[Bug] TAO raw-extrinsic parser reads sender bytes off by one, producing a wrong SS58 address

[carlos4s]

Where

allways/chain_providers/subtensor.py:79-87 - SubtensorProvider.parse_raw_extrinsic

What's wrong

The signed-extrinsic body layout is:

byte 0      : version byte (top bit = signed)
byte 1      : MultiAddress variant (0x00 = Id)
bytes 2..34 : 32-byte AccountId
…

But the parser reads:

# Sender AccountId is at bytes 1..33
sender_bytes = body[1:33]
sender = ss58_encode(sender_bytes, ss58_format=42)

So it includes the variant byte at the start and drops the last byte of the real AccountId. The resulting SS58 string is well-formed but wrong.

The destination decoder right below (line 109-112) already does this correctly: it checks after_call[0] == 0x00 (the variant) and then takes after_call[1:33] (the AccountId).

Impact

This path is the fallback used when normal block decoding fails (pruned blocks, etc.). When it fires, verify_transaction(..., expected_sender=…) compares the real sender against this off-by-one parse and rejects a legitimate TAO transfer. Validator confirms then fall through as unverified.

Repro

Build a signed extrinsic body whose true sender is 5C4iA2und8WV6mbvTBYupm2eZwtxk3wCYUM2SFHXSyQuapGp, feed it to parse_raw_extrinsic, and observe a different SS58 string come back.