Abstract: An implementation of the present application provides a computer—implemented method to increase the security of a blockchain—implemented transaction, the transaction including participation from a plurality of participating nodes, each participating node participating as a message originator, selector, and propagator. The method, implemented at a participating node, includes: receiving ciphertext from a prior node and determining whether the participating node is a selector node for said ciphertext received from the prior node. When the participating node is the selector node for said ciphertext, the method includes selecting a subset of said ciphertext, decrypting the selected subset of said ciphertext to provide opted ciphertext and transmitting said opted ciphertext to the next node. When the participating node is other than the selector node for said ciphertext, the method includes decrypting said ciphertext received from the prior node and transmitting the decrypted ciphertext to the next node.

Abstract: A computer-implemented method for transmitting and/or submitting digital content such as feedback for an entity to a blockchain is disclosed. This may be, for example, the Bitcoin blockchain. The method, which is implemented at a first node, includes: submitting, to the blockchain, a first transaction (Tc) for committing a first quantity (x) of tokens to transfer to a second node associated with the entity, the first transaction (Tc) having a first output; generating a first content for submission to the blockchain; and submitting, to the blockchain, a second transaction (Tf1) that returns a second quantity (d) of the committed first quantity (x) of tokens to an address associated with the first node, the second transaction (Tf1) having the first output of the first transaction (Tc) as an input, wherein the first content is used to unlock the first output of the first transaction (Tc).