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3 Updated answer to include more recent information about the retirement of the alert key system. Changed some existing tense to past tense so that it makes better grammatical sense.
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No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" iswas the alerts system, which allowsallowed signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature iswas for alerts only and can in no way affect the blockchain, transactions, or user balances. This key iswas possessed by Satoshi, Gavin Andresen, and theymos.

Update: The alerts system was retired in the summer of 2018, due to risk of DOS attack vectors (full nodes could be DOS attacked by carefully crafted alert messages), and increasingly widespread knowledge of the alert keys.

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" is the alerts system, which allows signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature is for alerts only and can in no way affect the blockchain, transactions, or user balances. This key is possessed by Satoshi, Gavin Andresen, and theymos.

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" was the alerts system, which allowed signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature was for alerts only and can in no way affect the blockchain, transactions, or user balances. This key was possessed by Satoshi, Gavin Andresen, and theymos.

Update: The alerts system was retired in the summer of 2018, due to risk of DOS attack vectors (full nodes could be DOS attacked by carefully crafted alert messages), and increasingly widespread knowledge of the alert keys.

2 Fixed a typo in Gavin's name.
source | link

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" is the alerts system, which allows signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature is for alerts only and can in no way affect the blockchain, transactions, or user balances. This key is possessed by Satoshi, Gavin AndersonAndresen, and theymos.

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" is the alerts system, which allows signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature is for alerts only and can in no way affect the blockchain, transactions, or user balances. This key is possessed by Satoshi, Gavin Anderson, and theymos.

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" is the alerts system, which allows signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature is for alerts only and can in no way affect the blockchain, transactions, or user balances. This key is possessed by Satoshi, Gavin Andresen, and theymos.

1
source | link

No one holds a key that gives them special control of the blockchain.

The closest thing to a "master key" is the alerts system, which allows signed messages to be sent to every client, for example, to tell users to update their client in response to a security issue. This feature is for alerts only and can in no way affect the blockchain, transactions, or user balances. This key is possessed by Satoshi, Gavin Anderson, and theymos.