ipdb/ipdb-tx-spec

The IPDB Transactions Spec became the BigchainDB Transactions Specs. See below.

The IPDB Transactions Spec became the BigchainDB Transactions Specs. See:

1. BigchainDB Transactions Spec v1 (used by BigchainDB 1.3.0 and lower)
2. BigchainDB Transactions Spec v2 (used by BigchainDB 2.0+)