You'll treat this as a sale of your 0.138887 BTC on March 18th,2024. You'll enter the sale price as the value of the BTC and ETH that you received on that date. You'll enter the basis as what you paid for the original BTC before you deposited it with Celsius. This works out to a loss for you (in theory) for this year.
Then the basis of the BTC and ETH that you received carries on as their value on March 18, 2024 as though that is what you paid for them in cash. It will be their basis when you sell them.
@Tom201
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