Currently, to prove to someone that you send him/her Monero, one can use this service checktx. However, this has some limitations:
- it uses JavaScript,
- it is not available as hidden services,
- it is dependant on a third party service, i.e., http://moneroblocks.info, which is closed sourced.
In this example, these limitations are addressed by development of an Onion Monero Prover. The prover is
- fully open sourced,
- does not depend on any third party services,
- it does not require JavaScript, and
- is available as a hidden service
https://github.com/moneroexamples/onion-monero-blockchain-explorer
Thus, the prover as a standalone service wont be maintained anymore.