Multisignature key custody, key customization, and privacy service

At least one non-transitory computer-readable medium with instructions encoded thereon, the instructions, when executed by one or more processors, causing the one or more processors to:

• transmit an update to a smart contract to associate a role with a key, the key associated with a multisignature wallet;
• receive a request to initiate a transaction, the transaction effected based on whether a given key having the role signs the transaction;
• and
• receive, from the smart contract, an indication of whether the transaction is effected in a manner corresponding to the role, wherein:
• the role corresponds to a recovery function;
• the transaction is a challenge transaction of a first key for replacement by a second key;
• the first key is replaced based on a monitoring, during a length of time, for a message signed using the first key;
• responsive to detecting a signature by the first key during the length of time, the challenge transaction is blocked;
• responsive to determining that the length of time has elapsed without detecting the signature, the first key is replaced with the second key;
• the length of time is reduced responsive to at least one of one or more additional keys signing the challenge transaction;
• and
• public addresses of the one or more additional keys are associated with the smart contract.

A system comprising at least one computer-readable medium with instructions encoded thereon, and one or more processors that, when executing the instructions, perform operations comprising:

• transmitting an update to a smart contract to associate a role with a key, the key associated with a multisignature wallet;
• receiving a request to initiate a transaction, the transaction effected based on whether a given key having the role signs the transaction;
• and
• receiving, from the smart contract, an indication of whether the transaction is effected in a manner corresponding to the role, wherein:
• the role corresponds to a recovery function;
• the transaction is a challenge transaction of a first key for replacement by a second key;
• the first key is replaced based on a monitoring, during a length of time, for a message signed using the first key;
• responsive to detecting a signature by the first key during the length of time, the challenge transaction is blocked;
• responsive to determining that the length of time has elapsed without detecting the signature, the first key is replaced with the second key;
• the length of time is reduced responsive to at least one of one or more additional keys signing the challenge transaction;
• and
• public addresses of the one or more additional keys are associated with the smart contract.