- Records are immutable
- Records are ordered
- It must be possible to check
hash(Xi)for anyi hash(Xi)can be sent to anyone as a proofhash(Xi) == hash(X, hash(Xi-1))- You do not need X to perform the check
$ pip install hlog
# create a chain
c = Chain()
# send some messages
c.append(message="Alice gives 10.36 euros to Bob", amount=10.36, currency="EUR")
c.append(message="Bob gives 2 dollars to Alice", amount=2, currency="USD")
# you can loop through the chain records
used_currencies = set(r.fields["currency"] for r in c.records)
# call verify() to ensure records have not been modified
c.verify()c.verify(raise_on_error=True)Verify will raise a ModifiedRecordException. It has 3 interesting attributes:
index: the index in the chain where validation starts to failmessage: a user-friendly message to indicate the errorrecord: theRecordobject itself
c = Chain()
c.append(message="hello")
c.append(message="wonderful")
c.append(message="world")
rows = c.dump()rows is a tuple of bytes, each item being one record of the chain.
If you want to reconstruct your chain based on a file or database records, you can use Chain.from_dump()
c = Chain()
c.append(message="hello")
c.append(message="wonderful")
c.append(message="world")
d = c.dump()
c2 = Chain.from_dump(d)
c2.verify()
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