Event
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V.1.4.3
V.1.4.3
  • nChain Event User Guide
  • πŸ“”Overview
    • Introduction
    • Configuration Symbols
    • Features and Benefits
    • Core Concepts
    • Encoded and Unencoded ‑ Records
  • πŸ€”Using nChain Event
    • How to Use nChain Event
    • Initial Set-Up
  • πŸ”Independent Records
    • Introduction
    • Functional Description
      • Write Record
      • Read Record
      • Verify Record †
    • Use Cases
      • Lucky Number Tickets
      • Internet of Things (IoT) Data
      • Intellectual Property Rights (IPR) Evidence
      • Car Dealership
    • Tutorials
      • Data Integrity
      • Blockchain Unique Identifiers
    • API Workflow
      • Configure API
      • Write Record
      • Get Location Status
      • Read Record
      • Verify Record †
  • πŸ”—Linked Records Β§
    • Introduction
    • Functional Description
      • Create Link Record Β§
      • Read Link Record Β§
      • Update Link Record Β§
      • Delete Link Record Β§
      • Verify Link Record Β§ †
      • Navigate Linked Record Β§ ΒΆ
    • Use Cases
      • Luxury Handbag Provenance
      • Random Prize Draw
    • Tutorials
      • Collection Integrity
      • Provenance Integrity
    • API Workflow
      • Configure API
      • Create Link Record Β§
      • Get Link Location Status Β§
      • Read Link Record Β§
      • Update Link Record Β§
      • Delete Link Record Β§
      • Verify Link Record Β§ †
      • Navigate Link Record Β§ ΒΆ
  • βš™οΈAPI Documentation
    • nChain Event API
  • ⛓️Bitcoin SV Blockchain
    • Features and Benefits
    • Writing to Blockchain
    • Reading from Blockchain
    • Transaction Format
  • ⁉️Troubleshooting
    • Troubleshooting
    • Error Codes
    • Glossary
    • Contact Us
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  1. Bitcoin SV Blockchain

Reading from Blockchain

PreviousWriting to BlockchainNextTransaction Format
  • Not all blockchain nodes keep all records that are written to the blockchain. These nodes may return "not found" for records they have purged from their local data. Use a blockchain node that stores the records.

  • When GET location status provides a confirmation of your record being submitted to the blockchain, it supplies the Merkle proof:

    • This is a mathematical proof that your record was written to the blockchain at a particular place

    • According to this standard:

    • See the example in

    • Occasionally, the Merkle proof may change over an hour or so, if the blockchain "forks" – this is normal blockchain behaviour, however one prong of the fork will soon become dominant as consensus is restored

  • When your record has been confirmed on the blockchain for at least an hour, the Merkle proof will cease being liable to change and, depending on your use case, you can store it as definitive evidence of the blockchain operation.

  • You can read your written records from the blockchain at the returned location using a third-party tool. *

  • You can also verify your written records at the returned location using a third-party tool. You will need the original record. *

Note: * You will need to trim off the nChain Event metadata from the transaction output to obtain the record. You can try writing an unencoded test record such as "[test]" to identify where the record resides amongst the transaction output.

⛓️
Merkle Proof Standardised Format
GET location status