Original Paper: Homomorphic Payment Addresses and the Pay-to-Contract Protocol

Pay-to-Contract transaction with signaling output tx.

Client

• get merchant's pubkey and order-format(JSON format)
• build transaction for buying order and send bitcoin
• upload json to IPFS

Server

• watch blockchain to search signaling tx.
• get IPFS location from signal
• lookup order contract from ipfs

development tips

• use insight api on regtest mode: https://www.oodlestechnologies.com/blogs/Create-Bitcoin-Explorer-Using-Bitcoind-And-Bitcore-Insight
• btcregtestinsight: https://github.com/starcharles/btcregtest-insight

TODO

• make as a library
• publish as npm package
• option to use blockCypher API/ bitcore light client
• remove OP_RETURN with IPFS tag