ipfs-reversed-table

import ipfsapi
import json

ipfs = ipfsapi.connect()
# JSON:
# { "data" : "something...", "previousBlock" : "ipfs hash to previous block"}
# genesisHash is "Qm00000000000000000000000000000000000000000000"
# when previousBlock == genesisHash then we reached the first block

genesisHash = "Qm00000000000000000000000000000000000000000000"
previousHash = "0"
hash = "QmXtdjRXaXQaWmzbDNJmLNURLCGSVMnPcPdXoDKzbqSnBb"

ipfs.cat(hash)

while previousHash != genesisHash:
  obj = json.loads(ipfs.cat(hash))
  previousHash = hash = obj['previousBlock']
  print(obj)