'invalid miner address or signature' in logs

[cerblue]

I'm seeing a lot of invalid miner address or signature error messages in logs, along with verifying miner address: calling full node state miner info: RPC client error: sendRequest failed: http status 503 Service Unavailable unmarshaling response: invalid character '<' looking for beginning of value. My miner (f010088) was able to get some deals recently, so the error may be happening intermittently. I've tried re-initializing the bidbot repo (signing a new verification message), and changing Lotus API gateway URL in the bidbot config, but this error persists.

[jsign]

invalid character '<' looking for the beginning of the value

Yeah, that's a signal that the GLIF API might have gone down temporarily.
I wouldn't worry much about it since that might happen once in a while (or longer if GLIF is having some particular longer downtime).