Integration of blockchain-enabled readers with blockchain network using machine-to-machine communication protocol

A system comprising:

• a blockchain ledger system in a blockchain network;
• and
• a subscriber node that is a participating node in the blockchain network, wherein the subscriber node comprises a processor and a non-transitory storage medium storing instructions executable on the processor to:
• receive, at the subscriber node, event data published by a publisher node, the event data communicated to the publisher node by a blockchain-enabled reader using a machine-to-machine communication protocol, wherein the event data is signed by the blockchain-enabled reader using a private key and location information regarding a location of the blockchain-enabled reader so that a signature based on the private key and the location information is included in the event data, the private key and the location information included in a decentralized identity provisioned to the blockchain-enabled reader from the blockchain network;
• verify the decentralized identity of the blockchain-enabled reader using a public key, wherein the verifying comprises extracting, from the event data, the signature based on the private key and the location information included in the decentralized identity, and validating the signature using the public key;
• submit, from the subscriber node to the blockchain ledger system, the event data for storing in a distributed ledger in response to successful verification of the decentralized identity of the blockchain-enabled reader,
• wherein the blockchain ledger system is to:
• select a smart contract function for a given context based on parameters in the event data, wherein the selected smart contract function is selected, based on a value of a parameter of the parameters relative to a threshold, from a plurality of smart contract functions for respective contexts;
• and
• verify the event data using the selected smart contract function.

A non-transitory machine readable medium storing instructions executable by a processing resource to:

• receive, at subscriber node in a blockchain network, event data published by a publisher node, wherein the event data is communicated to the publisher node by a blockchain-enabled reader using a machine-to-machine communication protocol, and wherein the event data is signed by the blockchain-enabled reader using a private key and location information regarding a location of the blockchain-enabled reader so that a signature is included in the event data, the private key and the location information included in a decentralized identity provisioned to the blockchain-enabled reader from the blockchain network;
• verify, at the subscriber node in the blockchain network, the decentralized identity of the blockchain-enabled reader using a public key, wherein the verifying comprises extracting, from the event data, the signature based on the private key and the location information included in the decentralized identity, and validating the signature using the public key;
• in response to successful verification of the decentralized identity of the blockchain-enabled reader, submit, from the subscriber node to a blockchain ledger system, the event data for storing in a distributed ledger;
• select, at the blockchain ledger system, a smart contract function for a given context based on parameters in the event data, wherein the selected smart contract function is selected, based on a value of a parameter of the parameters relative to a threshold, from a plurality of smart contract functions for respective contexts;
• and
• verify the event data using the selected smart contract function.