Here’s the link to the IRS about this safe harbor garbage
https://www.irs.gov/pub/irs-drop/rp-24-28.pdf
Here are the forms, there two but I think you only need to use one. Please read before using them
https://cryptotaxgirl.com/wp-content/uploads/2024/12/Digital-Asset-Allocation-Plan_CryptoTaxGirl.pdf
Here is the link to opentimestamps

eForm

OpenTimestamps: a timestamping proof standard
OpenTimestamps aims to be a standard format for blockchain timestamping.