Media channel monitoring to prove content presentation

1. A method for providing a blockchain-based proof of presentation of content on a media channel based on a blockchain, the method comprising:

generating, upon receiving a request to generate, at least first, second, and third parameters,

wherein the first and second parameters are input parameters and the third parameter is calculated as an output parameter of a one-way cryptographic function;

generating a first type of block by incorporating the first and third parameters into the first type of block;

validating the blockchain by determining that all hashes included in the first type of block of the blockchain are consistent;

validating the first type of block by determining that there is no previous first type of block with a same value of a third parameter in the blockchain;

appending the first type of block to the blockchain when both the first type of block and the blockchain are declared valid;

receiving the content;

embedding the second parameter into the content that is to be made available on the media channel to produce tainted content; and

monitoring the media channel for the tainted content and extracting the second parameter from the received tainted content using a probe;

extracting the first and third parameters from the first type of block of the blockchain;

performing a test on a condition of the one-way cryptographic function using the first and third parameters extracted from the first type of block of the blockchain and the second parameter extracted from the tainted content; and

accessing the blockchain and test challenge blocks in the blockchain until the first and third parameters in a challenge block matches the extracted second parameter by meeting the condition of the test of the one-way cryptographic function.

2. The method of claim 1 , wherein the first and second parameters are generated as pseudo-random numbers.

3. The method of claim 1 , wherein embedding the second parameter comprises

embedding the second parameter into the content as metadata.

4. The method of claim 1 , wherein embedding the second parameter comprises

embedding the second parameter into the content by adding an imperceptible watermark whose payload is the second parameter.

5. The method of claim 1 , wherein the content is an advertisement.

6. The method of claim 1 , further comprising generating a second type of block, incorporating the first and second parameters into an information section of the second type of block, and appending the second type of block to the blockchain, when the test meets the condition of the one-way cryptographic function.