blockcypher.make_tx_signatures() method Error

[b0r1ngx]

This is main reference, i try to use simple_send()

i try to navigate at callbacks, and see that it always error on this place, because method ecdsa_raw_verify(), always get tuple type (None, Int, Int), and we get in v None always, and then compare it between 27 and 34

on 529 code line, we always get error

[b0r1ngx]

@matthieu
@quentinlesceller
@acityinohi

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