See it working
Everything on this page is a real record on the practice ledger, made the same way a real one is. Nothing here is a screenshot. Open any of them and check for yourself.
Two people, one record, neither able to change their half later
A letting agent recorded the state of a kitchen at move-in and handed the record to the tenant. The agent wrote what was already damaged. The tenant looked, added what they found, photographed it, and accepted. Both sides are on the certificate, and the handover itself is on the ledger.
Look at the chain of custody near the bottom: who held it, when, and what each of them said at the moment it changed hands.
Try it yourself, right now
No account, nothing to install. Type anything and it goes on the practice ledger in about a second, exactly as a real record would.
A parcel that changed hands twice
A chain of custody grows a step every time something moves. This microscope went from the supplier to a courier to a laboratory, and each leg has the condition noted and photographed by both the person handing it over and the person receiving it.
Supplier packed it and noted the seals were intact. The courier checked those seals on collection. The lab unpacked it the next morning, confirmed no crush damage, and powered it on.
If it had arrived broken, the certificate already says who had it last and what they said about it at the time. Nobody has to be believed.
Agreements between people
Two names on one document
One party records the agreement and asks the other to put their name to it. The other checks the exact file before signing, and adds their own words. Neither person owns a cryptographic key.
Three parties on one minute
A shared equipment purchase, signed by all three organisations paying for it. Each signature is its own line on the ledger, and each person's own words are kept as theirs rather than merged.
Things that change over time
A document on its third version
Each revision points at the one it replaced, so the certificate carries the whole history. Useful when the argument is about which version somebody actually agreed to.
A sealed bid, opening later
The record is public now, so the time cannot be argued with, but the contents stay shut until a date the author picked. Right now you can see that it exists and when it opens, and nothing else. Predictions, bids, "I said so first".
Volume, and things that are not files
Eight things, one line on the ledger
A whole set of check-in photos folded into a single entry for the cost of one. Each still checks on its own, and the proof does not depend on trusting this page. Up to five hundred at a time.
A copy anyone can download and check
A calibration certificate kept alongside its record. Download it and your own machine can confirm it is byte for byte the file that was recorded, not a later edit.
What a web page served, on a given day
Give PollyPay an address and it fetches what is there, fingerprints it and keeps a copy. For terms that quietly change, or a price that was advertised.
Say something publicly, with your name on it
A claim about a website, an address or a product, with an account behind it and a time nobody can move. Useful for "this is the only address we take payment at".
And the other side of it
Check something without an account
Drop a file and your own browser works out its fingerprint and asks whether it is on the record. The file never leaves your device. This is what the other side of a dispute does, and it takes seconds.
A public page of everything on the record
An account can show its records, statements and posts as one dated timeline at a name it picks, with an RSS feed for anyone who wants to follow it.
What this costs
Twenty records an hour cost nothing. Past that a penny each. A hundred megabytes of kept copies are free with every account, and more is a pound a month for ten gigabytes. The network fee itself is a fraction of a penny, and PollyPay pays it so nobody has to hold a wallet.
The examples above are on the practice ledger, which is a real public ledger used for testing. Real records are made the same way and go on the main one.