How has no one been able to point out the OP's error here? @OP When you say "immutable," you mean that it cannot be changed or tempered with; do you mean to say "nonimmutable or mutable?"
Even now in my country, the documents from property (assets) are still kept in ledgers, and there are duplicate copies of agreements made before some witnesses, where the real owner is being given the original document of ownership. The owner of those assets is entitled to the security of his or her documents, which can be swapped (stolen) if they are mishandled. The same goes for the crypto asset. A transaction on the blockchain may be immutable because it was shared with different people on the network, but should I remind you that your name is not also written on the blockchain when you sign a transaction? Another person can steal your crypto assets if you mishandle your private key (wallet phrase).