@Rohit Kumar Firtsly, Apologies for the delay response!
Welcome to Microsoft Q&A Forum! Thank you for posting your query here!
1. Is it possible to purchase "Blob Storage Digests Backed by Confidential Ledger" through the CSP model? Please check with CSP provider they can provide more detailed information on this issue.
2. Can I create an Access Control List (ACL) in any available region from Singapore via the CSP model? : Yes, as long as services are globally available and not restricted by any compliance policies specific to the CSP subscription.
If the issue is still not rectified, for more specialized assistance, I would recommened to please contact Billing and Subscription team would be the best to provide more insight and guidance on this scenario: https://azure.microsoft.com/en-us/support/options/ it's free, and it's the best choice for you.
Additional information:
Azure confidential ledger : https://learn.microsoft.com/en-us/azure/confidential-ledger/
Integrity protect your Azure blob storage data with Azure confidential ledger
Create a Managed Application to Store Blob Digests
Please let us know if you have any further queries. I’m happy to assist you further.
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.