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xrpl-hooks-ide/xrpl-hooks-docs/md/hooks-transaction-hash-buf-len.md

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# hooks-transaction-hash-buf-len
Function [otxn_id](https://xrpl-hooks.readme.io/v2.0/reference/otxn_id) has fixed-size canonical hash output.
This check warns about too-small size of its output buffer (if it's specified by a constant - variable parameter is ignored).