15

If I am not a miner and would like to put arbitrary data in the block chain, is there currently any method or protocol to get a miner to add it for me?

8

There is a service named btcmsg which allows you to do this. Here is the announcement in bitcointalk. The website is at btcmsg.staticloud.com.

They use a simple protocol to write and read the messages in the blockchain:

BTCmsg Protocol v1 (2011-09-18)

Each message is represented by multiple payment which is calculated by the following algorithm:

  1. Two first chars for message type ('01' for md5, '02' for ascii).
  2. Then the message in hex (python binascii.hexlify).
  3. Split the long string to groups of 4 hex digits.
  4. Each group of 4 hex (e.g. 2 ascii letters from the message) is represented by a payment in satoshi (maximum 0xffff=65535).
  5. The service fee (composed of a fixed part and a variable part times the amount of small payments required, minus the transaction fee) can be seen within the first transaction.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.