# Signing and Verifying Arbitrary Data

**URL:** <https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440>\
**Category:** FCL\
**Created:** [October 5, 2021, 8:02am UTC](https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440 "2021-10-05T08:02:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PhamTinh](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/phamtinh/32/573_2.png) [@PhamTinh](https://forum.flow.com/u/PhamTinh)\
**Post date:** [October 5, 2021, 8:02am UTC](https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440/1 "2021-10-05T08:02:29Z")

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I tired authentication user by blockto.  
i have done the signing successfully but on the verify step serve seems the problem as far as i see is cros `https://testnet-faucet.onflow.org/fund-account/flow.access.AccessAPI/GetAccountAtLatestBlock`  
Can anyone help me to solve this problem?

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<div class="post-metadata">

**Author:** ![flowjosh](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/flowjosh/32/362_2.png) [@flowjosh](https://forum.flow.com/u/flowjosh)\
**Post date:** [October 12, 2021, 7:56pm UTC](https://forum.flow.com/t/signing-and-verifying-arbitrary-data/2440/2 "2021-10-12T19:56:12Z")

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Can you share more about what you are doing and what the error is?