At first I thought my computer had become infected with malware, so I performed a full system scan and found nothing.
I then went to a different computer that I thought would be clean so that I could download a bootable virus removal tool. I noticed this other computer also was also detecting bitcoin scripts. Along with other computers on my network.
I then noticed that only HTTP websites were causing these scripts to be detected.
I thought it then must be a device on the network preforming a HTTP header injection attack on my router. I began turning off every device I own until I was only left with my router and a laptop that had been off for months. The issue still persisted.
Thinking the routers might be infected, I unplugged them and connected my laptop directly to my ISP modem. Same thing occurs. Bitcoin scripts detected when visiting HTTP sites.
I tried connecting my laptop to a different ISP (by tethering my Verizon phone) and no scripts were detected.
Since I'm fairly certain this laptop isn't infected, that leaves me to believe my ISP's equipment has been compromised.
Is there anything else I can try test? Is there an easy way to prove to my ISP that they are responsible for fixing the issue?