Bitcoin blockchain’s reputation as a network that mainly supports digital gold may be changing as efforts gain traction to add new features via a software upgrade to its code.The front-runner in the upgrade debate is a program called OP_CAT — a small software tweak that would add about 10 lines to the code that enables linking of two elements together, so-called concatenation. If adopted it would open the door to a host of enhancements for Bitcoin users from better coin custody to decentralized-...