CryptoCoinWatch: Datafeed to watch the amount received on any cryptocurrency address

mids106

CryptoCoinWatch is an open source Ethereum datafeed to watch the amount received on any cryptocurrency address. This data can be subsequently used by any other smart contract on the Ethereum blockchain: CFDs, escrows, betting contracts, etc. While using a single datafeed would be a single point of failure, contracts could (should) select multiple independent datafeeds (with different sources) to compensate.

Basically this contract will offer a proxy for getrecievedbyaddress, i.e https://blockchain.info/q/getreceivedbyaddress/36PrZ1KHYMpqSyAQXSG8VwbUiq2EogxLo2

Contract source code, documentation and test code is available on https://github.com/EtherCasts/cryptocoinwatch

I am currently working on the datafeed watchdog process and creating a small DApp UI.

StephanTual

Very cool @mids106‌ !

mids106

Now with watchdog process and DApp web interface!
https://i.imgur.com/s3FnhWv.png

mids106

I have created an example ETH/BTC trade contract that shows how such a datafeed can be used:

# ETH/BTC escrowed trade contract using CryptoCoinWatch datafeed
#
# buyer - person buying the BTC, selling ETH
# seller - person selling the BTC, buying ETH
# datafeed - address of cryptocoinwatch datafeed contract
#
# protocol:
# 1) buyer initialized trade contract
# buyer => "new", seller, datafeed, btc_address, btc_amount, expiry
# contract escrows eth_amount (callvalue)
# contract requests datafeed to watch btc_address
# 2) seller sends btc to btc_address
# 3) watchdog will notice total bitcoins received and updates value
# 4) buyer/seller triggers contract to finish
# buyer/seller => "finish"
# after expiry; sends escrowed ETH back to buyer
# contract checks with datafeed:
# - amount received, send escrowed ETH to seller
# - amount not received; nothing happens

https://github.com/EtherCasts/cryptocoinwatch/blob/master/contracts/example_btc_trade.se

vaX

ϟvv☰☰☥