Да.
Токен запроса связан только с потребителем (Mysite) до того момента, пока конкретный пользователь не авторизует его.
Токен доступа знает потребителя (Mysite) и пользователяэто применимо к.Парень, владеющий им, идентифицирует себя как Mysite и может выполнять действия от имени этого пользователя.
Вот как oauth-php реализует это: http://code.google.com/p/oauth-php/source/browse/trunk/library/store/mysql/mysql.sql
#
# ////////////////// SERVER SIDE /////////////////
#
# Table holding consumer key/secret combos an user issued to consumers.
# Used for verification of incoming requests.
CREATE TABLE IF NOT EXISTS oauth_server_registry (
osr_id int(11) not null auto_increment,
osr_usa_id_ref int(11),
osr_consumer_key varchar(64) binary not null,
osr_consumer_secret varchar(64) binary not null,
osr_enabled tinyint(1) not null default '1',
osr_status varchar(16) not null,
osr_requester_name varchar(64) not null,
osr_requester_email varchar(64) not null,
osr_callback_uri varchar(255) not null,
osr_application_uri varchar(255) not null,
osr_application_title varchar(80) not null,
osr_application_descr text not null,
osr_application_notes text not null,
osr_application_type varchar(20) not null,
osr_application_commercial tinyint(1) not null default '0',
osr_issue_date datetime not null,
osr_timestamp timestamp not null default current_timestamp,
primary key (osr_id),
unique key (osr_consumer_key),
key (osr_usa_id_ref)
# , foreign key (osr_usa_id_ref) references any_user_auth(usa_id_ref)
# on update cascade
# on delete set null
) engine=InnoDB default charset=utf8;
CREATE TABLE IF NOT EXISTS oauth_server_token (
ost_id int(11) not null auto_increment,
ost_osr_id_ref int(11) not null,
ost_usa_id_ref int(11) not null,
ost_token varchar(64) binary not null,
ost_token_secret varchar(64) binary not null,
ost_token_type enum('request','access'),
ost_authorized tinyint(1) not null default '0',
ost_referrer_host varchar(128) not null default '',
ost_token_ttl datetime not null default '9999-12-31',
ost_timestamp timestamp not null default current_timestamp,
ost_verifier char(10),
ost_callback_url varchar(512),
primary key (ost_id),
unique key (ost_token),
key (ost_osr_id_ref),
key (ost_token_ttl),
foreign key (ost_osr_id_ref) references oauth_server_registry (osr_id)
on update cascade
on delete cascade
# , foreign key (ost_usa_id_ref) references any_user_auth (usa_id_ref)
# on update cascade
# on delete cascade
) engine=InnoDB default charset=utf8;