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Digital assets - Schedule of Movement in Digital Assets Holdings (Details) - Digital assets - Bitcoin
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
numberOfBitcoin
Dec. 31, 2025
USD ($)
numberOfBitcoin
Number of Bitcoin    
Balance at period start (in number of bitcoin) | numberOfBitcoin   0
Acquisition of digital assets (in number of bitcoin) | numberOfBitcoin   510.03
Revaluation adjustments (in number of bitcoin) | numberOfBitcoin   0
Balance at period end (in number of bitcoin) | numberOfBitcoin 510.03 510.03
Amount    
Balance at January 1 | $   $ 0
Acquisition of digital assets | $   54,354
Revaluation adjustments | $ $ (9,725) (9,725)
Balance at December 31 | $ $ 44,629 $ 44,629