Is it possible to anonymously programmatically verify that a transaction has reached n number of validations without running a full node? If so, what is the best means to do this?
Basically I want it to build a payment system where after the transfer is initially detected, the customer sees a message thanking them and telling them that their purchase will be processed within 24 hrs and that they'll receive an email once confirmation is complete. Then throughout the day maybe run a cron job that checks that each transaction reaches the desired number of validations and if so divide the money between two wallets and mark the product to be sent. I also don't want it to be with a service like Coinbase or Bitpay where they have control of your coins.
So far I've been experimenting with Blocktrail and mycelium gear. Both have some elements I like but still not everything that I need. With mycelium you can set the number of verifications but for instance if I want to set it for 6 verifications the customer would have to sit there possibly an hour before they see the next screen. Blocktrail allows me to query that a transaction is validated but it only has the ability to check that 1 validation was completed as far as I can tell. Can anyone suggest an API or widget that can accomplish these things? Preferably PHP or if not JQuery.
Blockchain.info has a simple Query API for querying how much bitcoin an address has received. You can add a confirmations=n parameter that will only include bitcoin that has been confirmed 'n' times. It returns a simple value in satoshis.
For example to check how much bitcoin was received with at least 2 confirmations at a specific address you could have your code query the API like this:
https://blockchain.info/q/getreceivedbyaddress/1PFtyX9nQvjP8U2N3iUk2oNorzPfpjX9sK?confirmations=2