To ensure that repositories can't be manipulated a commit id can be tracked on faircoin blockchain and allows it to compare the commits in the repository with the commits on blockchain.
Every repository gets a public faircoin address. Every developer gets a faircoin address.
When a developer has done changes he/she gets the commit id ( hexadecimal number ). This hex number will converted to decimal and results in a small faircoin amount where all 8 decimals can be used. When he/she has sent this amount to the faircoin address of the repository then the id is stored within the blockchain timestamp.
By usage of a modified block explorer that can show hex instead decimals the list of commit ids can be checked.