7. Tax data for subaccounts

How to manage and use subaccount tax data

There are a few critical concepts to review when starting to review and manage your subaccount tax data:

  • Anchorage tax data overview
  • Critical transaction and cost basis considerations
  • Tax forms
  • Integration steps



Anchorage Digital tax data overview

As the qualified custodian (QC) for wealth managers we serve, it is our responsibility to ensure that the end clients who custody and trade with us (via their wealth managers) have the information they need to file their taxes.

There are 2 types of accounts that we perform tax reporting for:

  1. Taxable accounts (includes individual, trust, joint etc.)
  2. Individual Retirement Accounts (IRA)

HIFO account method

Anchorage Digital currently uses the HIFO accounting method, which is commonly used to calculate the cost basis of assets for tax purposes. This method assumes that the highest-priced units or shares are sold first when determining the cost basis of an asset when it is sold or disposed. This method can be configured differently, if needed.

Example: An investor purchases a digital asset on three different occasions:

  • Purchase 1: 10 BTC at $20k per BTC.
  • Purchase 2: 20 BTC at $22k per BTC.
  • Purchase 3: 15 BTC at $35k per BTC.

If the investor sells 25 BTC, the HIFO method determines the cost basis as follows:

  • The 15 BTC from purchase 3 is sold first, with a cost basis of $35k per BTC.
  • The remaining 10 BTC would be selected from purchase 2, with a cost basis of $22k per BTC.

Note: With HIFO, the investor assigns the highest purchase prices to the BTC sold, potentially resulting in a higher cost basis and lower taxable gains.

Taxbit partnership

Anchorage Digital has partnered with Taxbit to provide the wealth manager and their end clients with required tax data about their holdings and taxable transactions.

Partnering with Taxbit has helped Anchorage Digital to provide a wealth manager with best-in-class compliance features across tax and accounting.

“Taxbit and Anchorage Digital have always shared a similar commitment to building an industry-leading regulatory stack to drive crypto adoption and innovation. Joining forces is critical to give RIAs the compliance features they need to participate in the digital asset economy. We are proud to welcome clients of Anchorage Digital into the Taxbit ecosystem.”

—Lindsey Argalas, CEO of Taxbit

Tax transactions

There are 3 different types of transactions at Anchorage Digital:

  1. On-chain transactions: Asset movement on-chain.
    1. Note: These are not relevant to tax APIs.
  2. Subaccount transactions: Asset movement on the wealth manager's subaccount ledger at Anchorage Digital.
  3. Tax transactions: Any transaction with a taxable event.

There are currently three taxable subacccount transaction event types:

  1. DEPOSIT
  2. TRADE
  3. WITHDRAW

Cost basis

We automatically track the cost cost basis throughout the life-cycle of the asset on the platform. However, for assets deposited in-kind, we would require the Wealth Manager and end client to update the transaction's cost basis.

subaccountId & customerId

While the subaccountId terminology is native to Anchorage Digital's ledger (and abstracted away from true Blockchain wallets), our current integration with Taxbit maps each subaccountId with the Taxbit "Account Owner ID", which we map to the customerIdfrom our side.

This 1-1 subacccountId & "account owner ID" mapping gives us the most flexibility in terms of the use-cases we’d like to solve for.

Calling out a few reasons we opted for this approach:

  • Accurate and segregated tracking: 1-1 mapping allows easier visibility into trades done at Anchorage Digital and their cost-basis impact in Taxbit. This will be especially beneficial in the case of an internal or IRS audit where the impact of a specific strategy and decisions made by the strategy manager can be easily traced back to the Anchorage Digital account and trade it came from.
  • Portfolio management and tax-loss harvesting flexibility: This method also enables tax-loss harvesting within each individual account. If one strategy incurs losses, you can sell those assets within that account to realize the loss without unintentionally affecting the other accounts. This can be especially important if you imagine a situation where an wealth manager delegates management to several different managers, who likely only have visibility into their own book and base tax-loss harvesting decisions accordingly.

Tax terminology

TermOverviewNotes
Tax transactionThis data enables Taxbit to generate other critical tax data informationDiffers from subaccount or on-chain transactions
Gains/lossThis is the difference between the sale price of an asset and its cost basis—gains are typically taxable, while losses can offset gains and reduce taxable income.These are specified in SHORT_TERM and LONG_TERM and the applicable tax year for reference.
InventoryThis refers to the total quantity and cost basis of a specific asset type held by a subaccount which may consist of multiple tax lots, each with its own unique attributes.
Tax lotThis represents a specific group of units in an investment acquired at the same time and cost basis.Accurate tracking of tax lots is essential for proper tax gain or loss calculation when an asset is disposed.
Acquisition dateThis refers to the date when an individual gains control of an asset.

In the US, this date determines the holding period—long-term or short-term—for tax purposes.

Accurate determination of the original acquisition date is crucial, especially when assets are transferred.

Cost basisThe cost basis of an asset is determined by its value at the time of acquisition or the amount paid for the asset, and is essential for calculating gains or losses when the asset is disposed.
Cost basis methodTwo common methods for calculating and tracking the cost basis of digital assets are HIFO and last-in-first-out (LIFO).
Missing cost basisThis may occur when transferring assets into the deposit wallet for account funding.This information can be shared with Anchorage Digital and Taxbit via API.
Holding periodThis refers to the duration an asset is held before being sold. In the US, long-term assets held for over a year receive preferential tax treatment compared to short-term assets.
  • Long-term*: For US taxpayers, assets held for more than one year are considered long-term and subject to lower tax rates.
  • Short-term*: For US taxpayers, assets held for one year or less are considered short-term and subject to higher tax rates.
Realized gain/lossThese are gains or losses that are realized through the sale or disposition of an asset.
Unrealized gain/lossThese are gains or losses that accrue due to asset price fluctuation, but are not yet realized through a sale or disposition.



Critical transaction and cost basis considerations

Missing cost basis = null

  • We are treating the missing cost basis as null and not 0

Default cost basis is HIFO

  • Anchorage Digital will leverage the “highest-in, first-out” (HIFO) accounting method unless otherwise specified by the wealth manager or PC.
  • Taxbit offers HIFO, LIFO and FIFO out of the box and can be selected at the wealth manager-level to default all accounts to the same or can be overridden at the account level (e.g. wealth manager wants HIFO but PC wants FIFO). Individual lot selection for gains/loss calculation isn't currently available but is on the Taxbit H2 roadmap and we intend to support it after they make it available.
  • For 2025, we'll be back-filling cost-basis at least daily in the meantime but once Taxbit makes the transfers endpoint available, the cost-basis will be filled right after the trade so there won't be a delay in gains/loss calculation based on HIFO.

All tax data is at the subaccount-level.

  • Regardless of the account owners, all data will be tracked at the subaccount-level.

Trade rounding:

  • We get trades that cannot be settled out to the last decimal place.
  • This is an industry problem with trade confirms vs. tax data/ custody precision. You will need to account for this in their own internal reconciliation processes.
    • Example: If a PC trades $1000.005 on BTC but we can't settle the $0.005, we have to round that value to the nearest cent. This is known as "dust", when referring to a crypto asset.
    • The rounded value is what we store in the ledger, so the ledger balances to 0 once we do the settlement. However, we do report the full precision quantity values in the trade confirmations that we send to customers, and to Taxbit. So the values that the PCs see in trade confirmations and tax reporting will match, but they may be slightly different than the actual amount that the customers send/receive in settlement.



Tax data forms

Once annual tax forms are generated, Taxbit offers the ability to fetch these forms via API.

Account typeReporting typeOverviewIssuing deadlineSupported?
TaxableCost-basisUsing proceeds and cost-basis data per transaction to calculate gain/loss. Providing this data can be used by the end customer to fill-out form 8949 (per transaction gain/loss) AND Schedule D on form 1040 (total gains/losses).N/A but preferably by Feb 15th, 2025Supported
Taxable1099-BThis form reports proceeds from brokerage/trading transactions will be crucial for accurately reporting your clients' gains and losses.Jan 31st, 2025Supported
Taxable1099-MISCThis form reports miscellaneous income, which, for your clients, could include payments received in crypto for services, staking rewards, or income from mining, signaling potential tax obligations for them.Jan 31st, 2025Coming soon
Non-taxable1099-RThis form reports distributions from retirement accounts, which might be relevant to your clients who hold crypto in IRAs or other retirement plans, and could indicate they need to pay taxes on those distributions.Jan 31st, 2025Coming soon
Non-taxableForm 5498This form reports contributions to IRAs (including those that might hold crypto), which can help you track clients' activity and ensure they're adhering to contribution limits.June 2nd, 2025Coming soon

Note: This feature strictly pertains to the availability of tax-related data supported by Taxbit. Anchorage Digital does not perform tax reporting on behalf of the wealth manager or end clients, and is not providing tax forms at this time.




Testing flow

For sandbox testing, note that some tax testing may be limited due to lack of full trade -> settlement life-cycle for mainnet assets.

Step 1: Review your tax transactions

This endpoint is used to provide tax transaction data for each subaccount. Ensure these look accurate and determine if you are missing any cost basis data. These transactions are not on-chain but representative of taxable sub-account transactions.

  • Types: DEPOSIT, WITHDRAW, TRADE.
  • The transaction fee provides information on the trade fees incurred for a given trade transaction.
  • Some deposits may not contain cost basis data—please leverage update transaction cost basis to complete the information.
curl --request GET \
     --url https://api.anchorage-staging.com/v2/tax/transactions/1f4400ad-d990-45fb-8f56-2c359efd72a22 \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": [
        {
            "externalId": "dad566f7-d5e6-4bbf-a2ef-c092435163f9",
            "fee": {
                "assetType": "ETH",
                "costBasis": "3335.22",
                "quantity": "0.029983029605243432217"
            },
            "feeAsset": [
                {
                    "assetType": "ETH",
                    "costBasis": "3335.22",
                    "quantity": "0.029983029605243432217"
                }
            ],
            "id": "6159224d-db88-47a4-99ae-1e3b8aeed671",
            "received": {
                "assetType": "ETH",
                "costBasis": "3335.22",
                "quantity": "29.983029605243432217"
            },
            "receivedAsset": [
                {
                    "assetType": "ETH",
                    "costBasis": "3335.22",
                    "quantity": "29.983029605243432217"
                }
            ],
            "sent": {
                "assetType": "USD",
                "costBasis": "1",
                "quantity": "100000"
            },
            "sentAsset": [
                {
                    "assetType": "USD",
                    "costBasis": "1",
                    "quantity": "100000"
                }
            ],
            "transactionTime": "2024-03-22T17:48:57.237Z",
            "type": "TRADE"
        },
        

Step 2: Update missing cost basis data by tax transaction

This endpoint is used to update cost basis data based on the tax transactionId.

  • Please indicate the transaction type and the known assetType and quantity.
  • Only cost basis data can be updated—transaction asset and quantity cannot be updated.
curl --request PATCH \
     --url https://api.anchorage-staging.com/v2/tax/transaction/1f4400ad-d990-45fb-8f56-2c359efd72a22 \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "type": "DEPOSIT",
  "assetType": "BTC",
  "lots": [
    {
      "acquisitionDatetime": "2025-03-03T14:48:06.111Z",
      "quantity": "string",
      "cost": "string"
    }
  ],
  "acquisitionDatetime": "2025-03-03T14:48:06.111Z",
  "data": {
    "assetType": "BTC",
    "costBasis": "2500",
    "quantity": "1.0"
  }
}
{
  "data": {
    "transactionId": "9cd9f4d4-078b-4e44-a308-7662fec0f546"
  }
}

Step 3: View asset inventory data

Inventory refers to the total quantity of a specific type of asset held by an individual—consists of multiple individual tax lots, each with its own unique attributes.

curl --request GET \
     --url https://api.anchorage-staging.com/v2/tax/inventory/1f4400ad-d990-45fb-8f56-2c359efd72a22/LDO \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": {
        "summary": {
            "AverageUnitCost": "1.633895117039317318810783072486812",
            "assetType": "LDO",
            "costBasis": "46.8803541265509",
            "lots": [
                {
                    "acquisitionDatetime": "2025-01-21T15:28:17.611Z",
                    "cost": "5.000000000000000001571268446423286432",
                    "id": "164963b5-0bbd-505b-91c0-dbe8e309c900",
                    "quantity": "2.646830567706262384",
                    "unitCost": "1.889051781781781798"
                },
                {
                    "acquisitionDatetime": "2025-01-21T15:20:31.747Z",
                    "cost": "1.87858968297",
                    "id": "ee406c6f-a955-50bc-92bb-aee73bcd7ae5",
                    "quantity": "1",
                    "unitCost": "1.87858968297"
                },
                {
                    "acquisitionDatetime": "2025-02-17T19:53:30.922Z",
                    "cost": "9.9999999999999999977965520105258091",
                    "id": "b12fa385-4007-565a-a03f-615535c22667",
                    "quantity": "5.453056768558952005",
                    "unitCost": "1.83383383383383382"
                },
                {
                    "acquisitionDatetime": "2025-02-05T14:39:15.695Z",
                    "cost": "10.000000000000000001488067203984527312",
                    "id": "9027d450-a3c1-54c1-a594-05df65bd8c0a",
                    "quantity": "5.490162535519950236",
                    "unitCost": "1.821439699699699692"
                },
                {
                    "acquisitionDatetime": "2025-02-05T18:21:16.936Z",
                    "cost": "0.0017644435809",
                    "id": "766d3342-855c-5e80-82c9-2caf502ab3a0",
                    "quantity": "0.001",
                    "unitCost": "1.7644435809"
                },
                {
                    "acquisitionDatetime": "2025-02-07T19:00:13.613Z",
                    "cost": "10.000000000000000001366763526853032808",
                    "id": "41ce31ae-10e7-524f-8d75-de33d3d067ea",
                    "quantity": "6.160162561695276737",
                    "unitCost": "1.623333783783783784"
                },
                {
                    "acquisitionDatetime": "2025-02-28T18:01:54.544Z",
                    "cost": "9.99999999999999999604575163398692808",
                    "id": "ada26046-3edc-5cb7-af73-4c72d4d6b11a",
                    "quantity": "7.94117647058823528",
                    "unitCost": "1.259259259259259261"
                }
            ],
            "quantity": "28.692388904068676642",
            "totalQuantityMissingCostBasis": "0",
            "totalQuantityWithCostBasis": "28.692388904068676642"
        }
    }
}

Viewing your inventory summary can be used to view and manage gains and losses related to asset disposals. It calculates gains by tracking disposed tax lots based on your chosen accounting method.

curl --request GET \
     --url https://api.anchorage-staging.com/v2/tax/summary/inventory/1f4400ad-d990-45fb-8f56-2c359efd72a22/
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": [
        {
            "assetType": "SOL",
            "costBasis": "10.002517283800791293",
            "quantity": "0.048968461518597327",
            "quantityWithCostBasis": "0.048968461518597327",
            "quantityWithoutCostBasis": "0"
        },
        {
            "assetType": "ETH",
            "costBasis": "29.999999999999999002",
            "quantity": "0.012590000901477938",
            "quantityWithCostBasis": "0.010911660562946608",
            "quantityWithoutCostBasis": "0.00167834033853133"
        }
        
    ]
}

Step 4: Review cost basis

This can be used to fetch subaccount's breakdown of combined cost basis, proceeds and gains/losses.

curl --request GET \
     --url 'https://api.anchorage.com/v2/tax/gains/summary/32ee4b77-7f2a-4486-86f8-01c6bc8e4fda?startDateTime=2023-01-01T00:00:00Z&endDateTime=2025-03-01T23:59:59Z' \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": {
        "longTerm": {
            "assetType": "USD",
            "quantity": "0"
        },
        "shortTerm": {
            "assetType": "USD",
            "quantity": "-87.133251361246620162189357418267650072"
        },
        "total": {
            "assetType": "USD",
            "quantity": "-87.133251361246620162189357418267650072"
        }
    }
}

This lists a subaccount's gains for a given period, broken down into short-term, long-term, and the total.

curl --request GET \
     --url 'https://api.anchorage.com/v2/tax/gains/costbasis/32ee4b77-7f2a-4486-86f8-01c6bc8e4fda?startDateTime=2023-01-01T00:00:00Z&endDateTime=2025-03-01T23:59:59Z' \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": [
        {
            "acquisitionTxId": "995024a3-bcc1-5430-a2fd-7fc448cd2dd1",
            "cost": {
                "assetType": "USD",
                "quantity": "40.012"
            },
            "costBasisDate": "2024-12-04T20:25:59.509Z",
            "dispositionTxId": "61ab9b9f-f2e3-5342-aa8f-1d56386379d6",
            "externalAcquisitionTxId": "8db3d7fe-7094-41ba-bc0e-e188868330bd",
            "externalDispositionTxId": "8847a503-f2e1-45d4-8c20-18db2f4f6dd8",
            "gain": {
                "assetType": "USD",
                "quantity": "-0.0419952"
            },
            "gainType": "short-term",
            "proceeds": {
                "assetType": "USD",
                "quantity": "39.9700048"
            },
            "saleDate": "2024-12-04T20:38:37.544Z",
            "sold": {
                "assetType": "USDC",
                "quantity": "40"
            },
            "taxYear": "2024"
        },
        {
            "acquisitionTxId": "9f37f389-805b-588a-8a53-1b1c2ab7e88a",
            "cost": {
                "assetType": "USD",
                "quantity": "29.857243243243243275"
            },
            "costBasisDate": "2024-12-10T21:35:14.770Z",
            "dispositionTxId": "fbc82c96-db85-58d9-b1e6-2bb464331a47",
            "externalAcquisitionTxId": "2c1aecbb-f2da-41c4-ac17-31d9c3b7777c",
            "externalDispositionTxId": "071994b2-eeaa-44ff-bdb6-60b7b7bb565f",
            "gain": {
                "assetType": "USD",
                "quantity": "-6.138086143243243275"
            },
            "gainType": "short-term",
            "proceeds": {
                "assetType": "USD",
                "quantity": "23.7191571"
            },
            "saleDate": "2024-12-19T21:09:15.831Z",
            "sold": {
                "assetType": "DOGE",
                "quantity": "75"
            },
            "taxYear": "2024"
        },
        {
            "acquisitionTxId": "14cd2f44-08df-5fdb-ae92-db6c6a936d02",
            "cost": {
                "assetType": "USD",
                "quantity": "9.999999999999999999998687270531437065"
            },
            "costBasisDate": "2025-01-16T20:16:13.631Z",
            "dispositionTxId": "597faa5d-2dd1-5aab-8d9e-b63a4c149863",
            "externalAcquisitionTxId": "214742bd-c471-4cc7-81b6-8459c3559c8a",
            "externalDispositionTxId": "e04efda7-174f-43cb-8d00-618c4a9fceb4",
            "gain": {
                "assetType": "USD",
                "quantity": "-0.006594503866628156998687270531437065"
            },
            "gainType": "short-term",
            "proceeds": {
                "assetType": "USD",
                "quantity": "9.993405496133371843"
            },
            "saleDate": "2025-01-20T14:22:46.091Z",
            "sold": {
                "assetType": "ETH",
                "quantity": "0.002988123420803661"
            },
            "taxYear": "2025"
        },
      
    ]
}

Step 5: Get tax reports

This enables you to fetch a specific subaccount's tax forms for download.

curl --request GET \
     --url https://api.anchorage-staging.com/v2/tax/subaccounts/subaccountId/forms \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": [
        {
            "forms": [
                {
                    "downloadLink": "https://m1-prod-useast1-documents-v2.s3.us-east-1.amazonaws.com/df54226c-3c4a-4819-8c84-3544294fb5a2/f00b6f3d-bde0-4b43-814b-4e52e299d2d1/US/IRS_1099_B/2024/document.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=ASIATTOKKA36SIZAFU7L%2F20250303%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20250303T162946Z&X-Amz-Expires=3600&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEKD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJHMEUCIQCx3craRGcOgHGUjqOBFE77nfWZyPJWMZxPo4JFXYQsPAIgLR6fPolcAlD4I%2Fv6FKwnnhMzQ%2Fos%2BKmzN%2Bslh%2FNv9tsqyAMI2P%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FARABGgwyNDc5MjE3NzIyODUiDF08I4JNkMPQn5rTgiqcA4aCMRSy%2F%2FzgRy3S3kNpZkpEYkICBNY9dK3OA1gAiddrVm5H3Hrk5e2y1dgdl%2B9TDBhDmT8pXpPz9tmlO40f6Az1LUFv4O3X1nNlEZxQ3gknmcwlm9g8QwMMLcl2xLq3NzMMEf2%2Fa5Fym%2BGdxao2AT2cOQLJGMQJAac3P1C0m3us%2BDu8gyvUDnlTn0pWqfG0gFYjwi5tJ18jX3y3kwbdkqRXBTPvd%2BS3vA%2FTUcRnXv%2FHEO7Bbm82gCttP53N5Rs8io8RINGSvrUkRIXqzWPKeu90LXAZb5OGd0Rd55hyHKnp3cgtqF%2BKsTZe2AHTnZ4Y5jmJ44v2LIlvYRFpsueros9lO6gHGWsGUOGQ3y%2F3YNaiqNgoDWw4n3EdXSJ84I81vPYtP0jSaGGHhOUIIbwc3gjS0r0rPZKTWbBaDzwxvUJlIkXHcAxs4YDVX8EiRbpus%2FDc02uV6FH8iG89aI1PznG3WFDWOcPY8ySpRD5CgBJZFlzr4onx6eDSzQIGlBiln%2BCFz91yCAcquCCN%2FTcL0fIe%2F0sKEYGxAzBWLVUwqIyXvgY6ngFLRQgdEkIWVJDoY3ZdMAkVXw9t9zrIW4dH97%2BP9%2BDT9VxrpPV3qOFAXWRtSoKe1DTJvttyJNX26BxZ9vpjMHv3puH4%2F6OlspJjKZAKx1ZC%2FgWhROv7Esz1oENDYDsq6RHoOqTkxvd%2F8paQj2yij6D56WjEWyriJ6bHh2m%2FIGo6lIDNXTkdnfgBVl2c54kQDmTE3m%2FXtmPwVlSn39Bpsw%3D%3D&X-Amz-Signature=0d98fc809b01cc79000761f56b2c49ed2faa945f9a05602cf7e2a74cf1633ffa&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3B%20filename%20%3D%2232ee4b77-7f2a-4486-86f8-01c6bc8e4fda_2024_1099B_0.pdf%22&versionId=oWG4IvC6K9czomKVCirc3a.ocWDWjsy2&x-id=GetObject",
                    "formType": "1099_B"
                }
            ],
            "subaccountId": "32ee4b77-7f2a-4486-86f8-01c6bc8e4fda"
        }
    ]
}

Example Link Here: Form Download Example

This enables you to fetch tax forms for a specific customerId (end client) for download.

  • affilateId = customerId
curl --request GET \
     --url https://api.anchorage-staging.com/v2/tax/clients/df9ed63dd86dacc3e5b0f8a963818c2c3de433a87f60fd5ec6382375d993b8a8/forms \
     --header 'Api-Access-Key: {Insert API Key}' \
     --header 'accept: application/json'
{
    "data": [
        {
            "forms": [],
            "subaccountId": "bb41b0c4-b3d7-4132-94d0-9ae2293bca5e"
        },
        {
            "forms": [
                {
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                    "formType": "1099_B"
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            "subaccountId": "32ee4b77-7f2a-4486-86f8-01c6bc8e4fda"
        }
    ]
}

Example link here: Form download example

Note: Anchorage Digital does not provide financial, tax, or legal advice


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