hello sir. I use the
https://testnet.tonviewer.com/transaction/77fb3cc4ad47a5d9dcd178f91d5454eee42e14c267056375975f227e6df78d92
or the
https://testnet.tonviewer.com/transaction/4c53b8e11851672876e354f537d4ae9d16cf3f9e9f7c3bd47ca2b1fbc8fba0db
can get almost same result.

what is the logic of this page?

if I only have 77fb3cc4ad47a5d9dcd178f91d5454eee42e14c267056375975f227e6df78d92 how can I get the 4c53b8e11851672876e354f537d4ae9d16cf3f9e9f7c3bd47ca2b1fbc8fba0db

or If I only have 4c53b8e11851672876e354f537d4ae9d16cf3f9e9f7c3bd47ca2b1fbc8fba0db how can I get 77fb3cc4ad47a5d9dcd178f91d5454eee42e14c267056375975f227e6df78d92

the tonviewer is the tonviewer.

but I want to use the api to get the result. not see by eyes.

which api can I use?