[Feature Request] - Implement Fast Sync (UTXO Set snapshot)

[ffrediani]

Can Fast Sync be implemented on Umbrel Bitcoin in order to accelerate initial blockchain synchronization and allow users to start using some applications that are fine to use a in this way or when using a pruned node ?

How can UTXO Set snapshot can be implemented or at least be optional on Umbrel Bitcoin web interface to allow the user to choose it specifically in such cases ?

Reference: https://docs.btcpayserver.org/Docker/fastsync/

[fjahr]

I would recommend to implement support for AssumeUTXO instead, which will be available for mainnet use starting with Bitcoin Core v28 which should be available some time in October: bitcoin/bitcoin#29891 I expect that BTCPayServer replaces Fast Sync with AssumeUTXO at some point in the future too.

[yshwanth]

https://blog.lopp.net/bitcoin-node-sync-with-utxo-snapshots/

[fjahr]

https://blog.lopp.net/bitcoin-node-sync-with-utxo-snapshots/ How do we do this in Umbrel for fast sync and is there any guide ?

Why do you want to use fast sync and not assumeutxo? There is up-to-date documentation on assumeutxo: https://github.com/bitcoin/bitcoin/blob/master/doc/assumeutxo.md and the next bitcoin core release (v29) will allow a mainnet snapshot for 880,000: bitcoin/bitcoin#31969

[ffrediani]

That sounds a quiet interesting thing to have on Umbrel UX certainly.

https://blog.lopp.net/bitcoin-node-sync-with-utxo-snapshots/ How do we do this in Umbrel for fast sync and is there any guide ?

[yshwanth]

There is up-to-date documentation on assumeutxo: https://github.com/bitcoin/bitcoin/blob/master/doc/assumeutxo.md and the next bitcoin core release (v29) will allow a mainnet snapshot for 880,000: bitcoin/bitcoin#31969

Steps

• Download the utxo .dat file magnet using qBittorrent
• Copy from utxo880k.dat file in Downloads, paste inside bitcoin data folder
• Go to terminal inside bitcoin docker, execute those commands
• Check troubleshoot for logs and successful chaintip
• Check Bitcoin app to sync from 880000 onwards...!