2

I am attempting to note.preimage the following call data hash:

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When I then visit the preimage section of Polkadot.JS I notice the following error:

Unable to decode preimage bytes into a valid Call

The preimage hash is available on Polkadot currently with preimage hash:

0xdd1ccce594d19c2a17f5810f1df4c2f6217a74b59fd67e58e438bdc1acce64fb

Regards, Will

2

1 Answer 1

0

There must be something wrong with how you encoded the call. This is double encoded.

What tipped me off is that it still decodes in PJs when the first three bytes are removed; so just starting with 0x1a04c….
Now the first three bytes 0xb57904 are the compact SCALE encoding of an u32 of value 7,789. This is exactly the length of your preimage minus three.

The correct preimage should therefore be:

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For testing this in advance: you can use chopsticks and then use the local injected ALICE account to note the preimage and double check:
npx @acala-network/chopsticks@latest -c polkadot.

1
  • 1
    This worked, thanks! I take your point about testing on chopsticks, this costed me quite a few DOT testing various iterations. Commented Jul 13, 2023 at 17:33

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