TL;DR: "I hereby waive any right to request any erasure" is obviously not valid and if #GDPR does indeed apply to e.g. git, which it probably does, we just can't use Merkle trees in the EU any more, if they contain any traces of PII.

Is my account code on bitcoin PII? If I posted it on my blog, I don't see why it wouldn't be.

Has someone ever posted their bitcoin account code on their blog? Heh.