [
      {
        "date": "2024-06-03T21:27:10.071Z",
        "action": "signed"
      },
      {
        "date": "2024-06-03T21:27:10.020Z",
        "user": "660d7c9fa6fbf0d00b415146cf70405a",
        "action": "created"
      }
    ],
    "signedDate": "2024-06-03T21:27:10.071Z",
    "coinSpecific": {
      "isMev": false
    },
    "metadata": [],
    "signedTime": "2024-06-03T21:27:10.071Z",
    "createdTime": "2024-06-03T21:27:10.020Z"
  },
  "txRequest": {
    "apiVersion": "full",
    "txRequestId": "2c7e52a6-a422-49d3-876c-c050fb4cbf36",
    "walletId": "665e33f768f9b4b1cc2ca87a6b87cdfb",
    "walletType": "hot",
    "version": 10,
    "enterpriseId": "66325011d4b1ff58feae3b311d669aae",
    "organizationId": "66325011d4b1ff58feae3b76c2d30987",
    "userId": "660d7c9fa6fbf0d00b415146cf70405a",
    "initiatedBy": "660d7c9fa6fbf0d00b415146cf70405a",
    "updatedBy": "660d7c9fa6fbf0d00b415146cf70405a",
    "policiesChecked": true,
    "date": "2024-06-03T21:27:10.203Z",
    "createdDate": "2024-06-03T21:27:01.066Z",
    "intent": {
      "intentType": "payment",
      "recipients": [
        {
          "address": {
            "address": "0xE2C5b494162bd9033283Af31e35Be27C6Ee4Bbf7"
          },
          "amount": {
            "value": "1",
            "symbol": "hteth"
          }
        }
      ],
      "feeOptions": {
        "baseFee": "1005178132",
        "gasUsedRatio": "0.2743939",
        "safeLowMinerTip": "10896128",
        "normalMinerTip": "22751361",
        "standardMinerTip": "498266940",
        "fastestMinerTip": "437486468",
        "ludicrousMinerTip": "1500000000",
        "maxPriorityFeePerGas": "498266940",
        "maxFeePerGas": "2508623204"
      },
      "senderAddressIndex": 0
    },
    "intents": [
      {
        "intentType": "payment",
        "recipients": [
          {
            "address": {
              "address": "0xE2C5b494162bd9033283Af31e35Be27C6Ee4Bbf7"
            },
            "amount": {
              "value": "1",
              "symbol": "hteth"
            }
          }
        ],
        "feeOptions": {
          "baseFee": "1005178132",
          "gasUsedRatio": "0.2743939",
          "safeLowMinerTip": "10896128",
          "normalMinerTip": "22751361",
          "standardMinerTip": "498266940",
          "fastestMinerTip": "437486468",
          "ludicrousMinerTip": "1500000000",
          "maxPriorityFeePerGas": "498266940",
          "maxFeePerGas": "2508623204"
        },
        "senderAddressIndex": 0
      }
    ],
    "state": "delivered",
    "latest": true,
    "transactions": [
      {
        "state": "delivered",
        "signatureShares": [],
        "commitmentShares": [],
        "unsignedTx": {
          "parsedTx": {
            "minerFee": "0",
            "spendAmount": "1",
            "spendAmounts": [
              {
                "coinName": "hteth",
                "amountString": "1"
              }
            ],
            "outputs": [
              {
                "address": "0xe2c5b494162bd9033283af31e35be27c6ee4bbf7",
                "wallets": [],
                "enterprises": [],
                "valueString": "1",
                "coinName": "hteth"
              }
            ],
            "inputs": [
              {
                "value": 1,
                "address": "0x1a52b70e708f4aec9d92260aa035b3c71e51df84",
                "valueString": "1"
              }
            ],
            "hasUnvalidatedData": false
          },
          "serializedTxHex": "02ed82426880841db2f33c8495868d648301637894e2c5b494162bd9033283af31e35be27c6ee4bbf70180c0808080",
          "signableHex": "02ea82426880841db2f33c8495868d648301637894e2c5b494162bd9033283af31e35be27c6ee4bbf70180c0",
          "feeInfo": {
            "fee": 136813501552000,
            "feeString": "136813501552000"
          },
          "derivationPath": "m"
        },
        "txHash": "0x43f7bef95dd02eea33d447afc625908a429902fbd35a35f0da6b7befddc69d9b",
        "signedTx": {
          "id": "0x43f7bef95dd02eea33d447afc625908a429902fbd35a35f0da6b7befddc69d9b",
          "tx": "0x02f86d82426880841db2f33c8495868d648301637894e2c5b494162bd9033283af31e35be27c6ee4bbf70180c080a0631c4464bcb29519ac7e3998955c1bda374d058868557661c3711d531cb37e62a04836e3cf75969a2ddd9c38981d1b6fade02733059544c74784f9a85e62da8719"
        },
        "updatedDate": "2024-06-03T21:27:10.215Z",
        "createdDate": "2024-06-03T21:27:01.072Z"
      }
    ],
    "messages": [],
    "isCanceled": false
  },
  "txid": "0x43f7bef95dd02eea33d447afc625908a429902fbd35a35f0da6b7befddc69d9b",
  "tx": "0x02f86d82426880841db2f33c8495868d648301637894e2c5b494162bd9033283af31e35be27c6ee4bbf70180c080a0631c4464bcb29519ac7e3998955c1bda374d058868557661c3711d531cb37e62a04836e3cf75969a2ddd9c38981d1b6fade02733059544c74784f9a85e62da8719",
  "status": "signed"
}

2. Approve Transaction (Optional)

Note: You can't approve your own transactions - another admin must approve them.

Endpoint: Update Pending Approval

  • cURL
  • JavaScript
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export BITGO_EXPRESS_HOST="<YOUR_LOCAL_HOST>"
export COIN="<ASSET_ID>"
export APPROVAL_ID="<APPROVAL_ID>"
export ACCESS_TOKEN="<YOUR_ACCESS_TOKEN>"
export WALLET_PASSPHRASE="<YOUR_WALLET_PASSPHRASE>"

curl -X PUT \
  https://$BITGO_EXPRESS_HOST:3080/api/v2/$COIN/pendingApprovals/$APPROVAL_ID \
  -H 'Content-Type: application/json' \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -d '{
    "state": "approved",
    "walletPassphrase": "'"$WALLET_PASSPHRASE"'"
  }'

Step Result

Once approved, BitGo rebuilds the half-signed transaction, applying the most up-to-date fees. BitGo then applies the final signature using the BitGo key and broadcasts the transaction to the blockchain.

  • JSON
  • JSON (send to many)
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{
  "id": "66b66201c45ab3125fc2d8a77b541d12",
  "coin": "tsol",
  "wallet": "669569464cec3c82c9b524faf0d42087",
  "wallets": [],
  "enterprise": "6672220dd9e61ce3d62e9e2d710cbd6f",
  "organization": "66722210d9e61ce3d62e9e997100b40a",
  "bitgoOrg": "BitGo Trust",
  "creator": "6672175d79369c8ad556deaca06abeea",
  "createDate": "2024-08-09T18:37:53.078Z",
  "approvedDate": "2024-08-09T18:38:47.371Z",
  "info": {
    "type": "transactionRequestFull",
    "transactionRequestFull": {
      "txRequestId": "0b259f23-d5a8-47d0-8666-47a3df07e244",
      "videoApprovers": [],
      "intent": {
        "intentType": "payment",
        "recipients": [
          {
            "address": {
              "address": "ESda41265eU4typ7Q7MFnBuaYUvV3rYsJyrGQzqo6YZn"
            },
            "amount": {
              "value": "500000",
              "symbol": "tsol"
            }
          }
        ]
      }
    }
  },
  "approvers": [],
  "state": "approved",
  "scope": "wallet",
  "userIds": [
    "6672175d79369c8ad556deaca06abeea",
    "6672292d89bd038e41cfb93b6ee482f1"
  ],
  "approvalsRequired": 1,
  "singleRunResults": [],
  "txRequestId": "0b259f23-d5a8-47d0-8666-47a3df07e244",
  "resolvers": [
    {
      "user": "6672292d89bd038e41cfb93b6ee482f1",
      "date": "2024-08-09T18:38:45.245Z",
      "resolutionType": "pending",
      "resolutionAction": "approve"
    }
  ],
  "policyEvaluationId": "8dc3ffdd-50ea-4ab6-9742-963a12eb4f6c",
  "actions": [
    {
      "id": "d0bcc3af-b341-4b1c-9c7e-723ff4bc7259",
      "status": "COMPLETE",
      "name": "approvals.customer.walletAdmin",
      "parameters": {
        "minRequired": "1",
        "userIds": []
      },
      "resolvers": [
        {
          "user": "6672292d89bd038e41cfb93b6ee482f1",
          "date": "2024-08-09T18:38:45.245Z",
          "resolutionType": "pending",
          "resolutionAction": "approve"
        }
      ],
      "approvers": []
    }
  ],
  "resolutionOrder": [
    {
      "actions": [
        "d0bcc3af-b341-4b1c-9c7e-723ff4bc7259"
      ]
    }
  ]
}

Next

You can view your completed withdrawal in BitGo or on a blockchain explorer.

See Also