command `blocks` fails

I meet an error I don't understand. On the 30/09/2021 on branch dev at commit 60eb5d. On Linux Mint 20.1 Ulyssa

I can reach nodes. silkaj info works.

However, silkaj blocks does not :

$ silkaj blocks
Traceback (most recent call last):
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/bin/silkaj", line 5, in <module>
    cli()
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/click/core.py", line 1134, in __call__
    return self.main(*args, **kwargs)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/click/core.py", line 1059, in main
    rv = self.invoke(ctx)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/click/core.py", line 1665, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/click/core.py", line 1401, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/click/core.py", line 767, in invoke
    return __callback(*args, **kwargs)
  File "/home/thomas/Documents/Duniter/silkaj/silkaj/commands.py", line 159, in list_blocks
    idty = identity_of(issuer["pubkey"])
  File "/home/thomas/Documents/Duniter/silkaj/silkaj/wot_tools.py", line 33, in identity_of
    return client(wot.identity_of, pubkey_uid)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/duniterpy/api/client.py", line 455, in __call__
    return _function(self, *args, **kwargs)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/duniterpy/api/bma/wot.py", line 350, in identity_of
    return client.get(MODULE + "/identity-of/%s" % search, schema=IDENTITY_OF_SCHEMA)
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/duniterpy/api/client.py", line 372, in get
    return client.request_url(
  File "/home/thomas/.cache/pypoetry/virtualenvs/silkaj-hneDEFxq-py3.8/lib/python3.8/site-packages/duniterpy/api/client.py", line 260, in request_url
    with request.urlopen(
  File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.8/urllib/request.py", line 640, in http_response
    response = self.parent.error(
  File "/usr/lib/python3.8/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 503: Service Unavailable