Is there an existing issue for this?

• I have searched the existing issues

Current behaviour

Unable to load UTXO snapshot, assumeutxo block hash in snapshot metadata not recognized (00000000000000000000d4041fe771edd9dcb945bb85dfa739af1d2724a464e8) (code -32603)

Expected behaviour

expect txoutset to load properly

after researching issues, can't tell if this is new or has been recently fixed, so reporting as new

Steps to reproduce

on 64 bit ubuntu bionic bitcoin-qt v26.0 dumptxoutset /path/to/txoutsetsave

transfer file to 32 bit focal bitcoin-qt v26.0, then: loadtxoutset /path to/txoutsetsave

Relevant log output

n/a

How did you obtain Bitcoin Core

Compiled from source

What version of Bitcoin Core are you using?

v26.0 64bit compiled on target host, 32 cross compiled on ubuntu 20.04, details below

Operating system and version

see below

Machine specifications

Sending end, v26.0 64 bit Linux mn128 4.15.0-142-generic #146-Ubuntu SMP Tue Apr 13 01:11:19 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux Description: Ubuntu 18.04.4 LTS Release: 18.04 Codename: bionic

gcc (Ubuntu 9.4.0-1ubuntu1~18.04) 9.4.0 g++ (Ubuntu 9.4.0-1ubuntu1~18.04) 9.4.0

dumptxoutset /root/txoutset { "coins_written": 160267297, "base_hash": "00000000000000000000d4041fe771edd9dcb945bb85dfa739af1d2724a464e8", "base_height": 827848, "path": "/root/txoutset", "txoutset_hash": "45e02b1822285f0d1643d9e94492eb0fb7f0db74fc62f39ddc7345b28b98bb92", "nchaintx": 958978137 }

receiving end, 14:29:45

Linux bitcoinKB 5.4.81-pup32 #1 SMP Fri Dec 4 10:09:29 GMT 2020 i686 i686 i686 GNU/Linux (focal32 20.12)

bitcoin built 5.4.0-126-generic #142-Ubuntu SMP Fri Aug 26 12:12:57 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux Description: Ubuntu 20.04.5 LTS Release: 20.04 Codename: focal

gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0 g++ (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0

loadtxoutset /mnt/sda2/txoutset

14:29:46

Unable to load UTXO snapshot, assumeutxo block hash in snapshot metadata not recognized (00000000000000000000d4041fe771edd9dcb945bb85dfa739af1d2724a464e8) (code -32603)

Loaded utxo sets need to match hardcoded utxo set and block hashes. These are currently not set for mainnet and so loadtxoutset is not expected to work on mainnet.

The release notes indicate this is a new feature, it does not mention that it is not expected to work. Looks like a nice feature. You should clarify the release notes PLEASE.

bitcoin/doc/release-notes

/release-notes-26.0.md New RPCs

loadtxoutset has been added, which allows loading a UTXO snapshot of the format generated by dumptxoutset. Once this snapshot is loaded, its contents will be deserialized into a second chainstate data structure, which is then used to sync to the network's tip.

Meanwhile, the original chainstate will complete the initial block download process in the background, eventually validating up to the block that the snapshot is based upon.

The result is a usable bitcoind instance that is current with the network tip in a matter of minutes rather than hours. UTXO snapshot are typically obtained via third-party sources (HTTP, torrent, etc.) which is reasonable since their contents are always checked by hash.