About PIN

PIN stands for Personal Information Node. Each piece of on-chain data that conforms to the MetaID format is called a PIN. These are issued by users through private key signatures, representing individual on-chain actions. Actions such as creating a MetaID, posting comments, liking, deploying, and minting assets are all represented by a PIN.

PINs use ordinal theory, with the PIN content loaded in the transaction output, typically at the first satoshi of its output. When a PIN is created, the first satoshi of the transaction output represents the PIN.

PIN Owners and Creators

Each PIN has two main attributes: owner and creator.

• Creator: The creator is the original address that generated the PIN. This attribute is determined by the transaction that creates the PIN and, once set, cannot be changed regardless of subsequent transactions.

• Owner: The owner is the current user address that holds the satoshi representing the PIN. This attribute can be changed by transferring the satoshi.

For example, if user address A creates a PIN, and the satoshi representing this

PIN is currently held by user address B, then A is the creator and B is the owner.

PINID

A PINID is composed of its transaction ID (TxId) and the output position (output index) within the transaction. The format is as follows:

PINID = {TxId}i{index}

The PINID is a globally unique identifier, marking a specific position within a specific transaction on the blockchain.

PIN Number

The PIN Number is a sequence number assigned to a PIN. It is ordered based on the sequence in which the PIN is packaged in the blockchain, following the first-seen principle.

Transfer

The PINs in MetaID exist in the form of satoshis, allowing the tracking and transfer of individual satoshis. The transfer follows a first-in-first-out method from the transaction input to the transaction output, depending on the order of transaction inputs and outputs.

As shown in the diagram, if the PIN is in position #1001 in all transaction inputs, it remains in position #1001 in all transaction outputs after the transfer.